Annealing thiab quenching thiab aging yog cov txheej txheem kev kho cua sov ntawm aluminium alloys. Annealing yog ib qho kev kho mob softening, lub hom phiaj yog ua kom cov hlau tsis sib xws thiab ruaj khov nyob rau hauv muaj pes tsawg leeg thiab cov qauv, tshem tawm ua hauj lwm hardening, thiab restore lub plasticity ntawm alloy. Quenching thiab aging yog ib qho kev kho cua sov kom muaj zog, lub hom phiaj yog los txhim kho lub zog ntawm cov hlau, thiab feem ntau yog siv rau aluminium alloys uas tuaj yeem ua kom muaj zog los ntawm kev kho cua sov.
1 Annealing
Raws li kev tsim khoom sib txawv, aluminium alloy annealing tau muab faib ua ntau hom: ingot homogenization annealing, billet annealing, intermediate annealing thiab tiav cov khoom annealing.
1.1 Ingot homogenization annealing
Nyob rau hauv tej yam kev mob ntawm ceev ceev condensation thiab tsis-equilibrium crystallization, lub ingot yuav tsum muaj ib tug tsis sib xws muaj pes tsawg leeg thiab cov qauv, thiab kuj muaj kev ntxhov siab nyob rau hauv. Txhawm rau hloov qhov xwm txheej no thiab txhim kho cov txheej txheem ua haujlwm kub ntawm lub ingot, homogenization annealing feem ntau yuav tsum tau ua.
Txhawm rau txhawb atomic diffusion, qhov kub siab dua yuav tsum raug xaiv rau homogenization annealing, tab sis nws yuav tsum tsis txhob tshaj qhov qis melting point eutectic melting point ntawm cov hlau. Feem ntau, homogenization annealing kub yog 5 ~ 40 ℃ qis dua lub melting point, thiab lub sij hawm annealing yog feem ntau ntawm 12 ~ 24h.
1.2 Cov khoom siv hluav taws xob
Billet annealing yog hais txog qhov annealing ua ntej thawj qhov txias deformation thaum lub sij hawm ua haujlwm siab. Lub hom phiaj yog ua kom cov billet tau txais cov qauv sib npaug thiab muaj qhov siab tshaj plaws ntawm cov yas deformation. Piv txwv li, qhov kub ntawm qhov kub dov aluminium alloy slab yog 280 ~ 330 ℃. Tom qab txias txias ntawm chav tsev kub, qhov ua haujlwm hardening tshwm sim tsis tuaj yeem raug tshem tawm tag nrho. Tshwj xeeb, rau kev kho cua sov ua kom muaj zog aluminium alloys, tom qab txias ceev, cov txheej txheem recrystallization tsis tas, thiab cov tshuaj supersaturated tsis tau decomposed kiag li, thiab ib feem ntawm kev ua hauj lwm hardening thiab quenching nyhuv tseem khaws cia. Nws yog qhov nyuaj rau txias yob ncaj qha yam tsis muaj annealing, yog li yuav tsum tau billet annealing. Rau cov uas tsis yog-kub-kho muaj zog aluminium alloys, xws li LF3, lub annealing kub yog 370 ~ 470 ℃, thiab cua txias yog ua tom qab ua kom sov rau 1.5 ~ 2.5h. Lub billet thiab annealing kub siv rau txias-draw tube ua yuav tsum tsim nyog siab dua, thiab sab sauv txwv kub yuav xaiv tau. Rau aluminium alloys uas tuaj yeem ua kom muaj zog los ntawm kev kho cua sov, xws li LY11 thiab LY12, qhov kub ntawm qhov cub yog 390 ~ 450 ℃, khaws cia ntawm qhov kub no rau 1 ~ 3h, tom qab ntawd txias hauv qhov cub kom qis dua 270 ℃ ntawm tus nqi tsis tshaj 30 ℃ / h thiab tom qab ntawd cua txias tawm ntawm qhov cub.
1.3 Intermediate annealing
Intermediate annealing yog hais txog annealing ntawm cov txheej txheem txias deformation, lub hom phiaj ntawm kev tshem tawm kev ua haujlwm hardening los pab txhawb qhov txias deformation. Feem ntau hais lus, tom qab cov khoom tau raug annealed, nws yuav nyuaj rau kev ua haujlwm txias ntxiv yam tsis muaj qhov nruab nrab annealing tom qab 45 ~ 85% txias deformation.
Cov txheej txheem ntawm nruab nrab annealing yog qhov pib zoo ib yam li ntawm billet annealing. Raws li qhov yuav tsum tau ua ntawm txias deformation degree, intermediate annealing yuav muab faib ua peb hom: ua kom tiav annealing (tag nrho deformation ε≈60 ~ 70%), yooj yim annealing (ε≤50%) thiab me ntsis annealing (ε≈30 ~ 40%). Thawj ob lub tshuab annealing yog tib yam li billet annealing, thiab tom kawg yog rhuab ntawm 320 ~ 350 ℃ rau 1.5 ~ 2h thiab tom qab ntawd cua txias.
1.4. Cov khoom tiav annealing
Cov khoom tiav tiav annealing yog qhov kawg kev kho cua sov uas muab cov khoom siv rau qee lub koom haum thiab cov khoom siv kho tshuab raws li qhov yuav tsum tau ua ntawm cov khoom siv khoom.
Cov khoom tiav annealing tuaj yeem muab faib ua qhov kub siab annealing (tsim cov khoom muag muag) thiab qis kub annealing (tsim cov khoom ib nrab ntawm cov khoom nyuaj hauv ntau lub xeev). Kub kub annealing yuav tsum xyuas kom meej tias cov qauv recrystallization tiav thiab cov yas zoo tuaj yeem tau txais. Raws li kev ua kom ntseeg tau tias cov khoom tau txais cov qauv zoo thiab kev ua haujlwm zoo, lub sijhawm tuav yuav tsum tsis txhob ntev dhau. Rau aluminium alloys uas tuaj yeem ua kom muaj zog los ntawm kev kho cua sov, txhawm rau tiv thaiv cov cua txias quenching nyhuv, qhov cua txias yuav tsum tau tswj nruj me ntsis.
Tsis tshua muaj kub annealing suav nrog kev ntxhov siab annealing thiab ib nrab softening annealing, uas yog tsuas yog siv rau cov ntshiab txhuas thiab tsis-kub kev kho mob ntxiv dag zog rau aluminium alloys. Kev tsim cov txheej txheem kub tsis tshua muaj siab yog ib txoj haujlwm nyuaj, uas tsis tsuas yog yuav tsum xav txog qhov ntsuas kub thiab tuav lub sijhawm, tab sis kuj yuav tsum xav txog kev cuam tshuam ntawm impurities, alloying degree, txias deformation, intermediate annealing kub thiab kub deformation kub. Txhawm rau tsim qhov ntsuas kub qis, nws yog qhov yuav tsum tau ntsuas qhov kev hloov pauv ntawm qhov ntsuas kub thiab cov khoom siv tshuab, thiab tom qab ntawd txiav txim siab qhov ntsuas kub ntawm qhov ntsuas kub raws li cov ntsuas kev ua haujlwm tau teev tseg hauv cov txheej txheem.
2 Quenching
Lub quenching ntawm aluminium alloy kuj yog hu ua kev kho mob, uas yog kom yaj ntau npaum li cas alloying ntsiab nyob rau hauv cov hlau raws li ib tug thib ob theem mus rau hauv cov khoom tov raws li tau los ntawm high-temperature cua sov, ua raws li los ntawm ceev txias kom inhibit lub nag los ntawm lub thib ob theem, yog li tau txais ib tug supersaturated aluminium-based α cov tshuaj tov, uas yog npaj zoo rau kev laus tom ntej.
Lub hauv paus ntsiab lus ntawm kev tau txais cov tshuaj supersaturated α yog qhov kev daws teeb meem ntawm theem thib ob hauv cov hlau alloy hauv txhuas yuav tsum tau nce siab nrog qhov nce ntawm qhov kub thiab txias, txwv tsis pub, lub hom phiaj ntawm cov khoom siv tshuaj kho tsis tuaj yeem ua tiav. Feem ntau cov ntsiab lus alloying nyob rau hauv txhuas tuaj yeem tsim daim duab eutectic theem nrog cov yam ntxwv no. Siv Al-Cu alloy ua piv txwv, qhov kub ntawm eutectic yog 548 ℃, thiab chav sov solubility ntawm tooj liab hauv txhuas yog tsawg dua 0.1%. Thaum rhuab mus rau 548 ℃, nws solubility nce mus rau 5.6%. Yog li ntawd, Al-Cu alloys uas muaj tsawg tshaj li 5.6% tooj liab nkag mus rau α ib theem cheeb tsam tom qab lub cua sov kub tshaj nws cov solvus kab, uas yog, lub thib ob theem CuAl2 yog kiag li yaj nyob rau hauv lub matrix, thiab ib tug supersaturated α cov tshuaj tov tau tom qab quenching.
quenching yog qhov tseem ceeb tshaj plaws thiab xav tau kev kho cua sov ua haujlwm rau aluminium alloys. Qhov tseem ceeb yog xaiv qhov tsim nyog quenching cua sov kub thiab xyuas kom txaus quenching txias tus nqi, thiab nruj me ntsis tswj lub cub tawg kub thiab txo quenching deformation.
Lub hauv paus ntsiab lus ntawm kev xaiv lub quenching kub yog ua kom lub quenching cua kub kom ntau li ntau tau thaum xyuas kom meej tias cov aluminium alloy tsis overburn los yog cov nplej loj hlob ntau heev, thiaj li yuav ua rau kom lub supersaturation ntawm α cov tshuaj tov thiab lub zog tom qab kev laus kho. Feem ntau, aluminium alloy cua sov rauv yuav tsum tau lub cub tawg kub tswj qhov tseeb kom nyob rau hauv ± 3 ℃, thiab huab cua nyob rau hauv lub cub tawg yog yuam kom circulate kom lub uniformity ntawm lub cub tawg kub.
Overburning ntawm aluminium alloy yog tshwm sim los ntawm ib nrab melting ntawm tsawg-melting-point Cheebtsam nyob rau hauv cov hlau, xws li binary los yog multi-element eutectics. Kev kub nyhiab tsis tsuas yog ua rau txo qis ntawm cov khoom siv kho tshuab, tab sis kuj tseem muaj kev cuam tshuam loj heev rau kev tiv thaiv corrosion ntawm alloy. Yog li ntawd, ib zaug aluminium alloy overburned, nws tsis tuaj yeem raug tshem tawm thiab cov khoom siv hlau yuav tsum tau muab pov tseg. Qhov tseeb overburning kub ntawm aluminium alloy yog tsuas yog txiav txim siab los ntawm cov alloy muaj pes tsawg leeg thiab impurity cov ntsiab lus, thiab kuj muaj feem xyuam rau lub alloy ua lub xeev. Lub overburning kub ntawm cov khoom uas tau undergone yas deformation ua yog siab tshaj ntawm cov castings. Qhov ntau dua qhov kev ua deformation, qhov yooj yim dua yog rau cov khoom tsis sib npaug ntawm qhov sib npaug ntawm cov ntsiab lus me me kom yaj rau hauv matrix thaum rhuab, yog li qhov tseeb overburning kub nce.
Cov cua txias thaum lub sij hawm quenching ntawm aluminium alloy muaj qhov cuam tshuam loj rau kev laus zog ntxiv dag zog thiab corrosion kuj ntawm cov hlau. Thaum lub sij hawm quenching txheej txheem ntawm LY12 thiab LC4, nws yog ib qhov tsim nyog los xyuas kom meej tias cov α cov tshuaj tsis decompose, tshwj xeeb tshaj yog nyob rau hauv lub kub rhiab heev cheeb tsam ntawm 290 ~ 420 ℃, thiab ib tug txaus txias txias yuav tsum tau. Nws feem ntau tau teev tseg tias qhov cua txias yuav tsum siab tshaj 50 ℃ / s, thiab rau LC4 alloy, nws yuav tsum ncav cuag lossis tshaj 170 ℃ / s.
Qhov feem ntau siv quenching nruab nrab rau aluminium alloys yog dej. Kev xyaum ntau lawm qhia tau hais tias qhov ntau dua qhov txias txias thaum lub sij hawm quenching, qhov ntau dua qhov residual stress thiab residual deformation ntawm quenched khoom los yog workpiece. Yog li ntawd, rau cov khoom me me nrog cov duab yooj yim, cov dej kub tuaj yeem qis dua me ntsis, feem ntau 10 ~ 30 ℃, thiab yuav tsum tsis pub tshaj 40 ℃. Rau workpieces nrog complex duab thiab loj sib txawv ntawm phab ntsa thickness, thiaj li yuav txo tau quenching deformation thiab cracking, dej kub tej zaum yuav nce mus txog 80 ℃. Txawm li cas los xij, nws yuav tsum tau taw qhia tias thaum dej kub ntawm lub tank quenching nce, lub zog thiab corrosion kuj ntawm cov khoom kuj txo raws li.
3. Kev laus
3.1 Kev hloov pauv thiab kev ua haujlwm hloov pauv thaum laus
Lub supersaturated α cov kua tshuaj tau los ntawm quenching yog cov qauv tsis ruaj khov. Thaum rhuab, nws yuav decompose thiab hloov mus rau hauv ib tug equilibrium qauv. Siv Al-4Cu alloy ua piv txwv, nws cov qauv sib npaug yuav tsum yog α + CuAl2 (θ theem). Thaum ib-theem supersaturated α cov tshuaj tov tom qab quenching yog rhuab rau kev laus, yog tias qhov kub thiab txias txaus, lub θ theem yuav precipitated ncaj qha. Txwv tsis pub, nws yuav raug coj mus rau theem, uas yog, tom qab qee qhov kev hloov pauv nruab nrab, qhov kawg theem sib npaug CuAl2 tuaj yeem ncav cuag. Daim duab hauv qab no qhia txog cov qauv siv lead ua tus yam ntxwv ntawm txhua theem nag lossis daus thaum lub sijhawm kev laus ntawm Al-Cu alloy. Daim duab a. yog cov qauv siv lead ua lattice nyob rau hauv lub xeev quenched. Nyob rau lub sijhawm no, nws yog ib theem α supersaturated solid tov, thiab tooj liab atoms (dub dots) yog sib npaug thiab randomly faib rau hauv txhuas (dawb dots) matrix lattice. Daim duab b. qhia cov qauv lattice nyob rau hauv thaum ntxov theem ntawm nag lossis daus. Copper atoms pib mloog zoo rau qee qhov chaw ntawm matrix lattice los tsim ib cheeb tsam Guinier-Preston, hu ua GP cheeb tsam. GP cheeb tsam yog me me thiab disc-zoo li tus, nrog ib txoj kab uas hla ntawm 5 ~ 10μm thiab ib tug tuab ntawm 0.4 ~ 0.6nm. Tus naj npawb ntawm GP zones hauv matrix yog qhov loj heev, thiab qhov sib faib ceev tuaj yeem ncav cuag 10¹⁷ ~ 10¹⁸cm-³ . Cov qauv siv lead ua ntawm thaj chaw GP tseem yog tib yam li cov matrix, ob qho tib si yog lub ntsej muag-centered cubic, thiab nws tuav ib coherent interface nrog cov matrix. Txawm li cas los xij, vim tias qhov loj ntawm tooj liab atoms me dua li ntawm aluminium atoms, qhov kev nplua nuj ntawm tooj liab atoms yuav ua rau cov iav siv lead ua nyob ze rau thaj tsam kom txo qis, uas ua rau lattice distortion.
Schematic daim duab ntawm cov qauv siv lead ua hloov ntawm Al-Cu alloy thaum laus
Daim duab a. Quenched lub xeev, ib theem α cov tshuaj tov, tooj liab atoms (dub dots) yog sib npaug;
Daim duab b. Thaum ntxov ntawm kev laus, thaj tsam GP yog tsim;
Daim duab c. Nyob rau hauv lub lig theem ntawm kev laus, ib tug semi-coherent hloov theem yog tsim;
Daim duab d. Kub kub aging, nag lossis daus ntawm incoherent equilibrium theem
GP cheeb tsam yog thawj cov khoom ua ntej nag lossis daus uas tshwm sim thaum lub sij hawm kev laus ntawm aluminium alloys. Nthuav lub sij hawm laus, tshwj xeeb tshaj yog nce qhov kub ntawm kev laus, tseem yuav tsim lwm qhov kev hloov pauv nruab nrab. Nyob rau hauv lub Al-4Cu alloy, muaj θ "thiab θ' theem tom qab GP cheeb tsam, thiab thaum kawg lub equilibrium theem CuAl2 yog mus txog. θ "thiab θ' yog ob qho tib si hloov theem ntawm θ theem, thiab cov siv lead ua qauv yog ib tug square lattice, tab sis lub lattice tas li yog txawv. Qhov loj ntawm θ yog loj dua li ntawm thaj tsam GP, tseem disc-zoo li tus, nrog ib txoj kab uas hla ntawm 15 ~ 40nm thiab ib lub thickness ntawm 0.8 ~ 2.0nm. Nws tseem ua kom muaj kev sib raug zoo nrog cov matrix, tab sis qhov degree ntawm lattice distortion yog khaus. Thaum hloov los ntawm θ" mus rau θ' theem, qhov loj tau loj hlob mus rau 20 ~ 600nm, lub thickness yog 10 ~ 15nm, thiab cov coherent interface kuj yog ib feem puas, ua ib tug semi-coherent interface, raws li qhia nyob rau hauv daim duab c. Cov khoom kawg ntawm kev laus nag lossis daus yog lub sij hawm sib npaug ntawm qhov sib npaug ntawm θ, uas yog qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm θ θ. ua ib qho kev sib txuas tsis sib xws, raws li pom hauv daim duab d.
Raws li cov xwm txheej saum toj no, kev laus los nag ntawm Al-Cu alloy yog αs → α + GP zone → α + θ "→ α + θ" → α + θ.
Thaum lub sij hawm kev laus, GP cheeb tsam thiab kev hloov pauv theem precipitated los ntawm matrix yog me me, dispersed heev, thiab tsis yooj yim deformed. Nyob rau tib lub sij hawm, lawv ua rau lattice distortion nyob rau hauv lub matrix thiab tsim ib tug kev nyuaj siab teb, uas muaj ib tug tseem ceeb cuam tshuam rau lub zog ntawm dislocations, yog li ua rau kom cov yas deformation ntawm lub alloy thiab txhim kho nws lub zog thiab hardness. Qhov no aging hardening tshwm sim yog hu ua nag lossis daus hardening. Daim duab hauv qab no qhia txog qhov nyuaj ntawm kev hloov pauv ntawm Al-4Cu alloy thaum lub sij hawm quenching thiab aging kho nyob rau hauv daim ntawv ntawm ib tug nkhaus. Theem I nyob rau hauv daim duab sawv cev rau lub hardness ntawm lub alloy nyob rau hauv nws thawj lub xeev. Vim muaj cov keeb kwm ua haujlwm kub sib txawv, qhov nyuaj ntawm lub xeev qub yuav txawv, feem ntau HV = 30 ~ 80. Tom qab cua sov ntawm 500 ℃ thiab quenching (theem II), tag nrho cov tooj liab atoms yog yaj mus rau hauv lub matrix los ua ib tug ib-theem supersaturated α cov tshuaj tov nrog HV = 60, uas yog ob zaug raws li lub hardness nyob rau hauv lub annealed xeev (HV = 30). Qhov no yog qhov tshwm sim ntawm kev daws teeb meem ntxiv dag zog. Tom qab quenching, nws yog muab tso rau hauv chav tsev kub, thiab lub hardness ntawm lub alloy yog tsis tu ncua nce vim lub nruam tsim ntawm GP zones (theem III). Cov txheej txheem aging hardening ntawm chav tsev kub yog hu ua natural aging.
Kuv - thawj lub xeev;
II-solid lub xeev;
III-natural aging (GP zone);
IVa-regression kho ntawm 150 ~ 200 ℃ (redissolved hauv GP cheeb tsam);
IVb-kev laus kev laus (θ "+ θ' theem);
V-overaging (θ "+ θ' theem)
Nyob rau theem IV, cov hlau yog rhuab mus rau 150 ° C rau kev laus, thiab cov nyhuv hardening yog pom tseeb dua li ntawm ntuj aging. Nyob rau lub sijhawm no, cov khoom nag lossis daus feem ntau yog θ "theem, uas muaj cov txiaj ntsig zoo tshaj plaws hauv Al-Cu alloys. Yog tias qhov kub thiab txias ntxiv, cov nag lossis daus hloov los ntawm theem θ" mus rau θ 'theem, cov nyhuv hardening tsis muaj zog, thiab cov hardness txo qis, nkag mus rau theem V. Txhua yam kev laus uas yuav tsum tau ua kom muaj cua sov thiab V. Yog hais tias lub hardness ncav cuag qhov siab tshaj plaws hardness tus nqi uas cov hlau tuaj yeem ncav cuag tom qab kev laus (piv txwv li, theem IVb), qhov kev laus no yog hu ua kev laus. Yog hais tias qhov siab tshaj hardness tus nqi tsis tau mus txog, nws yog hu ua under-aging los yog tsis tiav kev laus dag. Yog tias tus nqi siab tshaj yog hla thiab qhov hardness txo qis, nws yog hu ua over-aging. Stabilization aging kev kho mob kuj belongs rau over-aging. GP cheeb tsam tsim thaum lub sij hawm ntuj tsim yog heev unstable. Thaum tshav kub kub sai rau qhov kub siab dua, xws li txog 200 ° C, thiab khaws cia kom sov rau lub sijhawm luv luv, GP cheeb tsam yuav yaj rov qab rau hauv cov tshuaj α. Yog tias nws txias sai heev (quenched) ua ntej lwm qhov kev hloov pauv xws li θ" lossis θ 'precipitate, cov hlau tuaj yeem rov qab los rau nws qhov qub quenched lub xeev, qhov tshwm sim no hu ua "regression", uas yog lub hardness poob qhia los ntawm cov kab dotted nyob rau hauv theem IVa hauv daim duab.
Lub hnub nyoog hardening yog lub hauv paus rau kev tsim kho cua sov-kho aluminium alloys, thiab nws lub hnub nyoog hardening muaj peev xwm ncaj qha ntsig txog cov alloy muaj pes tsawg leeg thiab kev kho cua sov. Al-Si thiab Al-Mn binary alloys tsis muaj nag lossis daus hnyav vim tias cov theem sib npaug yog ncaj qha los nag thaum lub sijhawm laus, thiab yog cov hlau tsis muaj cua sov-kho tau txhuas. Txawm hais tias Al-Mg alloys tuaj yeem tsim GP aav thiab hloov pauv theem β', lawv tsuas muaj qee qhov nag lossis daus hardening peev xwm hauv high-magnesium alloys. Al-Cu, Al-Cu-Mg, Al-Mg-Si thiab Al-Zn-Mg-Cu alloys muaj zog nag lossis daus hardening muaj peev xwm nyob rau hauv lawv cov GP aav thiab hloov theem, thiab tam sim no yog lub ntsiab alloy systems uas yuav tsum tau tshav kub-kho thiab ntxiv dag zog rau.
3.2 Natural Aging
Feem ntau, aluminium alloys uas tuaj yeem ua kom muaj zog los ntawm kev kho cua sov muaj cov nyhuv laus tom qab quenching. Natural aging strengthening yog tshwm sim los ntawm GP cheeb tsam. Ntuj aging yog dav siv nyob rau hauv Al-Cu thiab Al-Cu-Mg alloys. Lub ntuj aging ntawm Al-Zn-Mg-Cu alloys kav ntev heev, thiab nws feem ntau siv ob peb lub hlis kom mus txog rau theem ruaj khov, yog li cov txheej txheem kev laus tsis siv.
Piv nrog rau kev laus kev laus, tom qab kev laus laus, lub zog ntawm cov hlau yog qis dua, tab sis cov plasticity thiab toughness zoo dua, thiab corrosion kuj siab dua. Qhov xwm txheej ntawm super-hard aluminium ntawm Al-Zn-Mg-Cu system yog txawv me ntsis. Kev tiv thaiv corrosion tom qab kev laus laus yog feem ntau zoo dua li tom qab kev laus laus.
3.3 Artificial laus
Tom qab kev kho kev laus laus, aluminium alloys feem ntau tuaj yeem tau txais lub zog siab tshaj plaws (feem ntau hloov pauv ntxiv zog) thiab kev ruaj ntseg zoo dua. Super-hard aluminium, forged aluminium thiab cam khwb cia txhuas feem ntau yog cov hnub nyoog. Kev laus kub thiab lub sijhawm laus muaj qhov cuam tshuam tseem ceeb ntawm cov khoom siv hlau. Kev laus kub yog feem ntau ntawm 120 ~ 190 ℃, thiab lub sijhawm laus tsis tshaj 24 teev.
Ntxiv nrog rau kev laus ib-theem kev laus, aluminium alloys kuj tuaj yeem txais cov txheej txheem kev laus. Ntawd yog, cua sov ua ob zaug lossis ntau dua ntawm qhov kub sib txawv. Piv txwv li, LC4 alloy tuaj yeem muaj hnub nyoog ntawm 115 ~ 125 ℃ rau 2 ~ 4h thiab tom qab ntawd ntawm 160 ~ 170 ℃ rau 3 ~ 5h. Kev laus zuj zus tuaj yeem tsis tsuas yog txo lub sijhawm, tab sis kuj tseem txhim kho microstructure ntawm Al-Zn-Mg thiab Al-Zn-Mg-Cu alloys, thiab txhim kho kev ntxhov siab corrosion kuj, qaug zog thiab tawg toughness yam tsis tau txo qis cov khoom siv dag zog.
Post lub sij hawm: Mar-06-2025
