塑性變形對(duì)鑄態(tài)az80鎂合金組織及性能影響的研究

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1、塑性變形對(duì)鑄態(tài)AZaO鎂合金組織及性能影響的研究摘要為了能提供一些實(shí)踐生產(chǎn)中鎂合金成型工藝基礎(chǔ)理論，本文以鑄態(tài)和均勻態(tài)AZ80鎂合金為研究對(duì)象，通過(guò)擠壓試驗(yàn)來(lái)研究塑性變形對(duì)鑄態(tài)AZ80鎂合金其組織性能的影響，并分析鑄態(tài)與均勻態(tài)成型過(guò)程中的差別。首先把部分坯料進(jìn)行均勻化退火處理，形成了均勻態(tài)試樣，在確定擠壓工藝后，對(duì)鑄態(tài)和均勻態(tài)AZ80鎂合金進(jìn)行擠壓試驗(yàn)。通過(guò)金相觀察、室溫力學(xué)性能測(cè)試等方法研究擠壓后的鑄型擠壓態(tài)和均勻型擠壓態(tài)的試樣，得到試樣組織性能的變化規(guī)律。如下：擠壓態(tài)試樣的微觀組織中均發(fā)生了動(dòng)態(tài)再結(jié)晶，在擠壓平行流線上分布著大量細(xì)小等軸晶，晶粒組織較擠壓前都明顯

2、產(chǎn)生了細(xì)化。從試驗(yàn)數(shù)據(jù)中，可以認(rèn)為隨擠壓溫度的升高，均勻型擠壓態(tài)的抗拉強(qiáng)度呈階段性變化，延伸率呈減小的趨勢(shì)，鑄型擠壓態(tài)抗拉強(qiáng)度和延伸率先降低后升高；通過(guò)比較，在同等條件下均勻型擠壓態(tài)抗拉強(qiáng)度高于鑄型擠壓態(tài)的，而且延伸率呈現(xiàn)較好的規(guī)律性。在試驗(yàn)中，鑄態(tài)AZ80鎂合金在T=390℃，擠壓比入=75擠壓時(shí)，室溫力學(xué)性能較好，所需的擠壓力相對(duì)較??；經(jīng)過(guò)均勻化處理的AZ80鎂合金在T=390℃，擠壓比入=60擠壓時(shí)，室溫性能較好，所需的擠壓力相對(duì)較小。關(guān)鍵詞：AZ80鎂合金，動(dòng)態(tài)再結(jié)晶，擠壓，微觀組織，力學(xué)性能TheEffectofPlasticDeformationofCa

3、stMagnesiumAlloyAZ80onitsMicrostructureandPerformanceAbstractInordertoprovidesomebasistheoriesaboutpracticalprocessofmagnesiumalloyproduction，thehomogeneous-statecastAZ80magnesiumalloywasstudiedbymeansofextrusiontrials，tostudytheeffectofplasticdeformationofcastmagnesiumalloyAZ80onitsmi

4、crostructuresandperformance，andeventhedifferencesintheprocessofforming．Firstofall，partsofthebilletswerehomogeneousannealedtoformthehomogeneous-statespecimens．Afterdeterminedparametersoftheextrusionprocess，theextrusiontestofthehomogeneous—statecastmagnesiumalloyAZ80werecarriedout．Bythet

5、estingmethodsofmetallographicobservationandtestsofthemechanicalperformanceatroomtemperatureandSOon，weresearchedthespecimensthatofextrudedcasteandhomogeneous-statecaste，SOwecanseethechangeorderlinessofthemicrostructuresandperformance．Asfollows：Dynamicrecrystallizationhadtookplaceinallth

6、eextrudedsamples．thereisalargenumberofsmallequiaxedgrainsintheparallelflowlines，andthegrainswerethinnerthanthatbeforeextrudedobviously．Fromtheexperimentaldata，wecanthinkofthatthebestrangeoftemperatureonrecrystallizationoftheAZ80magnesiumalloywasabout390。C；withtheriseoftheextrusiontempe

7、rature，thetensilestrengthoftheextrudedhomogeneous-statesimpleswasphasedchanges，andtheelongationwasreduced，thetrendoftensilestrengthandtheelongationarebothreducedafterthefirstrise；bycomparison，inthesameconditions，thetensilestrengthoftheextrudedhomogeneous-statesimplesarehigherthanthat