Al-Mg-Si-In合金的热变形行为和热轧工艺  

Hot Deformation Behavior and Hot-rolling Process of Al-Mg-Si-In Alloy

作　　者：苏粤兰 罗兵辉[1] 柏振海[1] 莫文锋 何川 SU Yuelan;LUO Binghui;BAI Zhenhai;MO Wenfeng;HE Chuan(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《材料导报》2021年第20期20137-20142,共6页Materials Reports

基　　金：中国国防科技工业局项目(2011-006)。

摘　　要：采用Gleeble-3500型热模拟试验机对Al-Mg-Si-In合金进行热压缩实验,温度范围为350~500℃,应变速率范围为0.001~1 s^(-1),分析变形温度、变形速率对该合金热变形过程中流变应力的影响,并建立了合金的本构方程和热加工图,结合金相显微镜对热压缩变形的组织进行研究。测试结果表明:随着变形温度的降低或应变速率的加快,流变应力和峰值应力升高,合金的动态软化机制以动态回复为主,难以发生动态再结晶;合金的热压缩变形流变应力行为可用双曲正弦形式的本构方程来描述,其变形激活能为180.84 kJ/mol;在应变为0.2时,该合金的合适加工区域是470~500℃、0.001~0.01 s^(-1)和350~375℃、0.1~1 s^(-1),失稳区是350~360℃、0.001~0.01 s^(-1);在应变为0.8时,该合金的合适加工区域是350~360℃、0.1~1 s^(-1),390~480℃、0.001~0.01 s^(-1),480~500℃、0.1~1 s^(-1),失稳区是350~360℃、0.001~0.01 s^(-1),490~500℃、0.001~0.01 s^(-1),390~425℃、0.1~1 s^(-1)。该合金在应变为0.8时的合适加工区域的等轴晶粒较多,且晶粒较细小,失稳区域则反之。实际加工的热轧工艺制度为480℃、0.51 s^(-1),轧制效果良好。Al-Mg-Si-In alloy was subjected to thermal compression experiment using Gleeble-3500 thermal simulation testing machine,the temperature range was 350—500℃,and the strain rate range was 0.001—1 s^(-1).The effects of deformation temperature and deformation rate on rheological stress during thermal deformation of the alloy were analyzed,and the constitutive equation and thermal processing diagram of the alloy were established.The microstructure of thermal compression deformation was studied with metallographic microscope.The test results show that with the decrease of deformation temperature or the increase of strain rate,the flow stress and peak stress increase,and the dynamic softening mechanism of the alloy is mainly dynamic recovery,which is difficult to occur dynamic recrystallization.The thermal compression deformation rheological stress behavior of the alloy can be described by a hyperbolic sine constitutive equation,and its deformation activation energy is 180.84 kJ/mol.When the strain is 0.2,the suitable processing area of the alloy is 470—500℃,0.001—0.01 s^(-1)and 350—375℃,0.1—1 s^(-1),instability region is 350—360℃,0.001—0.01 s^(-1).When the strain is 0.8,the suitable processing area of the alloy is 350—360℃,0.1—1 s^(-1);390—480℃,0.001—0.01 s^(-1);480—500℃,0.1—1 s^(-1).The instability region is 350—360℃,0.001—0.01 s^(-1);490—500℃,0.001—0.01 s^(-1);390—425℃,0.1~1 s^(-1).When the strain of the alloy is 0.8,there are more equiaxed grains in the suitable processing region,and the grains are smaller,while the unstable region is opposite.The effect of actual hot-rolling process 480℃,0.51 s^(-1),and the rolling effect is well.

关 键 词：Al-Mg-Si-In合金 本构方程 热加工图 热轧工艺 

分 类 号：TG146.2[一般工业技术—材料科学与工程]