AZ61镁合金的热压缩变形行为及组织演变
Deformation Behavior and Microstructure Evolution of AZ61 Magnesium Alloy during Hot Compression
摘 要
采用Gleeble-1500型热模拟试验机对AZ61镁合金在变形温度为250~400 ℃、应变速率为0.001~10 s-1的条件下进行热压缩模拟试验, 研究了合金的热压缩变形行为和组织演变。结果表明: AZ61合金在热压缩变形过程中的流变行为可用Arrhenius关系曲线来表示, 合金的应力指数为5.096, 热变形激活能为147.262 kJ·mol-1; 在相同的变形温度下, 合金的再结晶程度随应变速率的增加而增大; 在低应变速率(0.001~1 s-1)下变形时, 再结晶主要发生在初始晶界上,在高应变速率(10 s-1)下变形时, 再结晶同时在初始晶界和孪晶上发生; 在相同的应变速率下, 再结晶程度和再结晶晶粒尺寸均随变形温度的升高而增大。
热压缩变形
本构方程
显微组织
动态再结晶
AZ61 magnesium alloy
hot compression deformation
constitutive equation
microstructure
dynamic recrystallization
Abstract
Hot compression of AZ61 magnesium alloy was conducted on Gleeble-1500 thermal compression tester at 250-400 ℃ in the strain rate range of 0.001-10 s-1, and the hot compression deformation behavior and microstructure evolution were investigated. The results show that the flow behavior of AZ61 alloy during hot compression could be described by Arrhenius relation. The hot deformation activation energy and stress exponent were 147.262 kJ·mol-1 and 5.096, respectively. The dynamic recrystallization (DRX) extent increased with strain rate increasing at the same compression temperature. DRX developed mainly at grain boundaries at the lower strain rate of 0.001-1 s-1, and DRX developed extensively at grain boundaries and twins at the higher strain rate of 10 s-1. The DRX extent and the average grain size of DRX grains both increased with deformation temperature increasing at the same strain rate.
中图分类号 TG146
所属栏目 试验研究
基金项目 湖南省教育厅科学技术研究项目(11C0572)
收稿日期 2013/6/27
修改稿日期 2014/5/5
网络出版日期
作者单位点击查看
备注张蓉(1967-), 女, 湖南衡阳人, 副教授, 硕士。
引用该论文: ZHANG Rong,LUO Pei. Deformation Behavior and Microstructure Evolution of AZ61 Magnesium Alloy during Hot Compression[J]. Materials for mechancial engineering, 2014, 38(8): 11～15
张蓉,罗裴. AZ61镁合金的热压缩变形行为及组织演变[J]. 机械工程材料, 2014, 38(8): 11～15
被引情况:
【1】杨阳,毛萍莉,刘正,王峰,王志, "银合金化镁钙合金中AgMg、Mg2Ca和AgCa相的第一性原理计算",机械工程材料 40, 66-70(2016)
【2】宫敏利,刘楚明,周小杰, "均匀化退火时间和轧制道次对镁钆钇锌锆合金组织及拉伸性能的影响",机械工程材料 40, 13-17(2016)
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【6】孙述利,张敏刚,周俊琪,等.AZ31镁合金在热压缩过程中的变形行为［J］.机械工程材料,2010,34(8): 88-90.
【7】肖心萍,于彦龙,王亚楠.AZ91镁合金的热压缩变形行为及晶粒细化［J］.机械工程材料,2011,35(5): 93-95.
【8】毛建军,潘复生,陈先华,等.ZK60镁合金的热压缩变形行为［J］.材料导报,2010,24(2): 58-62.
【9】王少楠,唐国翌,傅万堂,等.铸态AZ61镁合金热压缩变形组织变化［J］.材料热处理学报,2009,30(5): 39-43.
【10】MYSHLYAEV M M, MCQUEEN H J, MWEMBELA A, et al. Twinning, dynamic recovery and recrystallization in hot worked Mg-Al-Zn alloy［J］.Science and Engineering: A,2002,337: 121-131.
【11】SLOOFF F A, ZHOU J, DUSZCZYK J, et al. Constitutive analysis of wrought magnesium alloy Mg-AL4-Znl［J］.Scripta Materialia, 2007,57(8): 759-762.
【12】MCQUEEN H J, RYAN N D. Constitutive analysis in hot working［J］.Materials Science and Engineering: A,2002,322(1/2): 43-63.
【13】MOREAU G, CORNET J A, CALAIS D. Acceleration de la diffusion chimique sous irradiation dans le systeme aluminium-magnesium［J］.Journal of Nuclear Materials,1971,38(2): 197-202.
【14】WU Y Z, YAN H G, CHEN J H, et al. Hot deformation behavior and microstructure evolution of ZK21 magnesium alloy［J］.Materials Science and Engineering: A,2010,527: 3670-3675.
【15】YIN D L, ZHANG K F, WANG G F, et al. Warm deformation behavior of hot rolled AZ31 Mg alloy［J］.Materials Science and Engineering: A,2007,392: 320-325.
【16】陈振华,许芳艳,傅定发,等.镁合金的动态再结晶［J］.化工进展,2006,25(2): 140-146.
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