加工参数对铸态AZ31B镁合金热变形行为及组织演变的影响
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摘要
借助热压缩实验研究了变形温度、应变速率和变形量对铸态AZ31B镁合金热变形行为及组织演变的影响规律。结果表明:(1)峰值应力随着应变速率的降低和温度的升高而减小,主要的形核机制为晶界弓出形核、亚晶旋转形核、孪生诱发形核,以及连续再结晶;(2)低于400℃变形时,温度的升高有利于再结晶的发生及晶粒细化;高于400℃时,晶粒尺寸开始迅速增大;(3)在小于等于400℃变形时,低速率0.1 s~(-1)更有利于再结晶晶粒细化;当变形温度高于400℃时,中速率1 s~(-1)更有利于再结晶晶粒细化;(4)高温低速率变形时,变形量主要影响晶粒尺寸,而高温高速率变形时,变形量主要影响动态再结晶程度。
The effects of deformation temperature, strain rate and height reduction on hot deformation behavior and microstructureevolution of as-cast AZ31B magnesium alloy were researched in terms of hot compression tests. The results show that the peak stressdecreases with the decreasing strain rate and increasing deformation temperature, and the main nucleation mechanism consists of initialgrain boundary bulging nucleation, sub-grain rotation nucleation, twinning induced nucleation as well as continuous recrystallization.Moreover, the deformation temperature is below 400 ℃, the increase in temperature is beneficial to recrystallization and grain refinement,while above 400 ℃, grain size increases rapidly. Furthermore, the deformation temperature is equal to or lower than 400 ℃, the lowerstrain rate of 0.1 s~(-1) is more beneficial to the recrystallized grain refinement, while above 400 ℃, medium strain rate of 1 s~(-1) is moreadvantageous. In addition, it is found that at higher temperature and lower strain rate, height reduction primarily affects the grain size, andat higher temperature and higher strain rate, height reduction primarily affects the dynamic recrystallization degree.
The effects of deformation temperature, strain rate and height reduction on hot deformation behavior and microstructureevolution of as-cast AZ31B magnesium alloy were researched in terms of hot compression tests. The results show that the peak stressdecreases with the decreasing strain rate and increasing deformation temperature, and the main nucleation mechanism consists of initialgrain boundary bulging nucleation, sub-grain rotation nucleation, twinning induced nucleation as well as continuous recrystallization.Moreover, the deformation temperature is below 400 ℃, the increase in temperature is beneficial to recrystallization and grain refinement,while above 400 ℃, grain size increases rapidly. Furthermore, the deformation temperature is equal to or lower than 400 ℃, the lowerstrain rate of 0.1 s~(-1) is more beneficial to the recrystallized grain refinement, while above 400 ℃, medium strain rate of 1 s~(-1) is moreadvantageous. In addition, it is found that at higher temperature and lower strain rate, height reduction primarily affects the grain size, andat higher temperature and higher strain rate, height reduction primarily affects the dynamic recrystallization degree.
引文
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[3]Zhang Zhen(张真).Basie Research on the Plastic Deformation Behavior of AZ31B Mg Alloy(AZ31B镁合金塑性变形行为的相关基础研究)[D].Changsha:Central South University,2011:1
[4]Ahmad I R,Shu D W.Materials Science and Engineering A[J],2014,592:40
[5]Ahmad I R,Shu D W.Solid State Phenomena[J],2012,82:116
[6]Shu D W,Ahmad I R.Advanced Materials Research[J],2011,168-170:1631
[7]Berge F,Krüger L,Ouaziz H et al.Transactions of Nonferrous Metals Society of China[J],2015,25:1
[8]Karimi E,Zarei-Hanzaki A,Pishbin M H et al.Materials Design[J],2013,49:173
[9]Wu H Y,Sun P H,Lin F Z.Materials Science and Engineering A[J],2011,528:2522
[10]Fong K S,Danno A,Tan M J et al.Journal of Materials Processing Technology[J],2017,246:235
[11]Zhao Dingzang(赵丁藏),Zhang Dingfei(张丁非),Liu Yuping(刘渝萍)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2017,46(2):289
[12]Hu Yaobo(胡耀波),Yang Shengwei(杨生伟),Yao Qingshan(姚青山)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2017,46(1):135
[13]Ding Yunpeng(丁云鹏),Zhu Qiang(朱强),Ma Qingwu(马庆武)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2017,46(3):722
[14]Feng F,Huang S Y,Meng Z H et al.Materials Science and Engineering A[J],2014,594:334
[15]Shen Liquan,Yang Qi,Jin Li et al.Transactions of Nonferrous Metals Society of China[J],2014,24(9):2195
[16]Huang Zhiquan(黄志权),Huang Qingxue(黄庆学),Ma Lifeng(马立峰)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2014,43(5):1199
[17]Galiyev A,Kaibyshev R,Gottstein G.Acta Materialia[J],2001,49:1199
[18]Zhao F,Li Y L,Suo T et al.Transactions of Nonferrous Metals Society of China[J],2010,20:1316