Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第8期    总第209期    2016年8月

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文章编号:1004-0609(2016)-08-1597-10
Mg-5Zn-1Mn合金高应变速率热压缩过程中的组织演变和流变行为
陈 潮1, 2,严红革1, 2,陈吉华1, 2,夏伟军1, 2,苏 斌1, 2,曹梦馨1,宋 旼3

(1. 湖南大学 材料科学与工程学院,长沙 410082;
2. 湖南大学 喷射沉积技术及应用湖南省重点实验室,长沙 410082;
3. 中南大学 粉末冶金国家重点实验室,长沙 410083
)

摘 要: 采用Gleeble-3500热模拟试验机对Mg-5Zn-1Mn镁合金进行大变形(变形量为80%)热压缩实验,研究变形温度为250~400 ℃、应变速率为1~40 s-1范围内变形过程中合金的组织演变规律和流变行为。结果表明:该合金在上述工艺条件下进行热压缩变形时均发生了明显的动态再结晶,且高应变速率下获得的再结晶组织在较低应变速率下更为均匀、细小。通过分析流变应力变化过程中对应的微观机理,表明高应变速率更利于Mg-5Zn-1Mn镁合金实现大塑性变形。Mg-5Zn-1Mn合金的变形激活能随着变形温度的升高和应变速率的增大而减小。

 

关键字: Mg-5Zn-1Mn合金;流变行为;高应变速率;激活能

Microstructure evolution and flow behaviour of Mg-5Zn-1Mn alloy during high strain rate hot compression
CHEN Chao1, 2, YAN Hong-ge1, 2, CHEN Ji-hua1, 2, XIA Wei-jun1, 2, SU Bin1, 2, CAO Meng-xin1, SONG Min3

1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Hunan Provincial Key Laboratory of Spray Deposition Technology and Application,
Hunan University, Changsha 410082, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:The hot compression tests were performed on Mg-5Zn-1Mn alloy with the large deformation of 80% by the Gleeble-3500 material simulation machine. The microstructure evolution and flow behaviour were studied at the deformation temperature range from 250 to 400 ℃ and the strain rate range from 1 to 40 s-1. The dynamic recrystallization (DRX) occurs obviously during hot deformation, the DRX microstructure developed at high strain rate is more uniform, and the grain size is smaller than that developed at low strain rate. The severe plastic deformation of ZM51 magnesium alloy can be achieved more effectively at high strain rate compared to low strain rate by analyzing the microscopic mechanism during the change of flow stress. The hot deformation activation energy decreases with increasing the deformation temperature and strain rate.

 

Key words: Mg-5Zn-1Mn magnesium alloy; flow behaviour; high strain rate; activation energy

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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