Effects of forging technique on microstructure and mechanical properties of ZK21 magnesium alloy

被引：0

作者：

Wu, Yuanzhi ^{[1
,2
]}

Yan, Hongge ^{[3
]}

Zhu, Suqin ^{[3
]}

Liu, Xianlan ^{[1
,2
]}

Liu, Anmin ^{[1
,2
]}

Zhang, Rong ^{[1
,2
]}

机构：

[1] Department of Mechanical Engineering, Hunan Institute of Technology, Hengyang

[2] Institution of Applied Fundamental Research of Hunan Province for Automobile Parts Manufacturing and Efficiency Promotion Technology, Hengyang

[3] School of Materials Science and Engineering, Hunan University, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2015年 / 46卷 / 02期

关键词：

Forging technique; High strain rate forging; Mechanical properties; Microstructure; ZK21; magnesium;

D O I：

10.11817/j.issn.1672-7207.2015.02.010

中图分类号：

学科分类号：

摘要：

The high strain rate forging of ZK21 magnesium alloy was conducted on the pneumatic power hammer, and the microstructure and mechanical properties of the forged alloys processed by different forging techniques including uniaxial forging (UF), biaxial forging (BF) and triaxial forging (TF) were investigated. The results show that higher strain should be accumulated on ZK21 alloy by alternating the loading direction, which consequently results in extensive grain refinement and excellence mechanical properties. Twinning induced dynamic recrystallization (TDRX) is the main DRX mechanism of BF, which consequently results in ultrafine grains with average grain size of 0.3 μm. However, both rotation DRX (RDRX) and TDRX are responsible for the DRX during TF, which consequently results in a novel mixed structure of honeycombe-like coarse DRX grains with average grain size of 15 μm and island-like ultrafine grains with average grain size of 0.3 μm. An excellent combination of mechanical property is achieved in biaxial forged and triaxial forged alloys at accumulated strain of 2.64. The ultimate tensile strength (UTS), yield strength (YS) and elongation of biaxial forged alloy are 355.7 MPa, 295 MPa and 16.6%, respectively. The VTS, YS and elongation of triaxial forged alloy are 341.6 MPa, 270.7 MPa and 25.1%, respectively. ©, 2015, Central South University of Technology. All right reserved.

引用

页码：444 / 451

页数：7

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