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31卷    第5期    总第266期    2021年5月

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文章编号:1004-0609(2021)-05-1214-13
细晶高强度Mg-Gd-Y-Zn-Zr合金热变形本构方程及组织演变模型
骆俊廷1, 2,赵静启1,李 建3,王 强1,李洪波1,李英梅2,郗晨阳1

(1. 燕山大学 机械工程学院 先进锻压成形技术与科学教育部重点实验室,秦皇岛 066004;
2. 燕山大学 亚稳材料制备技术与科学国家重点实验室,秦皇岛 066004;
3.秦皇岛燕大现代集成制造技术开发有限公司,秦皇岛 066004
)

摘 要: 利用Thermecmastor-Z热模拟试验机,在变形温度为350~450 ℃、应变速率为0.001~1 s-1条件下,对一种平均晶粒尺寸为4.1 μm、室温抗拉强度达到324 MPa的细晶高强度Mg-Gd-Y-Zn-Zr合金进行了热压缩变形试验。利用Arrenhenius模型描述该合金的热流变行为,并构建了热变形本构方程。结果表明:基于试验数据绘制的真应力-应变曲线显示出较为明显的动态再结晶行为特征。通过数据拟合得出再结晶临界应力约为峰值应力的0.851,临界应变约为峰值应变的0.309;建立了动态再结晶临界应变模型和变形温度为350、400和450 ℃,应变速率为0.01、0.1和1 s-1条件下的动态再结晶体积分数预测模型。所建立的方程和模型可为细晶高强度Mg-Gd-Y-Zn-Zr合金热变形过程力学行为及组织演变行为的预测提供依据。

 

关键字: 细晶高强度;Mg-Gd-Y-Zn-Zr合金;热压缩变形;本构方程;动态再结晶模型

Constitutive equation and microstructure evolution model of fine-grained and high-strength Mg-Gd-Y-Zn-Zr alloy during hot deformation
LUO Jun-ting1, 2, ZHAO Jing-qi1, LI Jian3, WANG Qiang1, LI Hong-bo1, LI Ying-mei2, XI Chen-yang1

1. Key Laboratory of Advanced Forging & Stamping Technology and Science, Education Ministry, Yanshan University, Qinhuangdao 066004, China;
2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;
3. Qinhuangdao Yanda Contemporary Integrated Manufacturing Technology Development Co., Ltd., Qinhuangdao 066004, China

Abstract:Under the conditions of a deformation temperature range from 350 ℃ to 450 ℃ and a strain rate range from 0.001 s-1 to 1 s-1, the Thermocomstor-Z thermal simulation testing machine was used to conduct a hot compression deformation test on a fine-grained and high-strength Mg-Gd-Y-Zn-Zr alloy, with average grain size of 4.1 μm and room temperature tensile strength of 324 MPa. Based on the test data, the true stress-strain curve which shows obvious characteristics of dynamic recrystallization behavior was established. The results show that, based on the test data, the true stress-strain curve which shows obvious characteristics of dynamic recrystallization behavior is drawn. Through data fitting, it is concluded that the critical stress of recrystallization is about 0.851 of the peak stress, and the critical strain is about 0.309 of the peak strain. A dynamic recrystallization critical strain model and a dynamic recrystallization volume fraction prediction model are established. The applicable conditions of the volume fraction prediction model are deformation temperature of 350 ℃, 400 ℃ and 450 ℃, and strain rate of 0.01 s-1, 0.1 s-1 and 1 s-1. The established equations and models can provide a basis for predicting the mechanical behavior and microstructure evolution behavior of the fine-grained and high-strength Mg-Gd-Y-Zn-Zr alloy during hot deformation.

 

Key words: fine-grained and high-strength; Mg-Gd-Y-Zn-Zr alloy; hot compression deformation; constitutive equation; dynamic recrystallization model

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

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

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