高应变速率多向锻造<strong>Mg-8Gd-1Er-0.5Zr</strong>合金的微观组织、织构及力学性能

doi:10.11900/0412.1961.2020.00388

金属学报

2021, Vol. 57

Issue (8): 1000-1008 DOI: 10.11900/0412.1961.2020.00388

研究论文

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高应变速率多向锻造Mg-8Gd-1Er-0.5Zr合金的微观组织、织构及力学性能

丁宁¹, 王云峰², 刘轲¹, 朱训明², 李淑波¹, 杜文博¹(

)

^1.北京工业大学材料与制造学部北京 100124
^2.威海万丰镁业科技发展有限公司威海 264209

Microstructure, Texture, and Mechanical Properties of Mg-8Gd-1Er-0.5Zr Alloy by Multi-Directional Forging at High Strain Rate

DING Ning¹, WANG Yunfeng², LIU Ke¹, ZHU Xunming², LI Shubo¹, DU Wenbo¹(

)

^1.Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
^2.Weihai Wanfeng Magnesium S&T Development Co. , Ltd. , Weihai 264209, China

引用本文:

丁宁, 王云峰, 刘轲, 朱训明, 李淑波, 杜文博. 高应变速率多向锻造Mg-8Gd-1Er-0.5Zr合金的微观组织、织构及力学性能[J]. 金属学报, 2021, 57(8): 1000-1008.
Ning DING, Yunfeng WANG, Ke LIU, Xunming ZHU, Shubo LI, Wenbo DU. Microstructure, Texture, and Mechanical Properties of Mg-8Gd-1Er-0.5Zr Alloy by Multi-Directional Forging at High Strain Rate[J]. Acta Metall Sin, 2021, 57(8): 1000-1008.

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摘要:

以固溶态Mg-8Gd-1Er-0.5Zr (质量分数，%)合金为对象，研究了在高应变速率多向锻造过程中合金微观组织及织构的演变规律，并探讨了高应变速率多向锻造对合金力学性能的影响机制。结果表明，变形初期，合金晶粒内部的大部分{ $10 1 ¯ 2$ }拉伸孪晶被激发，随着累积应变(ΣΔε)的增加，孪晶面积分数降低，再结晶面积分数增高，再结晶机制以连续动态再结晶为主，同时伴有不连续动态再结晶和孪生诱导再结晶。合金晶粒细化分为2个阶段：当ΣΔε < 1.32时，为孪晶破碎机制，晶粒尺寸由初始态的33.0 μm细化至13.1 μm；当ΣΔε ≥ 1.32时，为动态再结晶细化机制，晶粒尺寸进一步细化至4.2 μm。合金织构随ΣΔε增加由基面织构转变为双峰织构，且织构强度增加。ΣΔε = 0.66时，多向锻造Mg-8Gd-1Er-0.5Zr合金的抗拉强度、屈服强度和延伸率分别达到295 MPa、252 MPa和13.8%，比固溶态分别提高了80%、157%和13.1%。

关键词 ： Mg-Gd-Er-Zr合金, 多向锻造, 孪生, 晶粒细化, 织构, 力学性能

Abstract：

Magnesium alloys have attracted significant attention due to their excellent characteristics, such as low density, high specific strength, high thermal conductivity, and superior damping ability. The prominent advantages of using magnesium-alloy parts are environmental protection, energy conservation, and emission reduction, especially forged magnesium-alloy parts, which are used to reduce the weight of equipment in transportation and aerospace fields. Presently, there are relatively few investigations on the forged Mg-RE alloys. Based on Mg-Gd binary alloy, a series of Mg-Gd-Er-Zr alloys were developed, exhibiting excellent room-temperature mechanical properties and high-temperature creep resistance. In this study, the Mg-8Gd-1Er-0.5Zr (mass fraction, %) alloy was conducted using a multi-directional forging (MDF) at a high strain rate. The microstructure and texture evolution in various accumulated strains (ΣΔε) were examined, and their effects on the mechanical properties of the alloy were discussed. The results showed that the { $10 1 ¯ 2$ } extension twinning was activated within most grains in the early stage of forging. With an increase in ΣΔε, the area fraction of twin decreases, while the area fraction of recrystallization increases. Continuous dynamic recrystallization (CDRX) was the dominant mechanism, supplemented by discontinuous dynamic recrystallization (DDRX) and twin-induced recrystallization (T-DRX). The grain refinement was attributed to the twin-breaking, and the grain size decreased from 33.0 μm to 13.1 μm when ΣΔε was less than 1.32. However, it was attributed to the dynamic recrystallization, and the grain size was further refined to 4.2 μm when ΣΔε was greater than 1.32. As ΣΔε increases, the texture of the alloy changed from basal to double-peak texture, and its intensity increased. When ΣΔε = 0.66, the tensile strength, yield strength, and elongation at room-temperature of the MDFed-alloy reached 295 MPa, 252 MPa, and 13.8%, respectively, which were 80%, 157%, and 13.1% higher than those of the as-solution state.

Key words： Mg-Gd-Er-Zr alloy multi-directional forging twinning grain refinement texture mechanical property

收稿日期: 2020-09-24

ZTFLH:

TG146.2

基金资助:国家重点研发计划项目(2016YFB0101604);北京市教委重点课题项目(KZ201810005005)

作者简介: 丁宁，男，1995年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00388 或 https://www.ams.org.cn/CN/Y2021/V57/I8/1000

图1 锻造工艺流程示意图

图2 固溶态Mg-8Gd-1Er-0.5Zr (GE81K)合金的OM像及XRD谱

图3 固溶态GE81K合金在累积应变(ΣΔε)为0.66和1.32时的反极图和孪晶分布图，以及ΣΔε = 0.66时变形晶粒内和孪晶界/内部的小角度晶界

图4 固溶态GE81K合金在ΣΔε为1.98和2.64时的反极图和孪晶分布图

图5 固溶态GE81K合金的EBSD分析(a) initial coarse grains divided by twins (ΣΔε = 0.66)(b) distribution of misorientation along line T1 in Fig.3b (ΣΔε = 1.32)(c) twin-induced DRX grains (T-DRX) (ΣΔε = 0.66)

图6 不同累积应变时固溶态GE81K合金的{0001}面极图

图7 不同累积应变时固溶态GE81K合金基面法向偏离锻造方向(FD)的角度分布

图8 固溶态GE81K合金的孪晶面积分数和平均晶粒尺寸随累积应变的变化趋势

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