Effects of Gd on microstructures and mechanical properties of as-cast Mg-8Li-4Zn-xGd alloys

被引：0

作者：

Xu C.-J. ^{[1
,2
]}

Xu X.-F. ^{[1
,4
]}

Ma T. ^{[1
,2
]}

Meng L.-N. ^{[1
,2
]}

Zhang Z.-M. ^{[1
,2
]}

Shechtman D. ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Xi'an University of Technology, Xi'an

[2] Xi'an Shechtman Nobel Price New Materials Institute, Xi'an

[3] Department of Electrical and Mechanical Engineering, Shaanxi Railway Institute, Weinan

[4] Shanghai Spaceflight Precision Machinery Institute, Shanghai

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2020年 / 30卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Gd; Mechanical properties; Mg-Li alloy; Microstructure; Phase composition;

D O I：

10.11817/j.ysxb.1004.0609.2020-35568

中图分类号：

学科分类号：

摘要：

As-cast ingots of Mg-8Li-4Zn-xGd(x=1, 3, 5) alloys were prepared by lithium flux protection in an electric-resistance furnace. The effects of Gd addition on microstructures and mechanical properties of as-cast Mg-8Li-4Zn-xGd alloys were investigated. The results show that the matrix of as-cast Mg-8Li-4Zn-xGd alloys is consisted of α-Mg (HCP) and β-Li (BCC) phase. With the content of Gd increasing, the Mg5Gd eutectic and Zn12Gd compound are gradually connected into network, isolating α and β eutectic into equiaxed with a dimension from 20 μm to 40 μm or eutectic-cell similar to those in the cast iron, which can refine α-Mg and the continuous β-Li phase effectively. The large Mg2Zn11 particles are dispersed in β-Li phase and the Mg51Zn20 phases are distribution at the grain boundary of α-Mg phase. Zn can also precipitate the fine dispersed MgZn phases in the β-Li phase and the quantity increases with the increase of Gd content, which can directly dispersion strengthening β-Li phase. In addition, Zn and Gd have a great influence on the hardness of as-cast alloy, and with the Gd content increasing, the tensile strength of Mg-8Li-4Zn-xGd alloys increases, while the elongation decreases. © 2020, Science Press. All right reserved.

引用

页码：793 / 800

页数：7

共 34 条

[1] ABBASSI F, SRINIVASAN M, LOGANATHAN C, NARAYANASAMY R, GUPTA M., Experimental and numerical analyses of magnesium alloy hot workability, Journal of Magnesium and Alloys, 4, 4, pp. 295-301, (2016)
[2] WU Z X, CURTIN W A., The origins of high hardening and low ductility in magnesium, Nature, 526, 7571, pp. 62-67, (2015)
[3] SONG Bo, XIN Ren-long, GUO Ning, LIU Ting-ting, YANG Qing-shan, Research progress of strain hardening behavior at room temperature in wrought magnesium alloys, The Chinese Journal of Nonferrous Metals, 24, 11, pp. 2699-2710, (2014)
[4] GUO X F, REMENNIK S, XU C J, SHECHTMAN D., Development of Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6%Zr magnesium alloy and its microstructural evolution during processing, Materials Science and Engineering A, 473, 1, pp. 266-273, (2008)
[5] XU Chun-jie, MA Tao, TU Tao, ZHANG Zhong-ming, WANG Jin-cheng, Review of strengthening and application of ultralight Mg-Li alloys, Ordnance Material Science and Engineering, 35, 2, pp. 97-100, (2012)
[6] BI Guang-li, LI Yuan-dong, HUANG Xiao-feng, CHEN Ti-jun, MA Ying, HAO Yuan, Effect of Zn addition on microstructure and mechanical properties of as-cast Mg-Dy alloy, The Chinese Journal of Nonferrous Metals, 25, 4, pp. 875-882, (2015)
[7] SHI Yu-tong, DU Jun, HUANG Zheng-yang, LI Wen-fang, Effects of different manganese additions on microstructure of Mg-3%Al alloy, The Chinese Journal of Nonferrous Metals, 28, 5, pp. 916-922, (2018)
[8] XU Chun-jie, GUO Xue-feng, ZHANG Zhong-ming, JIA Shu-zhuo, LIU Li, Microstructure and properties of reciprocating extruded and continuing forward extruded wire materials of AZ91D alloys, Rare Metal Materials and Engineering, 36, 3, pp. 500-504, (2007)
[9] XU Chun-jie, GUO Xue-feng, LIU Li, ZHANG Zhong-ming, Quasicrystal strengthened rapid solidification Mg92.5Zn6.4Y1.1 alloys by reciprocating extrusion, Journal of the Chinese rare earth society, 25, 2, pp. 224-228, (2007)
[10] GUO F, ZHANG D F, YANG X, JIANG L Y, PAN F S., Microstructure and texture evolution of AZ31magnesium alloy during large strain hot rolling, Transactions of Nonferrous Metals Society of China, 25, 1, pp. 14-21, (2015)

← 1 2 3 4 →