[1]王晓芳,孙扬善,沈超,等.Mg-4Nd和Mg-4Nd-0.7Zr合金显微组织和力学性能[J].东南大学学报(自然科学版),2008,38(3):477-482.[doi:10.3969/j.issn.1001-0505.2008.03.022]
 Wang Xiaofang,Sun Yangshan,Shen Chao,et al.Microstructures and mechanical properties of extruded Mg-4Nd and Mg-4Nd-0.7Zr alloys[J].Journal of Southeast University (Natural Science Edition),2008,38(3):477-482.[doi:10.3969/j.issn.1001-0505.2008.03.022]
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Mg-4Nd和Mg-4Nd-0.7Zr合金显微组织和力学性能()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
38
期数:
2008年第3期
页码:
477-482
栏目:
材料科学与工程
出版日期:
2008-05-20

文章信息/Info

Title:
Microstructures and mechanical properties of extruded Mg-4Nd and Mg-4Nd-0.7Zr alloys
作者:
王晓芳1 孙扬善1 沈超1 薛烽1 陶卫建2
1 东南大学材料科学与工程学院, 南京 211189; 2 南京云海特种金属有限公司, 南京 211221
Author(s):
Wang Xiaofang1 Sun Yangshan1 Shen Chao1 Xue Feng1 Tao Weijian2
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2 Nanjing Welbow Metals Co., Ltd., Nanjing 211221, China
关键词:
Mg Nd Zr 时效 力学性能 形变强化
Keywords:
Mg Nd Zr aging mechanical properties work hardening
分类号:
TG146.22
DOI:
10.3969/j.issn.1001-0505.2008.03.022
摘要:
制备了Mg-4Nd和Mg-4Nd-0.7Zr两种合金,并系统研究了它们在各种状态下的组织和性能.研究结果表明:铸态的二元Mg-4Nd合金由α-Mg基体和中间相Mg12Nd组成,少量Zr(0.7%质量百分数)的加入使合金铸态组织得到明显细化,且使Mg12Nd相呈网状连续分布于晶界.合金经热挤压加工后,强度和塑性均得到大幅度改善.由于在合金挤压及热处理过程中,Zr明显提高了再结晶温度并抑制了再结晶后晶粒的长大,因此Zr的加入使Mg-4Nd合金在挤压和时效处理后强度都有不同程度的提高.直接时效(T5)处理工艺能产生形变强化和时效硬化双重作用,使合金呈现良好的综合力学性能.在对合金时效组织的TEM观察中发现了β’β两种沉淀颗粒,其尺度均在10~100 nm之间,它们都对合金产生了沉淀硬化作用.
Abstract:
Two alloys, Mg-4Nd and Mg-4Nd-0.7Zr, have been prepared in a mild steel crucible. The microstructures and mechanical properties of these two alloys are investigated. The as-cast microstructure of Mg-4Nd alloy consists of α-Mg matrix and an intermetallic compound Mg12Nd. Small amount of Zr addition greatly refines the as-cast microstructure, and results in consecutive distribution of Mg12Nd along grain boundaries. Hot extrusion causes significant improvement of tensile properties of both alloys. Zr addition to the binary Mg-4Nd alloy raises the recrystallization temperature of the alloy and inhibits the growth of the matrix grains. Therefore, the strengths of extruded and aged specimens of the Mg-4Nd-0.7Zr alloy are notably higher than that without Zr addition. Direct aging(T5 treatment)of extruded samples at 225 ℃ leads to remarkable improvement of tensile properties due to the combined effect of work hardening and age hardening. Transmission electron microscopy(TEM)observations reveal two kinds of precipitates, β’ and β, from the aged sample. The size of both precipitates are in the range of 10 to 100 nm. The precipitates exhibit significant effect of age hardening on the alloy.

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备注/Memo

备注/Memo:
作者简介: 王晓芳(1982—),女,硕士生; 孙扬善(联系人),男,教授,博士生导师,yssun@seu.edu.cn.
基金项目: 江苏省自然科学基金预研资助项目(BK2004208).
引文格式: 王晓芳,孙扬善,沈超,等.Mg-4Nd和Mg-4Nd-0.7Zr合金显微组织和力学性能[J].东南大学学报:自然科学版,2008,38(3):477-482.
更新日期/Last Update: 2008-05-20