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26卷    第7期    总第208期    2016年7月

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文章编号:1004-0609(2016)-07-1365-07
再时效处理对2219-T6铝合金叉形环显微组织和力学性能的影响
黄元春1, 2,王也君1, 2,肖政兵1, 2,任贤魏1, 2,许天成1, 2,李 音1, 2

(1. 中南大学 高性能复杂制造国家重点实验室,长沙 410083;
2. 中南大学 轻合金研究院,长沙 410083
)

摘 要: 通过扫描电镜(SEM)、透射电镜(TEM)和室温拉伸性能测试等分析方法,研究再时效处理对2219-T6铝合金叉形环显微组织与力学性能的影响。结果表明:在170 ℃下再时效12 h时,构件抗拉强度达到406 MPa,屈服强度达到314 MPa,伸长率为8%,其力学性能和成形性的综合效果最佳。延长时效时间,与(170 ℃,12 h)时效态相比,第二相粒子出现明显的团聚现象,晶界无析出带(PFZ)宽度增加,合金中析出相长宽比减小,θ″相含量下降,大部分转变成亚稳相θ′,部分生成粗大的平衡相θ,其力学性能明显下降。

 

关键字: 2219铝合金;叉形环;再时效;显微组织;力学性能

Effect of reaging on microstructures and mechanical properties of 2219-T6 alloy fork-like ring
HUANG Yuan-chun1, 2, WANG Ye-jun1, 2, XIAO Zheng-bing1, 2, REN Xian-wei1, 2, XU Tian-cheng1, 2, LI Yin1, 2

1.State Key Laboratory of High Performance and Complex Manufacturing,
Central South University, Changsha 410083, China;
2. Light Alloy Research Institute, Central South University, Changsha 410083, China

Abstract:The effects of reaging on the microstructures and mechanical properties of 2219-T6 alloy fork-like ring were investigated by tensile test, scanning electron microcopy (SEM) and transmission electron microscopy (TEM). The results show that after reaging at 170 ℃ for 12 h, the tensile strength, yield strength and elongation of the fork-like ring are 406 MPa, 314 MPa, 8%, respectively. Increasing the aging time, the mechanical properties of the alloy has fallen greatly because of denser precipitates and wide precipitate free zones (PFZ). Compared to aging treatment (170 ℃, 12 h), the aspect ratio of precipitates decreases and large number of θ″ precipitates transform into θ′ precipitates, some of that become thick θ precipitate.

 

Key words: 2219 aluminum alloy; fork-like ring; reaging; microstructures; mechanical property

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

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

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