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工艺技术

单级时效处理对2A97铝锂合金组织、力学性能和腐蚀性能的影响

  • 游任轩 ,
  • 马运柱 ,
  • 汤娅 ,
  • 赵心阅 ,
  • 刘文胜
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  • 中南大学 粉末冶金研究院,长沙 410083

收稿日期: 2022-03-22

  修回日期: 2022-04-03

  网络出版日期: 2022-06-06

基金资助

十三五装备预研共用技术项目(2021-JXXQ-XX-01XX)

Effects of single-stage aging treatment on microstructure, mechanical properties and corrosion properties of 2A97 Al-Li alloys

  • YOU Renxuan ,
  • MA Yunzhu ,
  • TANG Ya ,
  • ZHAO Xinyue ,
  • LIU Wensheng
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  • Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

Received date: 2022-03-22

  Revised date: 2022-04-03

  Online published: 2022-06-06

摘要

为了确定单级时效制度对2A97铝锂合金组织、力学性能和腐蚀性能的影响,采用室温拉伸、晶间腐蚀、剥落腐蚀、电化学腐蚀和TEM观察等方法,对不同单级时效处理后的合金组织和性能进行表征测试。结果表明:随着时效温度升高,2A97铝锂合金达到最佳力学性能所需时间缩短。随时效温度升高、时效时间延长,合金的抗腐蚀性能下降。165 ℃时效60 h后,合金的抗拉强度、屈服强度和伸长率分别达到549 MPa、484 MPa和8.8%,晶间腐蚀等级为4级,剥落腐蚀评级EC。

本文引用格式

游任轩 , 马运柱 , 汤娅 , 赵心阅 , 刘文胜 . 单级时效处理对2A97铝锂合金组织、力学性能和腐蚀性能的影响[J]. 粉末冶金材料科学与工程, 2022 , 27(4) : 398 -408 . DOI: 10.19976/j.cnki.43-1448/TF.2022030

Abstract

In order to determine the effects of single-stage aging regime on the microstructures, mechanical properties and corrosion properties of 2A97 Al-Li alloys, the methods of room temperature tensile, intergranular corrosion, exfoliation corrosion, electrochemical corrosion and TEM observation were used to investigate the microstructure, mechanical properties and corrosion properties of 2A97 Al-Li alloys after different single-stage aging treatments. The alloys were tested and characterized. The results show that with increasing the aging temperature, the aging time for 2A97 Al-Li alloys to obtain the best mechanical properties decreases. With increasing the aging temperature and aging time, the corrosion resistance of the alloys decreases. After aging at 165 ℃ for 60 h, the tensile strength, yield strength and elongation of the alloys are 549 MPa, 484 MPa, and 8.8%, respectively, the intergranular corrosion is grade 4, and the exfoliation corrosion grade is EC.

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