时效工艺对超低温成形2060铝锂合金组织及性能的影响

doi:10.13251/j.issn.0254-6051.2023.10.009

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 66-71.DOI: 10.13251/j.issn.0254-6051.2023.10.009

时效工艺对超低温成形2060铝锂合金组织及性能的影响

贾延祯^1,2, 易幼平^1,2,3, 黄始全^1,2,3, 董非^1,2, 黄珂^1,2

1.中南大学轻合金研究院, 湖南长沙 410083;
2.中南大学高性能复杂制造国家重点实验室, 湖南长沙 410083;
3.中南大学机电工程学院, 湖南长沙 410083

收稿日期:2023-06-28 修回日期:2023-09-06 出版日期:2023-10-25 发布日期:2023-12-07
通讯作者: 易幼平,教授,博士,E-mail:yyp@csu.edu.cn
作者简介:贾延祯(1998—),男,硕士研究生,主要研究方向为铝锂合金超低温成形与热处理工艺,E-mail:543052081@qq.com。

Effect of aging process on microstructure and properties of 2060 Al-Li alloy formed at cryogenic temperature

Jia Yanzhen^1,2, Yi Youping^1,2,3, Huang Shiquan^1,2,3, Dong Fei^1,2, Huang Ke^1,2

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

Received:2023-06-28 Revised:2023-09-06 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 通过透射电镜(TEM)、扫描电镜(SEM)表征分析及单轴拉伸测试等手段,研究了时效温度与时间对2060铝锂合金力学性能及组织演变的影响,获得与超低温成形相适配的最佳时效工艺参数。结果表明,在时效初期,合金的析出相以球状δ′相和针状T₁相为主;随着时效时间的延长,T₁相不断形核长大,而δ′相数量不断减少,T₁相对位错运动的阻碍作用增大,合金强度不断提高并到达峰值。随着时效时间进一步延长,T₁相的数量不再变化,但其形态变得粗大,合金强度有所下降。分别在165、175、185 ℃进行时效时,随着时效温度的升高,合金到达峰值时效的时间变短,但与较高温度时效相比,较低温度时效后析出相形态更加细长,分布更加弥散,合金峰值时效强度更高。超低温成形2060铝锂合金采用165 ℃×35 h的时效工艺后可获得最佳的综合力学性能,此工艺下获得的合金屈服强度、抗拉强度和伸长率分别为494 MPa、538 MPa和6%。

关键词: 2060铝锂合金, 时效处理, 析出相, 超低温成形, 断口形貌

Abstract: Effects of aging temperature and aging time on the mechanical properties and microstructure evolution of cryogenic-formed 2060 Al-Li alloy were investigated by means of transmission electron microscope (TEM) and scanning electron microscope (SEM). The optimum aging process parameters for cryogenic temperature forming were obtained. The results show that at the initial stage of aging, the precipitated phase of the alloy is mainly spherical δ′ phase and acicular T₁ phase. With the extension of aging time, T₁ phase continues to nucleate and grow, while the number of δ′ phase decreases, the hindrance of slender T₁ relative to dislocation movement increases, and the strength of the alloy increases and reaches the peak value. When the aging time is further prolonged, the number of T₁phase does not change, but the morphology becomes thicker, and the strength of the alloy decreases. When aged at 165 ℃, 175 ℃ and 185 ℃, respectively, the time for the alloy to reach the peak aging becomes shorter with the increase of aging temperature, but compared with the higher temperature aging, the morphology of the precipitated phase after lower temperature aging is longer, the distribution is more dispersed, and the peak strength of the alloy is higher. After cryogenic temperature forming, the best comprehensive mechanical properties of 2060 Al-Li alloy can be obtained by aging at 165 ℃ for 35 h. The yield strength, tensile strength and elongation are 494 MPa, 538 MPa and 6%, respectively.

Key words: 2060 Al-Li alloy, aging treatment, precipitated phase, cryogenic temperature forming, fracture morphology

中图分类号:

TG156.6

贾延祯, 易幼平, 黄始全, 董非, 黄珂. 时效工艺对超低温成形2060铝锂合金组织及性能的影响[J]. 金属热处理, 2023, 48(10): 66-71.

Jia Yanzhen, Yi Youping, Huang Shiquan, Dong Fei, Huang Ke. Effect of aging process on microstructure and properties of 2060 Al-Li alloy formed at cryogenic temperature[J]. Heat Treatment of Metals, 2023, 48(10): 66-71.

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时效工艺对超低温成形2060铝锂合金组织及性能的影响

Effect of aging process on microstructure and properties of 2060 Al-Li alloy formed at cryogenic temperature

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