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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2866-07
1460铝锂合金的力学性能与微观组织
李劲风1,陈永来2,张绪虎2,许秀芝2,郑子樵1

(1. 中南大学 材料科学与工程学院,湖南 长沙,410083; 2. 航天材料及工艺研究所,北京,100076)

摘 要: 采用金相观察、拉伸性能测试及透射电镜分析等手段研究1460铝锂合金的铸态组织、薄板T6态单级时效(160 ℃)及T8态双级时效(5%预变形,130 ℃+160 ℃时效)处理时力学性能及微观组织的演化。研究结果表明:添加微量Sc元素时,凝固时形成Al3(Sc,Zr)初生相粒子,1460铝锂合金铸锭树枝晶组织被消除,晶粒呈等轴状,粒度较小(20~50 mm);而冷轧薄板固溶处理后为细小的带状晶粒组织;1460铝锂合金主要时效析出强化相为d′相(Al3Li),其次为T1相(Al2CuLi),但在时效过程中可能形成q″(q′)(Al2Cu)过渡相;在时效过程中,时效前期快速析出d?相;随时效时间延长,d′相长大,并析出q??(q′)过渡相;随着时效时间进一步延长,T1相析出,而q″(q′)过渡相消失;与T6态时效相比,T8态时效时T1相尺寸降低但密度增大,强度提高。

 

关键词: 铝锂合金;力学性能;微观组织

Mechanical properties and microstructure of 1460 Al-Li alloy
LI Jinfeng1, CHEN Yonglai2, ZHANG Xuhu2, XU Xiuzhi2, ZHENG Ziqiao1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China

Abstract:The as-cast structure, mechanical properties and microstructural evolution of 1460 Al-Li alloy sheet during T6 one-step aging at 160 ℃ and T8 two-step aging (5% predeformation followed by aging at 130℃ and then 160 ℃) were investigated by using metallographic microscopy, tensile measurement and tansmission electronic microscopy(TEM).The results show that the dendritic structure of cast ingot is eliminated and equi-axed grains with fine size of 20-50 mm are formed due to the formation of primary crystal particle Al3(Sc,Zr) during solidification process. Meanwhile, the solutionized sheet is featured with fine elongated grain structure. The main aging precipitate of 1460 Al-Li alloy is d? (Al3Li), but considerable T1 (Al2CuLi) phases are also precipitated. Transitional phase of q″(or q?) (Al2Cu) is formed during the aging process. In the under-aging stage, d? phases are precipitated rapidly. With the increase of aging time, the transitional phase of q″(q?) is precipitated. Finally, T1 precipitates are formed and transitional phase of q??(q?) disappears. Compared to the T6 aging, T1 precipitates with higher population density and smaller size are formed in the T8 aging, the strength of the T8-aged alloy is therefore enhanced.

 

Key words: Al-Li alloy; mechanical property; microstructure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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