Effects of pre-stretch on microstructure, mechanical properties and corrosion resistance of 2A14 aluminum alloy

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(23)66454-4

Lan-ping HUANG , Long-long HE , Song LI , Wen-sheng LIU , Jing HUANG , Song-yi CHEN

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Abstract

The microstructure, mechanical properties and corrosion behaviors of the peak-aged 2A14 aluminum alloys subjected to pre-stretch prior to artificial aging were investigated. The results indicate that the hardness and strength of the peak-aged alloy can be greatly enhanced via introducing pre-stretch due to the formation of dense and finer θ′ precipitates with dispersed distribution in alloy matrix. Pre-stretch prior to peak aging evidently enhances the peak aging hardness and shortens the peak aging time of the alloy. A pre-stretching degree of 7.5% leads to a distinct inhomogeneous distribution of θ′ phase, which decreases the ultimate tensile strength. As pre-stretching degree increases, the plasticity, impact toughness and exfoliation corrosion (EXCO) resistance of the peak-aged alloy all gradually decrease, but its resistance to intergranular corrosion (IGC) increases and then decreases.

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预拉伸对 2A14 铝合金微观结构、机械性能和耐腐蚀性的影响

研究了峰值时效 2A14 铝合金的微观结构、力学性能和腐蚀行为。结果表明，通过引入预拉伸，在合金基体中形成了致密细小且分布分散的θ′析出物，从而大大提高了峰值时效合金的硬度和强度。峰值时效前的预拉伸明显提高了合金的峰值时效硬度，缩短了峰值时效时间。7.5% 的预拉伸度会导致θ′相出现明显的不均匀分布，从而降低极限抗拉强度。随着预拉伸度的增加，峰值时效合金的塑性、冲击韧性和抗剥落腐蚀（EXCO）性能都逐渐降低，但其抗晶间腐蚀（IGC）性能先增加后降低。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.