预拉伸对2A14铝合金显微组织、力学性能和腐蚀性能的影响
Effects of pre-stretch on microstructure,mechanical properties and corrosion resistance of 2A14 aluminum alloy
黄兰萍 1何龙龙 2李松 2刘文胜 1黄静 2陈送义3
作者信息
- 1. 中南大学粉末冶金研究院,长沙 410083;中南大学轻质高强结构材料国家级重点实验室,长沙 410083
- 2. 中南大学粉末冶金研究院,长沙 410083;中南大学粉末冶金国家重点实验室,长沙 410083
- 3. 中南大学轻合金研究院,长沙 410083;中南大学有色金属先进结构材料与制造协同创新中心,长沙 410083
- 折叠
摘要
研究预拉伸变形量对峰值时效态2A14铝合金显微组织、力学性能和腐蚀行为的影响.结果表明:由于预拉伸导致细小弥散的θ相在基体中大量析出,合金的硬度和强度都明显提升;在峰值时效前引入预拉伸可以明显提高峰值时效硬度并加快到达峰值时效时间;当预拉伸变形量为7.5％时,θ相的分布明显变得更不均匀,这导致极限抗拉强度的下降;随着预拉伸变形量增加,合金塑性、冲击韧性和剥落腐蚀抗力均逐渐下降,但晶间腐蚀抗力先提高后下降.
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.
关键词
2A14铝合金/预拉伸/显微组织/力学性能/腐蚀抗力Key words
2A14 aluminum alloy/pre-stretch/microstructure/mechanical properties/corrosion resistance引用本文复制引用
基金项目
国家自然科学基金(51871245)
国家重点研发计划(2017YFE0301505)
State Key Laboratory for Powder Metallurgy()
State Key Laboratory of Light Weight and High Strength Structural Materials,Central South University,China()
出版年
2024
NETL
NSTL
维普
万方数据