摘要
采用自蔓延燃烧反应法制备了一种新型Al-5Ti-0.8C中间合金,在此基础上采用不同含量(0%,0.1%,0.3%,0.5%,质量分数,下同)的中间合金对Al-Cu-Mn合金进行变质处理,研究该中间合金及其含量对Al-Cu-Mn合金组织形貌和高温力学性能的影响。结果表明:新型Al-5Ti-0.8C中间合金能够显著细化Al-Cu-Mn合金的晶粒尺寸,提高合金热处理过程中θ′(Al2Cu)相的析出密度,且细化析出相尺寸。其次,变质处理后合金的高温抗拉伸强度显著提高,且随着温度升高,抗拉伸强度的下降程度减小,主要原因在于变质处理后合金中析出均匀分布的细小θ′(Al2Cu)相以及热稳定性高的Al3(Ti,Zr)纳米颗粒。此外,当Al-5Ti-0.8C中间合金含量为0.3%时,Al-CuMn合金的组织形貌和高温力学性能最优。
A new kind of Al-5Ti-0.8C master alloy was fabricated using a self-propagating combustion reaction method and dilution treatment,and the effects of different Al-5Ti-0.8C master alloy contents(0 wt%,0.1 wt%,0.3 wt%,0.5 wt%)on the microstructure and elevated temperature mechanical properties of Al-Cu-Mn alloy were investigated.The results show that the Al-5Ti-0.8C master alloy refines the Al-Cu-Mn alloy,increases the amount ofθ′(Al2Cu)precipitates,and reduces their size during heat treatment,resulting in the grain refinement.Moreover,this new master alloy obviously improves the elevated temperature mechanical properties of Al-CuMn alloy,mainly due to the precipitation strengthening caused by the uniform distribution of second phases and fineθ′(Al2Cu)precipitates,and the formation of Al3(Ti,Zr)nanoparticles with high thermal stability.Furthermore,the microstructure and mechanical properties of Al-Cu-Mn alloy with 0.3 wt%Al-5Ti-0.8C master alloy show the optimal status.
作者
张国伟
牛经纬
徐宏
贾红敏
Zhang Guowei;Niu Jingwei;Xu Hong;Jia Hongmin(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第7期2321-2328,共8页
Rare Metal Materials and Engineering
基金
Applied Basic Research Project of Shanxi Province,China(201801D121111)。
