摘要
采用X射线衍射结合ICDS对AA1235铝合金铸轧板及冷轧高温退火的第二相进行分析,并采用配有能谱仪的扫描电镜研究了板材不同状态的第二相尺寸、形貌及分布特点,探讨了高温中间退火对第二相粒子分布及转变的影响。结果表明:铸轧态的第二相在厚度方向分布具有不均匀性,表层附近主要为α-FeSiAl,越靠近中心层,Al-FeAlm/6/x共晶相越多,并发现少量β-FeSiAl;高温中间退火时发生了FeAlm/6/x→FeAl3,α-FeSiAl→FeAl3的相变,βp-FeSiAl溶解于Al基体中,伴随以上过程,Si元素固溶进Al基体中;高温退火前的冷轧变形加速了FeAl3的析出,有利于改善组织的不均匀性。
The second phase particles in cast-rolling and high temperature annealing samples of AA1235 aluminum alloy were investigated by XRD and ICDS. The morphology, composition and distribution of second phase particles of plate as well as the influence of high temperature annealing on the evolution and distribution of second phase particles were studied by SEM equipment with energy distribution spectrum （EDS）. The results show that the distribution of intermetallic phase particles along the thickness direction is heterogeneous, i.e., intermetallic phase particles in surface are mainly a-FeSiA1 and in center are mainly eutectic A1-FeAlr and few β-FeSiA1. During annealing at elevated temperature, phase transformations like FeAlr→FeA13, a-FeSiA1→FeA13 occurs and βp-FeSiA1 dissolves into A1 matrix. Moreover, Si element also dissolves in AI matrix. Cold rolling before high temperature annealing can promote the precipitation of FeA13, leading to a homogeneous distribution of intermetallic phase particles.
出处
《热加工工艺》
CSCD
北大核心
2013年第2期140-144,147,共6页
Hot Working Technology
基金
国家重点基础研究计划资助项目(2012CB619500)
关键词
AA1235
铸轧铝板
中间退火
第二相
AA1235
continuous cast aluminum strip
intermediate annealing
second phase
