Al-Zr-Yb-Cr合金中的弥散相的形成与作用  

High Temperature Precipitation Hardening and Recrystallization of Al-Zr-Yb-Cr Alloys

作　　者：方华婵[1] 巢宏[2] 陈康华[1] 尚攀举[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]湖南省科学技术信息研究所,湖南长沙410001

出　　处：《稀有金属材料与工程》2015年第7期1689-1695,共7页Rare Metal Materials and Engineering

基　　金：中国博士后科学基金(2013M531810);中南大学博士后基金(109001);国家重点基础研究发展计划资助项目(2012CB619502;2010CB731701);国家自然科学基金委员会创新研究群体科学基金资助项目(50721003)

摘　　要：采用透射电镜研究了Al-Zr-Yb-Cr合金中析出的弥散相的形态、结构和成分,采用硬度和金相观察对比了弥散相在500℃的析出硬化作用及其稳定性,以及对合金再结晶的抑制作用。结果表明：Al-Zr-Yb-Cr合金经500℃均匀化处理后析出了大量共格的、L12结构（Al,Cr）3（Zr,Yb）弥散相,弥散相均匀化处理400 h仍保持共格态,粒径维持在15～25nm。其高温析出硬化及抑制铝基体再结晶作用优于Al3Zr和Al3（Zr,Yb）弥散相。The formation, precipitation-hardening behavior and recrystallization behavior of dispersoids in Al-Zr-Yb-Cr alloy were studied by optical microscopy（OM）, transmission electron microscopy（TEM） and microhardness measurements.By adding Zr, Yb and Cr in combination, coherent and well-dispersed L12-structured（Al, Cr）3（Zr, Yb） dispersoids of a relatively high density are uniformly precipitated during homogenization at 500 ℃.These dispersoids are coherent with the sizes remaining essentially 15～25 nm even after being exposed for 400 h.Its high-temperature stability and precipitation-hardening effects and ability on inhibiting recrystallization of Al are significantly better than Al3 Zr and Al3（Zr,Yb） dispersoids.

关 键 词：弥散相 析出硬化 再结晶 

分 类 号：TG146.21[一般工业技术—材料科学与工程]