摘要
采用单辊旋淬技术制备快速凝固Al87Ni10 Zr3 合金。利用X -射线衍射、透射电子显微镜分析研究了合金薄带的急冷态和各退火态的显微组织。结果表明 :急冷态组织为非晶态和纳米晶的复合体 ,晶态组织是细小的Al基固溶体 (60～ 80nm)和Al3 (Ni ,Zr)相 (<2 0nm) ,非晶的形成取决于合金成分和凝固速率。低温 (2 0 0℃ )退火导致了非晶的晶化 ;高温 (3 5 0℃ ,2h)退火 ,过饱和Al基固溶体和Al3 (Ni ,Zr)相将析出或转变为亚稳L12 -Al3 Zr和Al3 Ni相 ,L12 -Al3 Zr相尺寸非常细小 (<2 0nm) ,退火时间达到 2 0h ,L12-Al3 Zr相尺寸仍无明显变化 。
Rapidly solidified Al 87 Ni 10 Zr 3 alloy was prepared by single roller melt spinning. As spun and as annealed state, the microstructure of the ribbons was examined by X ray diffraction(XRD) and transmission election microscopy(TEM). It was shown that the as spun alloy consisted of amorphous state and crystallized grains containing fine aluminum solid solution(60～80 nm in size) and Al 3(Ni,Zr) phase(<20 nm in size). The formation of amorphous state depended on composition and solidification velocity. Low temperature(200 ℃) heat treatment led to crystallization of amorphous. At higher temperature(350 ℃ at 2 hours), the super saturated solid solution Al precipitated and Al 3(Ni,Zr) phase transformed to a metastable L 12 Al 3Zr phase, less than 20 nm in size, which was found to be very stable even up to 20 hours at 350 ℃.
出处
《矿冶工程》
CAS
CSCD
北大核心
2002年第1期98-100,共3页
Mining and Metallurgical Engineering
基金
安徽省教委自然科学基金项目 (2 0 0 0j1 1 72 )
