摘要
采用旋铸急冷工艺直接在大气环境中获得了具有良好韧性的Al_(87)RE_8Ni_5和Al_(92)RE_4Ni_4(at.-%)非晶合金,并对其显微结构及热稳定性进行了分析。结果表明,当急冷条带的厚度为50—60μm时,Al_(87)RE_8Ni_5条带为单一的非晶结构;而Al_(92)RE_4Ni_4条带包括贴辊面区的非晶结构、中心区的“非晶+微晶”和自由表面区的微晶组织。非晶Al_(87)RE_8Ni_5和Al_(92)RE_4Ni_4中的非晶结构都具有高的热稳定性,过冷液体存在温度区间(T_x-T_g)分别为53和83K;并且其玻璃形成能力参量T_g/T_m分别为0.56和0.59。
Al_(87)RE_8Ni_5 and Al_(92)RE_4Ni_4 (at.-%) amorphous alloys with superior bending
ductility were produced by melt-spinning in air atmosphere. For the ribbons obtained in 50-
60 μm thick, the Al_(87)RE_8Ni_5 alloy was found to be an amorphous structure with no trace of
crystallinity; whereas, Al_(92)RE_4Ni_4 alloy to be an amorphous phase in the wheel side, an
amorphous structure containing finely dispersed α-Al particles, about 5 nm in diameter, in
the ribbon core, and a-Al micrograins structure, with the grain size of 15-25 nm, in the free
side. Amorphous Al_(87)RE_8Ni_5 and Al_2RE_4Ni_4 alloys all possess a very wide temperature span
of the supercooled liquid, △T_x=53 and 83 K respectively, and a distinct glass transition abili-
ty with T_g / T_m=0.56 and 0.59 respectively.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第1期B027-B031,共5页
Acta Metallurgica Sinica
关键词
显微结构
热稳定性
铝稀土合金
rapid solidification
amorphous phase
thermal stability
microstructure
Al-RE-Ni alloy
