摘要
分别采用传统水冷模铸锭和速凝铸片工艺制备了Nd12.6Fe81B6Ga0.4合金,研究了不同铸锭方式和热处理工艺对铸态合金微观组织的影响。研究发现,采用速凝工艺制备的铸片,其主相晶粒更加细小和均匀,增加冷却速度可有效抑制α-Fe的析出,铸片出现主相(00l)面平行于自由面的强烈择优取向。铸态合金经热处理后,主相晶粒长大,其中普通水冷铸锭比速凝铸片晶粒长大速率快。此外,微区成分分析显示,热处理时间对晶界相成分无显著影响,在晶界相中存在Ga的富集区。
Nd12.6Fe81B6Ga0.4 alloys were prepared by conventional book-mold casting （BMC） and strip cast-ing （SC） methods, respectively. The effects of cooling speed and heat treatment process on microstructure ofthe as-cast alloy were studied. It was found that the SC flakes had more uniform and finer grains, and increasing cooling speed could suppress the precipitation of α-Fe. Furthermore, there was a pronounced preferred orientation with （001） plane parallel to free face in SC flakes. After heat treatment, the grains grew,and the increase rate of grain size in BMC was much faster than that in SC with the increase of the treatment time. Moreover, composition analysis by EDS indicated that there was aggregation of Ga in the intergranular phase, and the composition of intergranular phase did not change by different heat treatment time.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2007年第5期610-614,共5页
Chinese Journal of Rare Metals
