熔体过热对Bi-Sb20合金熔体结构转变和退火稳定性的影响  

Effect of melt overheating on structural transition and annealing stability of Bi-Sb20 alloy

作　　者：陆峰 LU Feng(Department of Mechanical and Electrical Engineering,Huaibei Vocational and Technical College,Huaibei 235000,China)

机构地区：[1]淮北职业技术学院机电工程系

出　　处：《吉林师范大学学报（自然科学版）》2019年第3期30-34,共5页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(51101067)

摘　　要：熔体过热处理可以使熔体微结构发生转变,进而改变凝固后的组织和性能.以Bi基二元合金Bi-Sb20为研究对象,对合金Bi-Sb20分别进行700℃、900℃恒温熔体过热处理,通过测量熔体的电阻率随时间的变化曲线来研究熔体结构的转变.实验中发现Bi-Sb20合金熔体的结构转变存在一个临界温度,超过临界温度熔体合金的组织结构会发生变化,金相实验显示Bi-Sb20合金在经过900℃熔体过热处理后晶粒显著细化.但是对比700℃熔体过热处理、凝固后250℃退火处理和900℃熔体过热处理、凝固后250℃退火处理,实验结果表明900℃熔体过热处理后再进行合金退火后反而晶粒变大,且组织结构不稳定.因此经过熔体过热处理晶粒已经细化的合金不需再进行退火处理.该研究为有效开发利用过热处理工艺改变Bi-Sb20合金的结构和性能提供一定的实验依据.The proper melt overheating can improve the microstructures and the properties of some alloys.In order to measure time-dependent resistivity curves to reflect the melt structure,the melt overheating was treaded for the Bi-Sb20 alloy,respectively 700 ℃ and 900 ℃.It was found that the melt structure of Bi-Sb20 alloy had a critical temperature in the experiment.And the microstructure of the alloy was changed before and after the critical temperature.The grains of Bi-Sb20 alloy were refined after 900 ℃ melt overheating treatment.It were compared between the melt overheating treatment and 900℃ and 700℃ of melt overheating treatment Bi-Sb20 alloy annealing organization.The research results showed found that 900 ℃ melt overheating treatment of alloy structure stability was poorer.Alloys treated with melt overheating did not require annealing to refine the grain size.This study provided a scientific basis for the effective development and utilization of overheating treatment process to change the structure and properties of Bi-Sb20 alloy.

关 键 词：熔体过热 退火 熔体结构 Bi-Sb20合金 

分 类 号：O766.1[理学—晶体学] O792