摘要
研究了微量B2O3、超声处理对原位Mg2Si/AM60复合材料组织的影响。结果表明:随着B2O3加入量增加至0.60%(质量分数,下同)时,Mg2Si/AM60复合材料组织先逐渐细化后粗化,生成的Fe B减少了杂质Fe。当B2O3加入量为0.40%时,Mg2Si/AM60复合材料组织中的半连续网状Mg17Al12细化成颗粒状,粗大汉字状Mg2Si转变成细小的纤维状、颗粒状,其平均晶粒尺寸由未加入时的140μm细化至50μm,其细化程度主要与Al B2的异质形核密切相关;后续施加的600 W连续超声对熔体处理60 s,使得复合材料中的Mg17Al12、Mg2Si变得更加细小、均匀。
Effects of trace B2O3 and ultrasonic treatment on microstructures of in-situ Mg2Si/AM60 composites were investigated. The results show that microstructures of in-situ Mg2Si/AM60 composites become fine firstly, and then grow with increasing the content of B2O3 to 0.60%（mass fraction）. Meanwhile, impurity Fe is removed from melt by Fe B. Semi-continuous reticular Mg17Al12 phase transforms into granular, and coarser Chinese script type Mg2 Si phase transforms into fibrous and granular when adding 0.40% B2O3, whose average grain size decreases from 140 μm to 50 μm, and the refined effort is closely related to heterogeneous nucleation of Al B2 phase. The morphology of Mg17Al12 phase and Mg2 Si phase become finer and more uniform with ultrasonic treatment of 600 W power for 60 s.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第2期493-497,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51165032)
江西省教育厅资助(GJJ13203)
江西省高等学校科技创新团队资助(00008713)
党外专家博士产学研合作计划(2012-CYH-DW-XCL-002)
南昌市科技支撑计划(20110515090004398)
