CAJ | 학술논문

采用重力铸造法制备不同过剩硅含量的原位Mg2 Si/Al复合材料,研究过剩硅含量对Mg2 Si/Al复合材料组织和耐磨性的影响。结果表明：随着过剩硅含量、磷加入量的增加,初生Mg2 Si的体积分数增加,尺寸却减小；初生硅的体积分数随过剩硅含量的增加而增加；当过剩硅的含量增加到16%时,初生硅的平均尺寸没有发生明显变化,规则生长的α-Al树枝晶不断破裂,变得圆整；初生硅依附或包围初生Mg2 Si生长。当初生Mg2 Si和初生硅同时存在时,磷对初生Mg2 Si的变质效果优于其对初生硅的变质效果。干滑动试验发现,在恒定的载荷、滑动速率以及磨损距离下,随着过剩硅含量的增加,Mg2 Si/Al复合材料的磨损失重逐渐减小。
채용중력주조법제비불동과잉규함량적원위Mg2 Si/Al복합재료,연구과잉규함량대Mg2 Si/Al복합재료조직화내마성적영향。결과표명：수착과잉규함량、린가입량적증가,초생Mg2 Si적체적분수증가,척촌각감소；초생규적체적분수수과잉규함량적증가이증가；당과잉규적함량증가도16%시,초생규적평균척촌몰유발생명현변화,규칙생장적α-Al수지정불단파렬,변득원정；초생규의부혹포위초생Mg2 Si생장。당초생Mg2 Si화초생규동시존재시,린대초생Mg2 Si적변질효과우우기대초생규적변질효과。간활동시험발현,재항정적재하、활동속솔이급마손거리하,수착과잉규함량적증가,Mg2 Si/Al복합재료적마손실중축점감소。
In-situ Mg2 Si/Al composites with different extra Si contents were successfully synthesized by gravity casting technique. The effects of extra Si content on microstructures and wear resistance of Mg2 Si/Al composites were studied. The results show that:with increasing of content of extra Si and P,the number of primary Mg2Si increased and the size became smaller, at the same time, the number of primary silicon increased. When the content of extra Si was 16%,the average size of primary silicon remained unchanged. The morphology of α-Al changed from dendrite to broken dendrite and became gradually round. Some primary Mg2 Si particles were clung or wrapped up by primary Si. In addition, the wear test results showed that the wear volume decreases with increasing the fractions of extra Si at a constant sliding distance,sliding speed and applied load.