材料工程2018，Vol.46Issue(3)：98-104,7.DOI:10.11868/j.issn.1001-4381.2017.001122
稀土元素对原位合成TiB2/Al复合材料组织和性能的影响
Effect of Rare Earth Element on Microstructure and Properties of in situ Synthesized TiB2/Al Composites
摘要
Abstract
The effect of rare earth element Ce,Sc and Er on TiB2 particles and matrix alloy microstructure of TiB2/Al composites was studied with in situ synthesis method.It shows that the addition of rare earth element improves the microstructure and properties of TiB2/Al composites notably.The particles of TiB2 are relatively homogenously distributed as adding 0.3 ％ (mass fraction) rare earth element Sc and Er,moreover,it is Er that refines the microstructure of matrix alloy most significantly,then is Sc.Similarly,it is demonstrated that the addition of Sc and Er results in better tensile strength,which is enhanced by 32％ and 31％,respectively;the addition of Er also leads to the best ductility by 85％ with optimal tensile property.Meanwhile,fracture morphology analysis reveals that the fracture of the composites is microporous gathered ductile fracture when adding Sc and Er.Finally,it is verified that the mechanism of rare earth element on composites lies in two aspects:one is that the addition of rare earth element improves the wettability of the composites and suppresses the agglomeration of TiB2 particles;the other is that the addition of rare earth element refines the microstructure of matrix alloy and then improves the tensile strength of the composites.关键词
稀土元素/TiB2/Al复合材料/微观组织/拉伸性能/润湿性Key words
rare earth element/TiB2/Al composites/microstructure/tensile property/wettability分类
矿业与冶金引用本文复制引用
屈敏,刘鑫,崔岩,刘峰斌,焦志伟,刘园..稀土元素对原位合成TiB2/Al复合材料组织和性能的影响[J].材料工程,2018,46(3):98-104,7.基金项目
国家自然科学基金资助项目(51604012,51575004) （51604012,51575004）
北京市自然科学基金项目(3162010) （3162010）
北京市优秀人才培养项目(2014000020124G010) （2014000020124G010）
