原位自生TiB2/2014?Al复合材料挤压铸造  

Squeeze Casting of In-Situ TiB2/2014 Al Composite

作　　者：薛菁 王朦朦 王俊[1] 高海燕[1] XUE Jing;WANG Meng-meng;WANG Jun;GAO Hai-yan(Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, School of Materials Science andEngineering, Shanghai Jiao Tong University, Shanghai 200240, China)

机构地区：[1]上海市先进高温合金材料及其精密成型重点实验室上海交通大学材料科学与工程学院

出　　处：《铸造》2019年第7期723-729,共7页Foundry

基　　金：国家自然科学基金(51804198)

摘　　要：采用氟盐反应法制备了原位自生5vol.%TiB2/2014Al复合材料,研究了原位自生复合材料挤压铸造成形工艺,以及挤压铸造对复合材料组织和性能的影响。结果表明:挤压铸造能够制备合格的TiB2/2014复合材料薄壁铸件;相比2014Al基体合金,复合材料表现出较差的挤压铸造成形性;挤压铸造可减少铸造缺陷,细化基体组织,显著改善原位自生TiB2颗粒的分散性;与重力铸件相比,复合材料挤压铸件的力学性能显著提高。An in-situ 5vol.%TiB2/2014 composite was prepared by an exothermic reaction of K2TiF6, KBF4 and Al melt. The squeeze-casting formability of the composite was investigated. The effects of squeeze casting on the microstructure and mechanical properties of composite were discussed. The results show that squeeze casting could obtain the qualified 5vol.%TiB2/2014 composite thin-walled parts. However, the composite showed poor squeeze-casting formability compared with the 2014 Al matrix alloy. In addition, the squeeze casting was found to be very effective not only in reducing casting defects, refining the microstructure but also in improving the overall distribution of TiB2 particles in Al matrix. Compared with the gravity casting, the mechanical properties of squeeze cast composite were significantly increased.

关 键 词：原位自生 TiB2/2014Al复合材料 挤压铸造 成形性 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]