选区激光熔化制备原位TiN-Ti5Si3复合材料的显微组织
收稿日期: 2009-10-19
修回日期: 2010-03-11
网络出版日期: 2010-06-11
基金资助
德国洪堡基金项目和江苏省自然科学基金项目BK2009374 资助
MICROSTRUCTURES OF IN SITU TiN–Ti5Si3 COMPOSITES PREPARED BY SELECTIVE LASER MELTING
Received date: 2009-10-19
Revised date: 2010-03-11
Online published: 2010-06-11
Supported by
Supported by Alexander von Humboldt Foundation and Natural Science Foundation of Jiangsu Province (No.BK2009374)
利用高能球磨制备了Si3N4-Ti(摩尔比1∶9)纳米复合粉末, Si3N4和Ti平均晶粒尺寸均小于20 nm, 之后进行选区激光熔化成型,通过9Ti+Si3N4=4TiN+Ti5Si3反应生成TiN增强Ti5Si3基原位复合材料. 延长球磨时间, Si3N4-Ti复合粉末颗粒细化且比表面积增加,激光成型的TiN-Ti5Si3复合材料致密度可增至97.2%, 成型组织中TiN增强相形貌经历多棱角状→近圆形→枝晶状的转变.
关键词： TiN-Ti5Si3复合材料; 选区激光熔化; 显微组织
顾冬冬 , 沈以赴 . 选区激光熔化制备原位TiN-Ti5Si3复合材料的显微组织[J]. 金属学报, 2010 , 46(6) : 761 -768 . DOI: 10.3724/SP.J.1037.2009.00685
The selective laser melting (SLM) was used to process the high–energy ball milled Si3N4–Ti (mole ratio of 1∶9) nanocomposite powder in which the average grain sizes of Si3N4 and Ti were both less than 20 nm. The TiN reinfrced Ti5Si3 matrix in situ composites were prepard by means of the synthesis reaction 9Ti+Si3N4=4TiN+Ti5Si3 . s the milling time increased, thaverge particle size of te milled Si3N4–Ti composite powder decreased and the resultant specific surface area increased. The densification level of laser processed TiN–Ti5Si3 composites increased accordingly to 97.2%. The morphologies of TiN reinforcing phase in the corresponding SLM processed structures experienced a successive change from a poly–angular shape to a near–spherical shape and finally to a dendritic shape.
Key words： TiN–Ti5Si3 composites; selective laser melting; microstructure
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