Growth mechanism of primary Ti_(5)Si_(3) phases in special brasses and their effect on wear resistance  

作　　者：Xianlong Wang Jinchuan Jie Shichao Liu Zhuangzhuang Dong Guomao Yin Tingju Li 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian,116024,China

出　　处：《Journal of Materials Science & Technology》2021年第2期138-146,共9页材料科学技术（英文版）

基　　金：supported financially by the National Key Research and Development Program of China(Nos.2018YFE0306103 and 2017YFB0306105);the National Natural Science Foundation of China(Nos.51771040,51690163 and51525401);The Science and Technology Innovation Project of Ningbo(No.2018B10030)。

摘　　要：In the present work, in-situ Ti_(5)Si_(3) reinforced special brasses were prepared by melt reaction method. The synthesized Ti_(5)Si_(3) phase shows various morphologies in brasses with different Ti_(5)Si_(3) content, and the3 D morphological evolution of primary Ti_(5)Si_(3)and its growth mechanism were investigated. The Ti_(5)Si_(3) crystal, which bears D8_(8) hexagonal crystal structure, grows along <0001> direction and is revealed by{1010} faces during growth. With the increase of Ti_(5)Si_(3) content in the brasses, the morphology of primary Ti_(5)Si_(3)significantly changes from fibers to hexagonal prisms to short-rods with hollow. In addition,the influence of Ti_(5)Si_(3) volume fraction and morphology on the wear behavior of special brass was also revealed. It was substantiated that the wear resistance increases with the increasing volume fraction of Ti_(5)Si_(3), and the corresponding wear mechanism changes from delamination to slight adhesive wear and abrasive wear. However, the friction coefficient shows an abnormal increase when most of the Ti_(5)Si_(3) containing hollows appears in the brass. That is mainly due to the fact that the Ti_(5)Si_(3) is easier to break and fall off resulted by the hollow as a crack source, which makes it unable to resist the plastic deformation of the contact surface during the sliding.

关 键 词：Ti_(5)Si_(3) BRASS Morphology Growth mechanism Wear behavior 

分 类 号：TG146.11[一般工业技术—材料科学与工程]