Preparation and mechanical properties of TiC_x-(NiCu)₃Al-CuNi₂Ti-Ni hybrid composites by reactive pressureless sintering pre-alloyed Cu/Ti₃AlC₂ and Ni as precursor

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• 作者：Wenjuan Wang^a ; Hongxiang Zhai^a ; ^{hxzhai@sina.com" class="auth_mail" title="E-mail the corresponding author} ; Lulu Chen^a ; Zhenying Huang^a ; Guoping Bei^b ; ^{bgp512@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Peter Greil^b
• 关键词：Hybrid composites ; Max phases ; Ultrafine TiCx ; Hardness ; Compressive behaviour
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：18 July 2016
• 年：2016
• 卷：670
• 期：Complete
• 页码：351-356
• 全文大小：1896 K

文摘

Ni based hybrid composites were fabricated from Ni/Cu/Ti₃AlC₂ powder mixtures. After pressureless sintering, almost fully dense TiC_x-(NiCu)₃Al-CuNi₂Ti-Ni hybrid composites were obtained and the in situ formed ultrafine TiC_x grains were homogeneously distributed in the metal matrix. The as prepared hybrid composites exhibited superior mechanical properties due to precipitation of submicron sized TiC_x and (NiCu)₃Al particles homogeneously dispersed in the matrix. The hardness, yield stress and ultimate compressive strength of the hybrid composites fabricated from 3.5Ti₃AlC₂/15.1Cu/81.4Ni reactant mixture attained mean values 2.66±0.10 GPa, 837±36 MPa and 1123±15 MPa, respectively. The enhancement of the mechanical properties was attributed to a size dependent particle strengthening mechanism as well as formation of large amount of dimples.