标题:Effect of carbon reactant on microstructures and mechanical properties of TiAl/Ti2AlC composites
作者:Song, Xiaojie ;Cui, Hongzhi ;Han, Ye ;Hou, Nan ;Wei, Na ;Ding, Lei ;Song, Qiang
作者机构:[Song, Xiaojie ;Cui, Hongzhi ;Han, Ye ;Hou, Nan ;Wei, Na ;Ding, Lei ;Song, Qiang ] School of Materials Science and Engineering, Shandong University of 更多
通讯作者:Cui, Hongzhi
来源:Materials Science and Engineering A
出版年:2017
卷:684
页码:406-412
DOI:10.1016/j.msea.2016.12.069
摘要:TiAl/Ti2AlC composites were successfully synthesized by vacuum arc melting with TiC, graphite powder, and carbon nanotubes (CNTs) as carbon sources. As the amount of Ti2AlC ceramic increased, the microhardness and compressive strength of the TiAl/Ti2AlC composites improved linearly. Importantly, the TiAl/Ti2AlC prepared with TiC as the carbon source exhibited higher microhardness and compressive strength than that composites prepared with graphite powder or CNTs. During vacuum arc melting, three reactions occur successively: Ti+Al→TiAl, Ti+C→TiC, and TiAl+TiC→Ti2AlC. Ti2AlC was formed by peritectic reaction between the TiAl melt and TiC particles. A large amount of TiC was left in the TiAl matrix, which acted to improve the hardness and strength of the composites. The fracture behavior of the composite was mainly transgranular fracture. The pinning, pulling out, and the effect of crack deflecting of TiC particles, together with the interlayer tearing, plastic shearing, folding, and crimping of Ti2AlC played a key role in the improvement of the strength and plasticity of the composites.
© 2016 Elsevier B.V.
收录类别:EI
资源类型:期刊论文
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