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原位自生TiB2-AlSi10Mg激光选区熔化及其高温性能研究
Selective Laser Melting of In-situ TiB2 Reinforced AlSi10Mg Composite and Its High Temperature Properties
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- DOI:
- 作者:
- 夏存娟 廉清 陈映言 王浩伟
XIA Cunjuan;LIAN Qing;CHEN Yingyan;WANG Haowei
- 作者单位:
- 上海交通大学材料科学与工程学院
School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
- 关键词:
- 激光选区熔化(SLM) TIB2 铝基复合材料 AlSi10Mg 高温性能
selective laser melting(SLM) TiB2 Aluminum matrix composite AlSi10Mg high temperature properties
- 摘要:
- 采用激光选区熔化(SLM)制备得到原位自生TiB2-Al Si10Mg复合材料,探索TiB2颗粒对其微观组织和高温力学性能的影响。结果表明,TiB2颗粒均匀分布在基体中,Si呈细小的网格状弥散分布;晶粒大多为细小的等轴晶,没有明显择优取向,平均晶粒尺寸为1.4μm。在350℃高温拉伸条件下,SLM成形TiB2-Al Si10Mg复合材料真实抗拉强度为123.0 MPa,断后伸长率为28.0%;变形机制主要为晶界滑动,并伴随着少量的位错滑动和攀移。The in-situ TiB2-AlSi10 Mg composite was prepared by laser selective melting(SLM),and the effect of TiB2 particles on the microstructure and mechanical properties at high temperature was investigated.The results show that TiB2 particles are uniformly distributed in the matrix and Si is distributed in a fine gridded manner.The grains are mostly fine equiaxed grains with no obvious preferred orientation,and the average grain size is 1.4μm.At 350℃,the real tensile strength of SLM formed TiB2-AlSi10 Mg composite was 123.0 MPa,and the elongation after fracture is 28.0%.The deformation mechanism is mainly grain boundary sliding accompanied by a small amount of dislocation sliding and climbing.