Reactive Milling and Mechanical Properties of NiAl Composite with HfC Dispersoids

材料科学技术（英文）, 2002, 18(1): 59-62.

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1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaJiyang ZHO UMaterials department, Dalian University of Technology, Dalian 116024, China

2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaJiyang ZHO UMaterials department, Dalian University of Technology, Dalian 116024, China

3.Materials department, Dalian University of Technology, Dalian 116024, China

基金项目: 国家高技术研究发展计划(863计划)(863-715-005-0030) 国家自然科学基金(59895152)

Reactive Milling and Mechanical Properties of NiAl Composite with HfC Dispersoids

Keywords： NiAl composite

A NiAl-based composite with HfB2 dispersed particles has been synthesized by mechanical alloying of Ni, Al, Hfand C powders. The formation mechanism of NiAl-HfC during milling can be attributed to two chemical reactions:Ni+Al-→NiAl+△H; Hf+C→HfC+△H, induced by mechanical collision in a certain period of time, which results inan abrupt exothemic reaction. Hot pressing (HP) and hot isostatic pressing (HIP) have been used to make the NiAl-10HfC compacts near fully dense. Compressive testing from room temperature to 1000C indicated that the yieldstress of NiAl-10HfC composite is 3～4 times higher than that of cast NiAl and correspond to the MA NiAl-10TiB2composite. In the meantime, yield strength at high temperature is dependent on strain rate, and deformation iscontrolled by diffusion mechanism.

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Reactive Milling and Mechanical Properties of NiAl Composite with HfC Dispersoids

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