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| Study on Structure and Strength of NbMoTaTi Refractory High Entropy Alloy Fabricated by Laser Cladding Deposition |
| LI Qingyu1, LI Dichen1, ZHANG Hang1, ZHANG Anfeng1, LIANG Jingyi2, WANG Xinglixiang1, YAN Haoqi1 |
1. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2.State Key Laboratory for Mechanical Behavior Materials, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract The paper is to prepare the refractory high entropy alloy, NbMoTaTi, in aerospace industry by laser cladding deposition technology. The crystal structure of the alloy is single phase solid solution structure of BCC analyzed by Xray diffraction. The grain size of the NbMoTaTi high entropy alloy is mostly between 2-12μm. The average micro-hardness is 397.6HV and the room temperature compression strength is 1301.83MPa. The high temperature compression strength under 1000℃ is only 347.28MPa because of the defects such as pores, without /incomplete melting Ta powder particles and cracks generated during the forming process of NbMoTaTi high entropy alloys, so further research is needed.
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2018, 
