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张建飞,郝文纬,徐鹏飞,董悦雷,张宇昊.电弧熔炼态NiAl-39V共晶合金的组织及力学性能[J].稀有金属材料与工程(英文),2019,48(5):1523~1528.[ZHANG Jianfei,HAO Wenwei,XU Pengfei,Dong Yuelei and ZHANG Yuhao.Microstructure and performance of NiAl-39V Eutectic Alloy prepared by Arc melting[J].Rare Metal Materials and Engineering,2019,48(5):1523~1528.]
Microstructure and performance of NiAl-39V Eutectic Alloy prepared by Arc melting
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Received:April 02, 2018  Revised:April 11, 2018
Key words: Eutectics  Room temperature fracture toughness  High temperature strength  Constitutive equation
Foundation item:国家自然科学(No.51564041);内蒙古自然科学(No.2014MS0518);内蒙古科技大学产学研培育(No.PY201509);内蒙古科技大学材冶学院青年人才项目(No.2014CY012)
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ZHANG Jianfei,HAO Wenwei,XU Pengfei,Dong Yuelei and ZHANG Yuhao  
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      SNi-30.5Al-39V (at%) alloy is prepared by vacuum non-consumable arc meltingSin this paper.The phase composition and morphology of the alloy at different solidification positions were analyzed by optical microscopy (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM).And the results show that the solidification structure of Ni-30.5Al-39V(at%) is composed of NiAl+V sheet eutectic.Through the test of fracture toughness and high temperature compression, the results show that the fracture toughness of NiAl-39V alloy is three times that of NiAl alloy, and crack deflection and crack bonding are the main toughening mechanisms.Finally, based on the Arrhenius model, the constitutive relation of NiAl-39V alloy was constructed as ε = 5.398×[sinh(0.037128σ)]2.3exp(-109.95×103/RT) and the activation energy was 109.95 kJ?mol-1. Keywords: Eutectics; Room temperature fracture toughness; High temperature strength; Constitutive equation