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电弧熔炼态NiAl-39V共晶合金的组织及力学性能
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内蒙古科技大学材料与冶金学院

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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)


Microstructure and performance of NiAl-39V Eutectic Alloy prepared by Arc melting
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College of Materials and Metallurgy, Inner Mongolia University of Science and Technology

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    摘要:

    本文采用真空非自耗电弧熔炼制备了Ni-30.5Al-39V(at%)合金,利用光学显微镜(OM),X射线衍射(XRD),扫描电镜(SEM)分析了合金不同凝固位置处的相组成和组织形态,结果表明Ni-30.5Al-39V(at%)的凝固组织由NiAl+V片层共晶组成。通过断裂韧性和高温压缩的测试,结果表明NiAl-39V合金的断裂韧性是NiAl合金的三倍,裂纹偏转和裂纹键合是其主要韧化机理。高温强度提升约2倍左右,复相强化和固溶强化是高温强度提升的主要原因。最后,基于Arrhenius模型构建NiAl-39V合金本构关系为ε = 5.398×[sinh(0.037128σ)]2.3exp(-109.95×103/RT),其激活能为109.95 kJ?mol-1

    Abstract:

    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

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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,2019,48(5):1523~1528.[ZHANG Jianfei, HAO Wenwei, XU Pengfei, Dong Yuelei, 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.]
DOI:10.12442/j. issn.1002-185X.20180317

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  • 收稿日期:2018-04-02
  • 最后修改日期:2018-04-11
  • 录用日期:2018-04-27
  • 在线发布日期: 2019-06-04
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