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Fracture behavior and structural transition of Ni_(46)Mn_(33)Ga_(17)Cu_(4-x)Zr_x alloys

机译:Ni_(46)Mn_(33)Ga_(17)Cu_(4-x)Zr_x合金的断裂行为和结构转变

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摘要

This study investigated the fracture behavior and structural transition of Ni_(46)Mn_(33)Ga_(17)Cu_(4-x)Zr_x(x=0, 2, 4) alloys after undergoing quasi-static compression and ball milling. The introduction of Zr-rich second phase enhanced the compressive strength without improving the mechanical ductility of the alloys. The dispersed second phase formed weak interfacial bonding with the martensitic matrix, which resulted in the low plasticity. After ball milling, the dual phase alloy particles were separated to the second phase particles and the matrix phase particles. The average particle size was reduced with increasing Zr content since the size of the second phase particles was much smaller than that of the matrix particles. Moreover, the structure of the second phase was almost not changed by the ball milling. The martensitic transformation disappears for all the alloys after ball milling because of the disordering of the martensitic matrix. Post-annealing at 800 ℃ can restore the martensitic transformation of the Cu4 and Cu2Zr2 alloys but is not effective to restore that of the Zr4 alloy.
机译:本研究研究了Ni_(46)Mn_(33)Ga_(17)Cu_(4-x)Zr_x(x = 0,2,4)合金在经过准静态压缩和球磨后的断裂行为和结构转变。富Zr的第二相的引入提高了压缩强度,而没有改善合金的机械延展性。分散的第二相与马氏体基体形成较弱的界面键合,导致塑性低。球磨后,将双相合金颗粒分离为第二相颗粒和基质相颗粒。随着第二相颗粒的尺寸远小于基体颗粒的尺寸,平均颗粒尺寸随Zr含量的增加而减小。此外,球磨几乎不改变第二相的结构。球磨后,所有合金的马氏体相变都消失了,因为马氏体基体无序。在800℃下进行后退火可以恢复Cu4和Cu2Zr2合金的马氏体相变,但不能有效恢复Zr4合金的马氏体相变。

著录项

  • 来源
    《Materials Science and Engineering》 |2014年第23期|95-101|共7页
  • 作者单位

    Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;

    Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;

    Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;

    Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;

    Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China,Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;

    Chemical and Materials Engineering Department, University of Nevada, Reno, NV 89557, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ni-Mn-Ga alloys; Intermetallics; Mechanical properties; Microstructure; Phase transformation;

    机译:Ni-Mn-Ga合金;金属间化合物机械性能微观结构相变;

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