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Effect of mechanical alloying on microstructure and mechanical properties of hot-pressed Nb-16Si alloys

机译：机械合金化对热压Nb-16Si合金组织和力学性能的影响

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摘要

Nb-16at.% Si bulk alloys were fabricated by hot pressing from compound powders milled for different times. The influences of mechanical alloying on microstructure and mechanical properties of the hot-pressed alloys were investigated. The results indicate that the particle size of powders was significantly refined and the addition of absolute ethyl alcohol suppressed the agglomeration of powders. When milling time increased from 6 to 24h, the constituent phases (Nbss, Nb_5Si_3 and Nb_3Si) changed from large size trips to fine near-equiaxed shape, and the volume fraction of ductile Nbss decreased. In addition, Vickers hardness and flexural strength of bulk alloys increased gradually owing to the enhancement of the volume fraction of niobium silicides. Fracture toughness was in range of 10.98-13.23 MPa m~(1/2), which was higher than that of cast materials. It was attributed to the positive role of ductile phase and fine-grain toughening.
机译：Nb-16at。％Si块状合金是通过热压不同时间研磨的复合粉末制成的。研究了机械合金化对热压合金组织和力学性能的影响。结果表明，粉末的粒度显着细化，并且添加无水乙醇抑制了粉末的团聚。当铣削时间从6小时增加到24小时时，组成相（Nbss，Nb_5Si_3和Nb_3Si）从大尺寸行程转变为精细的近等形状，而延性Nbss的体积分数降低。另外，由于铌硅化物的体积分数的增加，块状合金的维氏硬度和抗弯强度逐渐增加。断裂韧性在10.98-13.23 MPa m〜（1/2）的范围内，高于铸造材料。这归因于韧性相和细晶粒增韧的积极作用。

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  • 来源
    《Materials Science and Engineering》 |2010年第14期|p.3253-3258|共6页
  • 作者

    X.L. Wang; G.F. Wang; K.F. Zhang;

  • 作者单位

    National Key Laboratory for Precision Heat Processing of Metal, Harbin Institute of Technology, 92 Southern Dazhi Street, Harbin 150001, PR China;

    National Key Laboratory for Precision Heat Processing of Metal, Harbin Institute of Technology, 92 Southern Dazhi Street, Harbin 150001, PR China;

    National Key Laboratory for Precision Heat Processing of Metal, Harbin Institute of Technology, 92 Southern Dazhi Street, Harbin 150001, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nb-based alloy; silicides; mechanical alloying; fracture toughness;

    机译：铌基合金;硅化物;机械合金化;断裂韧性;

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