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Nb含量对机械合金化Cu-Nb合金晶粒细化和力学性能的影响
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中国计量大学材料科学与工程学院,中国计量大学材料科学与工程学院,中南大学

基金项目:

中国自然科学基金青年基金


Effect of Nb Solute Concentration on Crystallite Size Refinement and Strength Enhancement in Mechanical Alloyed Cu-Nb Alloys
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College of Materials Science and Engineering,China Jiliang University,College of Materials Science and Engineering,China Jiliang University,School of Materials Science and Engineering,Central South University

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    摘要:

    采用机械合金化法制备了Cu-xNb(x=0-30%)合金粉末,通过X射线衍射仪(XRD)、金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)观察和显微硬度测量分析了Nb溶质含量对粉末晶粒细化过程以及力学性能的影响。结果表明,尽管Nb与Cu的平衡固溶度接近为0,经100h球磨后,Nb在Cu中的最大固溶量可达约11wt%。随着Nb含量的增加,Cu-Nb合金粉末的晶粒细化能力提高。这是由于随着偏析至位错处的溶质原子数量增加,合金的回复过程得到抑制,因此有利于晶粒尺寸的减小。Cu-30wt%Nb合金球磨100h后Cu相平均晶粒尺寸减小至约6nm。此外,球磨Cu-Nb合金粉末的显微硬度随着Nb含量的增加而提高,其强化机制主要为细晶强化和固溶强化。

    Abstract:

    Cu-Nb alloys with Nb concentration ranging from 0-30wt% were prepared by mechanical alloying (MA) at room temperature. The effects of Nb content on the crystalline refinement process and mechanical property of the immiscible Cu-Nb system have been investigated by X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray detection, optical microscopy, transmission electron microscopy and microhardness measurement. It is found that the completed dissolution of Nb in Cu can be achieved in the samples with Nb content less than ~11wt% after 100 h milling, although the equilibrium solubility level is nearly zero. The grain size refinement capability of MA-ed Cu-Nb powders enhances with increasing Nb content up to 30wt%. This is because the susceptibility to recovery process becomes reduced, when the amount of Nb solutes segregated into the dislocation of Cu phase is increased. For the 100 h milled Cu-30wt%Nb powders, the average Cu grain size is only ~6nm. The microhardness of the samples shows an enhancement with increasing Nb concentration. The main strengthening mechanisms of the MA-ed Cu-Nb alloys are linked to the grain size reduction and the dissolution of Nb into Cu matrix.

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雷若姗,陈广润,汪明朴. Nb含量对机械合金化Cu-Nb合金晶粒细化和力学性能的影响[J].稀有金属材料与工程,2018,47(9):2607~2614.[Ruoshan Lei, Guangrun Chen, Mingpu Wang. Effect of Nb Solute Concentration on Crystallite Size Refinement and Strength Enhancement in Mechanical Alloyed Cu-Nb Alloys[J]. Rare Metal Materials and Engineering,2018,47(9):2607~2614.]
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  • 收稿日期:2017-02-27
  • 最后修改日期:2017-08-07
  • 录用日期:2017-08-16
  • 在线发布日期: 2018-11-01