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The evolution of microstructure in Cu-8.0Ni-1.8Si-0.15Mg alloy during aging

机译:Cu-8.0Ni-1.8Si-0.15Mg合金时效过程中组织的演变

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摘要

The microstructure of precipitates in Cu-8.0Ni-l.8Si-0.15Mg (wt.%) alloy with super-high strength and high electrical conductivity was investigated by transmission electron microscope and selected-area electronic diffraction. The sequence of phase transformation in the alloy with aging time is that: spinodal decomposition + ordering(β-Ni_3Si)->-ordering(β-Ni_3Si) + δ-Ni_2Si→δ-Ni2Si + β-Ni_3Si. And the relationship between the matrix and precipitates is that: (11 0)_m//(l10)_β//(211)_δ, [112]_m//[l12]_β//[324]_δ. Spinodal decomposition, ordering ((β-Ni_3Si) and precipitates (β-Ni_3Si + δ-Ni_2Si) are attributed to the strengthening during aging, whose multiple interactions results in the variation of micro-hardness. After solution treatment at 970 ℃ for 6h, cool rolled by 50%, and aged at 450℃ for 180min, the Cu-8.0Ni-l.8Si-0.15Mg alloy has an average tensile strength of 1005 MPa, 0.2% proof strength of 768 MPa, elongation of 5.6% and an average electrical conductivity of 31.5.0% IACS. The morphology of the fracture surface of the alloy contains shallow dimple and quasi-cleavage pattern.
机译:通过透射电子显微镜和选择区域电子衍射研究了具有超高强度和高电导率的Cu-8.0Ni-1.8Si-0.15Mg(wt。%)合金中析出物的微观结构。合金随时效时间的相变顺序为:旋节线分解+有序(β-Ni_3Si)->有序(β-Ni_3Si)+δ-Ni_2Si→δ-Ni2Si+β-Ni_3Si。并且基体与沉淀物之间的关系是:(11 0)_m //(110)_β//(211)_δ,[112] _m // [12]_β// [324]_δ。旋节线的分解,有序化((β-Ni_3Si)和沉淀物(β-Ni_3Si+δ-Ni_2Si)归因于时效过程中的强化,其多重相互作用导致显微硬度的变化。在970℃固溶处理6h后, Cu-8.0Ni-1.8Si-0.15Mg合金冷轧50%,在450℃时效180min,平均抗拉强度为1005 MPa,0.2%屈服强度为768 MPa,延伸率为5.6%,合金的平均电导率为31.5.0%IACS,合金的断裂表面形态为浅凹痕和准解理图案。

著录项

  • 来源
    《Materials Science and Engineering》 |2010年第25期|p.6728-6733|共6页
  • 作者单位

    School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    rnSchool of Materials Science and Engineering, Central South University, Changsha 410083, China Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China Central South University, School of Materials Science and Engineering, LuShan Road, Changsha, Hunan 410083, China;

    rnSchool of Materials Science and Engineering, Central South University, Changsha 410083, China Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China;

    rnSchool of Materials Science and Engineering, Central South University, Changsha 410083, China;

    rnDepartment of Engineering, University of Liverpool, Liverpool L69 3GH, UK;

    rnSchool of Materials Science and Engineering, Central South University, Changsha 410083, China;

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

    Cu-Ni-Si alloy; microstructure; spinodal decomposition; ordering; precipitation;

    机译:铜镍硅合金;微观结构旋节线分解;订购沉淀;

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