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铜锡合金激光选区熔化非平衡凝固组织与性能

李小璇 王曾洁 贺定勇 刘轩 薛济来

李小璇, 王曾洁, 贺定勇, 刘轩, 薛济来. 铜锡合金激光选区熔化非平衡凝固组织与性能[J]. 工程科学学报, 2021, 43(8): 1100-1106. doi: 10.13374/j.issn2095-9389.2020.10.29.006
引用本文: 李小璇, 王曾洁, 贺定勇, 刘轩, 薛济来. 铜锡合金激光选区熔化非平衡凝固组织与性能[J]. 工程科学学报, 2021, 43(8): 1100-1106. doi: 10.13374/j.issn2095-9389.2020.10.29.006
LI Xiao-xuan, WANG Zeng-jie, HE Ding-yong, LIU Xuan, XUE Ji-lai. Nonequilibrium solidification microstructures and mechanical properties of selective laser-melted Cu–Sn alloy[J]. Chinese Journal of Engineering, 2021, 43(8): 1100-1106. doi: 10.13374/j.issn2095-9389.2020.10.29.006
Citation: LI Xiao-xuan, WANG Zeng-jie, HE Ding-yong, LIU Xuan, XUE Ji-lai. Nonequilibrium solidification microstructures and mechanical properties of selective laser-melted Cu–Sn alloy[J]. Chinese Journal of Engineering, 2021, 43(8): 1100-1106. doi: 10.13374/j.issn2095-9389.2020.10.29.006

铜锡合金激光选区熔化非平衡凝固组织与性能

doi: 10.13374/j.issn2095-9389.2020.10.29.006
基金项目: 北京市教委科技计划资助项目(KM201910005010);国家自然科学基金资助项目(51674025);中央高校基本科研业务费专项资金资助项目(FRF-UM-15-049)
详细信息
    通讯作者:

    E-mail: wangzj@bjut.edu.cn

  • 中图分类号: TF801.1

Nonequilibrium solidification microstructures and mechanical properties of selective laser-melted Cu–Sn alloy

More Information
  • 摘要: 对具有重要工程应用价值的Cu‒5%Sn合金进行激光选区熔化(SLM)成形,在激光功率160 W、扫描速度300 mm·s−1、扫描间距0.07 mm条件下,合金样品相对密度可达99.2%,熔池层与层堆积密实,表面质量良好。研究发现所获合金具有非平衡凝固组织特征,其中以α-Cu(Sn)固溶体相为主,且涉及具有超结构的γ相、δ相。显微形貌主要由柱状晶与富锡网状组织构成,伴随有不同尺度界面Sn元素偏析及晶界、晶内纳米尺寸超结构合金相颗粒析出。所获合金的力学性能与同成分铸态合金或较低Sn含量SLM合金相比得到显著强化,表面硬度可达HV 133.83,屈服强度326 MPa,抗拉强度387 MPa及断裂总延伸率22.7%。

     

  • 图  1  SLM成形Cu‒5%Sn合金及表面光学显微观察。(a)SLM成形块体;(b)顶表面形貌;(c)侧表面形貌

    Figure  1.  Cu–5%Sn alloy prepared using the SLM technique and corresponding optical observation of the alloy surfaces: (a) SLM built block; (b) top surface image; (c) side surface image

    图  2  气雾化Cu‒5%Sn合金粉末与SLM成形合金X射线衍射图谱

    Figure  2.  X-Ray diffraction patterns for atomized prealloyed powder and as-built Cu–5%Sn

    图  3  SLM成形Cu‒5%Sn合金扫描电子显微分析。(a)横截面;(b)纵截面

    Figure  3.  Scanning electron microscopy (SEM) image of Cu–5%Sn alloy prepared using the selective laser melting technique: (a) transverse cross-section; (b) longitudinal cross-section

    图  4  铜锡二元合金平衡相图[22]及本文研究所获Cu‒5%Sn合金铸态组织

    Figure  4.  Cu–Sn equilibrium binary phase diagram and microstructure of as-cast Cu–5%Sn alloys

    图  5  SLM成形Cu‒5%Sn合金样品透射电子显微分析。(a)明场像;(b)选区电子衍射;(c)暗场像;(d)高角环形暗场像

    Figure  5.  Transmission electron microscopy (TEM) image of the Cu–5%Sn alloy fabricated using the selective laser melting technique: (a) bright field image; (b) selected area electron diffraction; (c) dark field image; (d) high angle annular dark field image

    图  6  α相、β相、γ相、δ相单胞(001)面示意图

    Figure  6.  Schematic of (001) faces for lattice of α, β, γ, and δ phases

    图  7  Cu‒5%Sn合金SLM成形样品准静态拉伸试验工程应力‒应变曲线图

    Figure  7.  Engineering stress–strain curves of the SLM-built Cu–5% Sn alloy using quasistatic tensile tests

    表  1  Cu‒5% Sn合金激光选区熔化成形参数与相对密度汇总

    Table  1.   Selective laser melting parameters and corresponding relative densities of as-prepared Cu–5% Sn alloys

    Experimental numberLaser power/
    W
    Scanning speed/
    (mm·s−1)
    Line spacing/
    mm
    Energy density/
    (J·mm−3)
    Relative density/%
    11203000.03666.6691.47
    21206000.05200.0090.77
    31209000.0795.2491.09
    41406000.07166.6695.77
    51409000.03259.2693.36
    61403000.05466.6696.34
    71603000.07380.9699.19
    81606000.03444.4496.28
    91609000.05177.7894.70
    R5.612.621.65
    下载: 导出CSV
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  • 收稿日期:  2020-10-29
  • 网络出版日期:  2020-12-22
  • 刊出日期:  2021-08-25

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