Sn对铜合金激光选区熔化微熔池组织及性能的影响  

Effect of Sn Content on Micro Molten Pool Microstructure and Mechanical Properties of Selective Laser Melted Cu Alloys

作　　者：李小璇 王曾洁[1] 贺定勇[1] 潘润蓬 刘轩 薛济来[2] LI Xiao-xuan;WANG Zeng-jie;HE Ding-yong;PAN Run-peng;LIUXuan;XUE Ji-lai(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《有色金属（冶炼部分）》2021年第5期92-96,111,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：北京市教委科技计划资助项目(KM201910005010);中央高校基本科研业务费专项资金资助项目(FRF-UM-15-049)。

摘　　要：优化激光选区熔化(SLM)功率、扫速、扫描间距参数调控策略,使Cu-5%Sn、Cu-15%Sn和Cu-24.6%Sn(质量分数)合金成形致密度分别达99.2%、99.7%和99.7%。发现该SLM成形凝固相转变行为与显微组织均有非平衡凝固特征,α相Cu-5%Sn合金中主要为α-Cu(Sn)固溶体相,α相Cu-15%Sn合金中为α-Cu(Sn)与δ-Cu41Sn11两相,β相Cu-24.6%Sn合金中β相不完全分解而析出γ与δ相。Sn含量由5%增至15%,抗拉强度由384 MPa增至695 MPa,但断裂总延伸率由22.7%降至12%,α相中未见明显择优取向,β相Cu-24.6%Sn合金中有织构与SLM堆积方向平行,拉伸性能呈现强各向异性。Selective Laser Melting(SLM)was used to prepare Cu-Sn alloys with optimized parameters such as laser power,scanning speed and hatching space and forming density of SLM built Cu-5%Sn,Cu-15%Sn and Cu-24.6%Sn(mass fraction)reaches 99.2%,99.7%,and 99.7%respectively.It is found that solidification phase transformation and microstructure show non-equilibrium characteristics.αphase Cu-5%Sn alloy contains mainlyα-Cu(Sn)solid solution phase,whileαphase Cu-15%Sn alloy is composed ofα-Cu(Sn)andδ-Cu41Sn11 phases,andβphase Cu-24.6%Sn alloy has partially decomposed toγandδphases.As Sn content rises from 5%to 15%,tensile strength increases from 384 MPa to 695 MPa,while fracture extension drops from 22.7%to 12%.No obvious preferred orientation exists inαCu-Sn alloys,while texture parallel to building direction of SLM appears inβCu-24.6%Sn alloy with strong anisotropy in tensile properties.

关 键 词：铜合金 有色金属 冶金熔池 激光选区熔化 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]