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合金元素对70%SiCp/Al复合材料钎料性能的影响

李娟, 王克鸿, 张德库

李娟, 王克鸿, 张德库. 合金元素对70%SiCp/Al复合材料钎料性能的影响[J]. 焊接学报, 2015, 36(10): 73-76,104.
引用本文: 李娟, 王克鸿, 张德库. 合金元素对70%SiCp/Al复合材料钎料性能的影响[J]. 焊接学报, 2015, 36(10): 73-76,104.
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LI Juan, WANG Kehong, ZHANG Deku. Effect of alloying elements on filler metal for brazing of 70% SiCP/Al composites[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(10): 73-76,104.
Citation: LI Juan, WANG Kehong, ZHANG Deku. Effect of alloying elements on filler metal for brazing of 70% SiCP/Al composites[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(10): 73-76,104.
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合金元素对70%SiCp/Al复合材料钎料性能的影响

  • 南京理工大学 材料科学与工程学院, 南京 210094

基金项目: 兵器预研支撑基金资助项目(62201070813);江苏省自然科学基金(BK20131261);江苏省科技资助项目(BE2011194);南京理工大学科研创新计划项目

Effect of alloying elements on filler metal for brazing of 70% SiCP/Al composites

  • School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

摘要

    摘要
  • 摘要: 采用正交试验法,研究了Cu,Si,Mg以及Ni元素的含量变化对Al-Cu-Si-Mg-Ni钎料熔点、润湿性的影响规律,并通过扫描电镜观察分析了钎料的显微组织. 结果表明,影响钎料熔点的三个主要因素依次为:Mg元素的含量、Al-Cu-Si三元共晶反应程度和Ni元素的含量. 随着镁含量增加,钎料的熔点降低,润湿性提高,但过量的镁使焊缝凝固后组织疏松. 当镁含量一定时,η≈(Si/Cu)/(Si+Cu)与0.06越接近则三元共晶反应进行程度越大,钎料熔点越低. 当Mg元素的含量和Al-Cu-Si三元共晶反应程度一定时,镍含量增加,钎料熔点降低. 在焊缝组织方面,沿晶界析出的粗大的块状硅相会增大接头脆性;在部分区域偏聚的Si元素,形成富硅相,在其周围常有气孔形成;弥散分布的白亮色针状θ(CuAl2)相也会在一定程度上降低接头性能;而具有面心立方结构的α固溶体(Al-Cu固溶体、Al-Cu-Si固溶体和Al-Si固溶体)基体则使钎料具有优良的力学性能.
    Abstract: The content of Cu, Si, Mg and Ni was changed by using orthogonal experiment in order to study how the content effected on the melting point and wettablity of Al-Cu-Si-Mg-Ni filler metal. The microstructure of the filler metal was analyzed by SEM and EDS. There were three factors affecting the melting point of filler metal, namely, the content of Mg element, the Al-Cu-Si eutectic reaction and the content of Ni element in proper order. With increasing of Mg content, the wettability was improved, but excess Mg led to the increase of porosity when the Mg content was constant, the closer the ratio of (Si/Cu) to (Si+Cu) to 0.06 was, the more Al-Cu-Si eutectic reaction occured. When the Mg content and Al-Cu-Si eutectic reaction were constant, the melting point decreased with the addition of Ni. Coarse blocky Si phase generated along grain boundaries could induce the joint brittle. Pore was built up around silicon-rich phase which was generated in a few areas as a result of Si segregation. Dispersed white needles θ(CuAl2) phase also decreased the strength of welding joint to some extent. However, α solid solution(Al-Cu、Al-Cu-Si and Al-Si)with face-centered cubic structure improved mechanical properties of the filler metal.
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    • 参考文献(11)
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  • 收稿日期:  2014-12-18

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