Ti-Si对SiCp/Al基复合材料等离子弧原位焊接性能的影响
Effects of Ti-Si on properties of plasma arc “in-situ” welding for SiCp/Al MMCs
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摘要: 以Ti-Si混合粉末作为填充材料,采用氮氩混合等离子气体对SiCp/Al基复合材料进行等离子弧原位焊接,分析SiCp/Al基复合材料的焊接性。结果表明,填充Ti-Si混合粉末进行等离子弧原位焊接时接头组织致密,结合较好,焊缝组织中生成了新的增强颗粒,未发现明显的针状相生成,从而有效地提高了接头的力学性能。力学性能试验表明,采用Ti-Si混合粉末进行等离子弧原位焊接所获得的抗拉强度为232.3 MPa。此外探讨了焊接接头中气孔形成的机制以及应采取的相应措施。
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关键词:
- SiCp/Al基复合材料 /
- 等离子弧 /
- 原位焊接 /
- Ti-Si混合粉末
Abstract: In order to analyze weldability of SiC particle reinforced aluminum metal matrix composites(SiCp/Al MMCs), plasma arc "in-situ" welding of SiCp/Al MMCs are carried out using argonnitrogen mixture as plasma gases and Ti-Si mixed powder as "in-situ" welded material.The results show that the dense metallurgical joining with obscure interface could be acquired by adding Ti-Si mixed powder into the pool and new composite reinforced are produced in the weld, and the needle-like phases are not found yet, ensuring the quality of joints.The mechanical testing results show that the maximum tensile strength obtained with Ti-Si mixed powder as "in-situ" material are 232.3 MPa.Furthermore the forming mechanism of porosity in welded joint and the corresponding measures are discussed.-
Keywords:
- SiCp/Al metal matrix composites /
- plasma arc /
- in-situ welding /
- Ti-Si
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