高比分SiCp/2024铝基复合材料激光原位焊接头断裂行为
Welded joints fracture behavior of laser in-situ welding of high volume fraction SiCP/2024 Al MMC
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摘要: 以Ti-6Al-4V合金作为中间层对45%(体积分数)的SiCp增强铝基复合材料进行激光原位焊接,对比分析了不同焊接条件下的接头断裂行为.结果表明,钛夹层厚度为0.5 mm时,有利于获得成形良好、界面结合性紧密的接头.接头断裂位置位于焊缝中心,抗拉强度可达母材强度的50%,此时的断裂机制为准解理断裂;钛夹层厚度增加到0.8 mm时,焊缝中易出现气孔、未熔合缺陷,界面反应也不充分,接头断裂位置位于接头界面,抗拉强度较低,断裂机制多为脆性断裂.Abstract: High volume fraction(45%) SiCP/2024 aluminum matrix composite was jointed by laser in-situ welding method with a Ti foil as intermediate material,the welded joints fracture behavior under different welding conditions was compared in this paper.The results indicated that,the Ti foil intermediate thickness of 0.5 mm was more favorable to form sound bead appearance and interfaces morphology.The tensile strength of joints was up to 50% of the base materials when the fracture occured at the centre of weld,which was quasi-cleavage fracture mode.When the Ti foil intermediate thickness increased up to 0.8 mm,the weld was very susceptible to porosity,lack of fusion defects,and insufficient interfacial reaction,the fracture location always occured at the interface,the tensile strength was lower,which was brittle fracture mode.
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期刊类型引用(8)
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