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鋁基復(fù)合材料；真空釬焊；接頭強(qiáng)度；斷裂分析
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TG454

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江蘇省青年科技基金資助(BQ98021)


Fracture Mode and Joint Strength for Brazing of SiCp/LY12 Metal Matrix Composite with Al-Cu-Si-Mg Filler
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    摘要:

    采用Al-28Cu-5Si-2Mg釬料，在真空高頻感應(yīng)條件下對(duì)SiCp/LY12復(fù)合材料進(jìn)行了釬焊連接。試驗(yàn)結(jié)果表明：釬焊溫度、保溫時(shí)間、SiC顆粒的體積分?jǐn)?shù)以及焊后時(shí)效處理均會(huì)影響SiCp/2024Al復(fù)合材料釬焊接頭的連接強(qiáng)度：釬縫中有少量SiC顆粒存在，且分布不均勻。在靠近母材處出現(xiàn)貧化區(qū)，在釬縫中心兩側(cè)有較小的集聚區(qū)。SiCp/LY12復(fù)合材料釬焊接頭的斷裂是由于釬縫金屬中的SiC顆粒成為裂源，裂紋沿釬縫作低能量撕裂所致。

    Abstract:

    The brazing of SiC particulate reinforced LY12 alloy matrix composite has been carried out by using the high-frequency induction vacuum brazing process with Al-28Cu-5Si-2Mg filler.The results showed that brazing temperature, holding time, SiC particle volume percentage and post heat treatment condition combine to influence the joint strength of SiCp/LY12. The SiC particles occur in the brazing seam and the distribution of SiC particles in the joint is not as uniform as that in the composites. Particle-poor zones in the joint exist near the base metal, and particle-rich zones exist in the center of the brazing seam. In addition, the results indicate that the failure of the composite is predominantly initiated by microcracks initiating at the SiC particle in the brazing seam and propagated along it with low energy.

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鄒家生 許如強(qiáng) 趙其章 陳錚.鋁基復(fù)合材料；真空釬焊；接頭強(qiáng)度；斷裂分析[J].稀有金屬材料與工程,2004,33(9):972~975.[Zou Jiasheng, Xu Ruqiang, Zhao Qizhang, Chen Zheng. Fracture Mode and Joint Strength for Brazing of SiCp/LY12 Metal Matrix Composite with Al-Cu-Si-Mg Filler[J]. Rare Metal Materials and Engineering,2004,33(9):972~975.]
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  • 最后修改日期:2003-04-09
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