借助于光学显微镜、扫描电镜和EBSD等手段,研究了芯材再结晶组织对复合钎焊铝箔抗下垂性能的影响。结果表明,在钎焊过程中皮材发生熔化,低熔点Al-Si共晶相从皮材向芯材渗入,降低了扩散层的熔点,使得在高温中支撑材料强度的芯材厚度降低,不利于抗下垂性能。而存在较小析出相的试样由于析出相钉扎亚晶界和位错运动,阻碍再结晶,最终形成沿轧向分布的长条状再结晶组织,Al-Si相渗入深度较小,材料的抗下垂性较好,且钎焊后的强度和伸长率并未有明显的降低。
Effect of recrystallized microstructure on sagging resistance of a three-layer aluminum brazed sheet was investigated by means of optical microscope,SEM and EBSD.The results indicate that the inleakage of low-melting-point Al-Si eutectic phase into the core alloy decreases the effective thickness of the core alloy during brazing so as to lower sagging resistance of the sheet.It is found that the sheet with coarse strip-like microstructure exhibits better sagging resistance and proper mechanical performance.
参考文献
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