Abstract：Laser was used as heating source and laser brazing assisted with ultrasound was performed,aiming to wet Al-based brazing filler metal with low melting points on TiNi SMA substrates. The result shows that with the increase of ultrasonic time,the spreading areas increase firstly and then decrease. Black Al2Si,Al3Si,AlSi phases are observed at wetting frontier. The grain size of AlSi and AlSiTi phases in the center of the droplet near interfacial region, as well as the Si content contain in these grains increases with ultrasonic time. In addition,with the decrease of laser heating power,the spreading areas also decrease,whereas the wetting angle increases. Intermetallic compound AlSi(Ti,Ni) with a width less than 10μm grows in the center of the droplet near interfacial region. Under the following optimal processing parameters,ultrasonic vibration time 1.0s,laser heating power 470W and the substrate surface roughness 0.03μm,the maximum spreading areas obtained is 106.45mm2 and the optimum wetting angle is 16°.
李红, 陶博浩, 栗卓新, 郭福. 超声振动与激光加热耦合条件下Al基钎料在TiNi形状记忆合金表面润湿铺展行为[J]. 材料工程, 2016, 44(3): 66-71.
LI Hong, TAO Bo-hao, LI Zhuo-xin, GUO Fu. Spreading and Wetting Behavior of Al-based Brazing Filler Metal on TiNi Shape Memory Alloy Substrate by Coupled Effect of Ultrasonic Vibration and Laser Heating. Journal of Materials Engineering, 2016, 44(3): 66-71.
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