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对AZ31镁合金进行了恒温超塑性压缩和恒温超塑性固态焊接试验,研究了AZ31镁合金在大气环境下恒温超塑性固态焊接可行的工艺参数。结果表明:温度对恒温超塑性固态焊接接头强度影响较大,时间的影响其次,应变速率的影响相对较小。恒温超塑性固态焊接过程中组织发生了动态再结晶,并能在更省能源、省时间的条件下,达到与扩散焊相当的接头剪切强度。在预压应力30 MPa、焊接温度450℃、应变速率为1×10~(-4)s~(-1)的条件下,经13 min压接,可实现AZ31镁合金的超塑性连接,剪切强度达到42.08 MPa。
The experiment of constant temperature superplastic solid state compression test and thermostat superplastic solid state test of AZ31 magnesium alloy were carried out. The feasible process parameters of AZ31 magnesium alloy in constant temperature superplastic solid state welding under atmospheric environment were studied. The results show that the influence of temperature on the strength of the thermostatic superplastic solid welding joint is greater, the influence of time is secondly, and the influence of strain rate is relatively small. In the process of constant temperature superplastic solid state welding, dynamic recrystallization occurs in the microstructure, and under the condition of more energy saving and saving time, the shear strength of the joint corresponding to diffusion welding is reached. Under the conditions of pre-stress 30 MPa, welding temperature 450 ℃ and strain rate 1 × 10 ~ (-4) s ~ (-1), the superplasticity of AZ31 magnesium alloy can be achieved by crimping for 13 min. Cutting strength of 42.08 MPa.