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通过Zr55Cu30Al10Ni5非晶合金的差示扫描量热仪(DSC)连续升温和等温退火实验,研究了影响非晶合金超塑性成形工艺时间的三种因素:退火温度,加热速率,退火加工次数.结果表明:退火温度与非晶合金孕育时间存在负指数关系,主要决定了可加工时间的长短,进而影响工艺时间的可选范围;增大加热速率可以一定程度上增大某一退火温度下的孕育时间,延长可加工时间,但是当该退火温度因增大加热速率而超出过冷液相温度区间时,孕育时间达到极大值;多次退火加工会使非晶合金的总体孕育时间出现损失,损失大小与初次退火时间成反比.合理选择退火温度、适度增大加热速率、科学安排加工顺序和过程均有助于在非晶合金超塑性成形加工中延长可加工时间,优化工艺时间,保护材料的非晶特性.
Three factors affecting the time of superplastic forming process of amorphous alloy were investigated by DSC and continuous isothermal annealing experiments of Zr55Cu30Al10Ni5 amorphous alloy: annealing temperature, heating rate and annealing times. : Annealing temperature and amorphous alloy incubation time there is a negative exponential relationship, mainly determines the length of processing time, thereby affecting the process of optional range; increase the heating rate can be increased to some extent, the incubation time of an annealing temperature , To extend the processing time, but when the annealing temperature due to increased heating rate and beyond the supercooled liquidus temperature range, the incubation time reaches a maximum; multiple annealing will make the amorphous alloy total gestation time loss, loss Size and initial annealing time is inversely proportional to the reasonable choice of annealing temperature, a moderate increase in heating rate, the scientific arrangement of the processing sequence and process are conducive to the amorphous alloy superplastic forming process to extend the processing time, optimize the process time and protect the material Amorphous characteristics.