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研究了超声处理对铸态及均匀化处理后7050铝合金显微组织的影响,并采用高温压缩模拟试验对在300～450℃、应变速率为2.77×10~(-4)～2.77×10~(-2) s~(-1)条件下常规与超声铸造7050合金均匀化后的塑性变形行为进行了研究。结果表明:相同条件热变形后,超声铸造铝合金的晶粒比常规铸造的细小;在相同变形条件下,超声铸造合金的流变应力明显要小;超声铸造合金的热变形激活能为136 kJ·mol~(-1),低于常规铸造的155 kJ·mol~(-1),更易热变形。
The effect of ultrasonic treatment on the microstructure of 7050 aluminum alloy after as-cast and homogenized treatment was studied. The effects of ultrasonic treatment on the microstructure of 7050 aluminum alloy after as-cast and homogenized treatment were studied. The effects of ultrasonic treatment at 300-450 ℃, strain rates of 2.77 × 10 -4 ~ 2.77 × 10 ~ (-2) s ~ (-1) under the conditions of conventional and ultrasonic casting of 7050 alloy plastic deformation behavior after homogenization. The results show that after the same conditions of heat deformation, the grain size of ultrasonic casting aluminum alloy is smaller than that of conventional casting. Under the same deformation conditions, the flow stress of ultrasonic casting alloy is obviously smaller. The heat deformation activation energy of ultrasonic casting alloy is 136 kJ · Mol ~ (-1), which is lower than 155 kJ · mol ~ (-1) of conventional casting, which is more easily deformed by heat.