粗晶lc 4合金在较低温度和较高应变速率条件下，因能产生有效的再结晶细化，而呈现出一定的超塑性。
The coarse crystalline LC4 alloy exhibit some superplasticity under lower temperature and higher strain rate, because it can create effective recrystallization refinement.
提出用低温长时间退火的方法改善其塑性，通过试验确定了退火工艺制度，使产品的变形性能达到了使用要求。
A method of annealing for a long time at low temperature can be used to improve the plasticity and make the products acceptable.
其冲击断口微观形貌由室温时的韧窝断口逐渐变为低温下的塑性沿晶断口。
The fracture appearance is dimple at room temperature, it changes into intercrystalline fracture at low-temperature.
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