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采用热分析方法,研究了挤压变形ZA16合金不同加工状态下共析转变的表观激活能。结合热处理技术,研究了变形ZA16合金的热稳定性与组织演化的关系。随加工量的增加,材料的激活能降低,热稳定性变弱。铸态合金退火后的硬度降低,而变形合金退火后的硬度明显升高。合金变形过程中呈现的加工软化、退火硬化的现象,是由于加工过程导致了粗晶的碎化,使得材料能够容许更大的变形量。退火后沿加工方向的析出组织,破坏了发生协调变形所需的球化组织在受力过程中的晶粒转动,导致退火硬化现象的发生。
Thermal analysis method was used to study the apparent activation energy of eutectoid transformation of ZA16 alloy under different working conditions. Combined with heat treatment technology, the relationship between thermal stability and microstructure evolution of deformed ZA16 alloy was studied. As the amount of processing increases, the activation energy of the material decreases and the thermal stability becomes weaker. After as-cast alloy annealing hardness decreased, while the deformation of the alloy after annealing the hardness was significantly increased. The phenomenon of processing softening and annealing during the deformation of the alloy is due to the fact that the processing causes the reduction of the coarse grains so that the material can tolerate a greater amount of deformation. Annealed after processing along the direction of the organization, undermining the coordination of deformation required for the spherical structure of the ball in the process of rotation, resulting in the occurrence of annealing hardening phenomenon.