Abnormal grain growth (AGG) took place during solution treatment of extruded ZK60 Mg alloy. The driving force of AGG was stored energy gradient, and the {0001} <11-20> grains acted as candidates. The grain size and topology advantages contributed to the propagation of AGG, while lots of stored energy was consumed by static recrystallization and grain growth, resulting in the ending of AGG. The extruded alloy had the worst corrosion resistance with a corrosion rate of 6.3 mm/y, and the welding zone was preferentially corroded. The corrosion rate dropped to 3.7 mm/y after solution due to the formation of abnormal grains.

中文翻译：

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固溶处理的ZK60 Mg合金的异常粗大晶粒的形成及其对腐蚀行为的影响

ZK60 Mg挤压合金固溶处理过程中发生了异常晶粒生长（AGG）。AGG的驱动力是存储的能量梯度，并且{0001} <11-20>晶粒充当候选。晶粒尺寸和拓扑结构的优势促进了AGG的传播，而静态再结晶和晶粒的生长消耗了大量的存储能量，从而导致AGG的终止。挤出的合金具有最差的耐腐蚀性，腐蚀速率为6.3mm / y，并且焊接区被优先腐蚀。固溶后，由于形成异常晶粒，腐蚀速率降至3.7 mm / y。