摘要
在工业化生产条件下,采用半连续铸造、自由锻造、固溶和时效处理技术制备Al-4.6Zn-2.58Mg合金锻件。采用热加工模拟方法优化该合金的热加工工艺。试验结果表明：该合金高温压缩变形时的流变应力随变形温度的升高而减小,随变形速率的提高而增大。合金在420℃以下热变形,热变形组织主要为动态回复组织;在420℃以上热变形,热变形组织有动态再结晶发生。在400℃-420℃之间热压缩变形,变形抗力比较小;380℃-420℃时铸态塑性最好。该合金较适宜的热加工温度范围为400℃-420℃。
The Al-4.6Zn-2.58Mg alloy forgings have been prepared by processes of semi-continuous casting,free forging,solid solution and aging heat treatment at industry production condition.Thermal processing technology has been optimized by using of thermal processing simulation method.The results show that,at high temperature compressing deformation condition,the deformation flow stress of Al-4.6Zn-2.58Mg aluminum alloy decreases with deformation temperature increasing,and the stress increases with strain rate increasing.When thermal deformation temperature is under 420℃,the thermal deformation structure will be dynamic recovery structure mainly,and re-crystallization appears in the thermal deformation structure while the deformation temperature higher than 420℃.During 400℃-420℃,the thermal deformation resistance is smaller.The best plastic property of the cast ingot appears at 380℃-420℃.The suitable hot deformation temperature of the alloy is at 400℃-420℃.
出处
《轻合金加工技术》
CAS
北大核心
2011年第9期59-64,共6页
Light Alloy Fabrication Technology
