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OALib Journal期刊
ISSN: 2333-9721
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用强冷摩擦搅拌工艺制备超细晶紫铜板材
Abstract:
？提出了一种制备整块、全板厚超细晶板材的强冷摩擦搅拌工艺,利用搅拌头与基材之间摩擦搅拌过程的剧烈塑性变形条件细化金属晶粒,通过搅拌位置的机械移动制备整块的超细晶板材.同时,采用强制冷却方式抑制动态回复和再结晶晶粒的长大,提高晶粒细化效果.建立了该工艺过程中应变速率、应变量及加热功率的数学模型,优化了紫铜板材细晶制备工艺参数,对所制得的细晶材料进行了硬度试验和显微组织分析.结果表明,增强冷却能减小晶粒尺寸和提高细晶材料的硬度.制备出的超细晶紫铜板材布氏硬度可达hbs100,比退火紫铜的硬度约高一倍.
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