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不同热处理对Al-7.95Zn-1.84Mg-0.65Cu合金力学性能和耐腐蚀性能的影响
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不同热处理对Al-7.95Zn-1.84Mg-0.65Cu合金力学性能和耐腐蚀性能的影响
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Journal Article
不同热处理对Al-7.95Zn-1.84Mg-0.65Cu合金力学性能和耐腐蚀性能的影响
2020
Overview
TG166.3; 通过硬度和拉伸实验以及晶间腐蚀和透射电镜(TEM)重点研究了回归再时效(RRA)热处理对Al-7.95Zn-1.84Mg-0.65Cu铝合金力学性能和耐蚀性的影响.研究结果表明,相比于单级峰值时效(T6)工艺,经RRA工艺(120℃/24 h+200℃/10 min+120℃/24 h)处理后,Al-7.95Zn-1.84Mg-0.65Cu合金能够获得较高的硬度,同时抗拉强度达到528.37 MPa,伸长率为13.73％,强塑积提高了29.4％;电导率为40.47％IACS,晶间腐蚀深度仅为59.43μm,剥落腐蚀等级为EA级.透射电镜结果表明,RRA处理后合金晶内析出尺寸较大、衬度更加明显、强化效应大的η′相,晶界析出相呈现不连续分布,晶界析出相更加粗大,并形成了更宽的无沉淀析出带.
Publisher
上海大学 材料科学与工程学院,上海,200072
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