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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Al--5.2Cu--0.4Mg--1.02Ag合金的时效析出行为研究
, PP. 579-584
Keywords: Al--5.2Cu--0.4Mg--1.02Ag合金,力学性能,析出,Ω相,粗化
Abstract:
研究了Al--5.2Cu--0.4Mg--1.02Ag合金在不同时效制度下的力学性能和显微组织,并详细分析了合金的主要析出相Ω的形核与粗化,同时提出了浓度台阶粗化机制.结果表明合金的主要强化相是Ω相和θ'相.欠时效时出现了大量细小的Ω相和少量的θ'相;峰时效时Ω相和θ'相的体积分数大大增加,且Ω相与基体呈半共格关系;过时效时出现了球状的平衡θ'相,Ω相略为长大,而θ'相的长度和厚度明显增大.Mg/Ag原子簇是时效初期Ω相的形核核心;Mg,Ag和Cu的浓度差异引起的台阶迁移是Ω相粗化的驱动力.由于Mg和Ag原子在Ω相与基体界面存在时降低了晶格的畸变能,使得Cu原子向Ω相迁移的速率受到限制,因此Ω相能够在长时间下保持片状而不发生共格失稳.
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