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Vacancies and the Tin-Assisted Nucleation of θ' in Al-Cu-Sn

机译:Al-Cu-Sn中的空位和锡辅助成核

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The role of quenched-in vacancies on the tin-assisted nucleation of the θ' phase in the Al-rn1.7at.%Cu-0.01at.%Sn alloy was investigated by naturally ageing the alloy for differentrntimes before artificial ageing at 200℃. The introduction of the natural ageing stage wasrnfound to cause a small negative effect on the magnitude of the peak hardness for 200℃rnartificial ageing. The presence of a narrow (60-100 nm) precipitate-free zone (PFZ) aroundrngrain boundaries, compared with the large (>800 nm) PFZ typical of the binary Al-rn1.7at.%Cu alloy, confirms the long-held belief that tin atoms trap quenched-in vacancies. Arnsimilarly narrow, but slightly smaller PFZ (40-80 nm) is characteristic of the binary Al-rn0.01at.%Sn alloy. It is suggested that Sn controls the diffusion of Cu atoms through arnrelatively strong interaction between solute atoms of Sn and Cu.
机译:在200℃进行人工时效之前,通过自然时效处理不同时间,研究了淬火空位对Al-rn1.7at。%Cu-0.01at。%Sn合金中θ'相锡辅助成核的作用。 。发现自然时效阶段的引入对200℃人工时效的峰值硬度的大小产生了较小的负面影响。与二元Al-rn1.7at。%Cu合金典型的大(> 800 nm)PFZ相比,在晶界周围存在狭窄(60-100 nm)的无沉淀区(PFZ),证实了长期存在认为锡原子会捕获淬火空位。二元Al-rn0.01at。%Sn合金的特征是同样窄,但略小的PFZ(40-80 nm)。提示Sn通过Sn和Cu的溶质原子之间较强的相互作用来控制Cu原子的扩散。

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