论文标题
富含Cu的纳米晶合金中无定量到订购的肤色过渡的关键冷却速率
Critical cooling rates for amorphous-to-ordered complexion transitions in Cu-rich nanocrystalline alloys
论文作者
论文摘要
纳米晶金属中的无定形肤色具有提高机械性能和辐射耐受性以及对晶粒生长的耐药性的潜力。在这项研究中，通过观察高温从高温发生对无定形到订购的肤色跃迁发生的冷却速率的影响来研究二元和三元铜合金中无定形肤色的稳定性。批量Cu-ZR和Cu-Zr-HF合金样品被退火以诱导边界预言，然后通过一项通过样品高度诱导局部冷却速率梯度梯度的程序淬灭。发现与Cu-ZR合金相比，在Cu-ZR-HF合金中，发现无定形的肤色厚度分布与Cu-ZR-HF合金中的局部冷却速率是不变的，这表明无定形肤色结构的稳定性增强了，该合金在缓慢冷却的区域中具有较薄的无定形肤色。实验结果用于构建二元和三元合金的无定形肤色转变的时间温度转换图，从而更深入地了解冷却速率和晶粒边界化学对肤色过渡的影响。发现避免三元合金中肤色过渡所需的临界冷却速率至少要比二元合金慢三个数量级。
Amorphous complexions in nanocrystalline metals have the potential to improve mechanical properties and radiation tolerance, as well as resistance to grain growth. In this study, the stability of amorphous complexions in binary and ternary Cu-based alloys is investigated by observing the effect of cooling rate from high temperature on the occurrence of amorphous-to-ordered complexion transitions. Bulk Cu-Zr and Cu-Zr-Hf alloy samples were annealed to induce boundary premelting and then quenched through a procedure that induces a gradient of local cooling rate through the sample height. Amorphous complexion thickness distributions were found to be invariant to local cooling rate in the Cu-Zr-Hf alloy, demonstrating enhanced stability of the amorphous complexion structure compared to the Cu-Zr alloy, which had thinner amorphous complexions in the regions that were slowly cooled. The experimental results are used to construct time-temperature-transformation diagrams of the amorphous-to-ordered complexion transition for both the binary and ternary alloys, enabling a deeper understanding of the influence of cooling rate and grain boundary chemistry on complexion transitions. The critical cooling rate necessary to avoid complexion transitions in the ternary alloy is found to be at least three orders of magnitude slower than that for the binary alloy.
