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arXiv 1508.04058cond-mat.mtrl-sci
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二元合金中偏析引起的晶界结合力和脆化的变化

Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys

Michael A. Gibson, Christopher A. Schuh

摘要:

当溶质在晶界富集并降低其内聚能时,发生晶界脆化。虽然晶界富集通常归因于平衡偏析效应,但大多数脆化模型考虑边界处的脱粘或平衡吸附的能量学,而不是同时考虑两种现象。我们开发了一个模型,在断裂前的平衡偏析的条件下引入溶质后,纯金属的晶界的结合能的变化。一个启发式的晶界凝聚力地图描绘是否一个给定的溶质-溶剂对将表现出削弱或加强晶界。分析有助于澄清,晶界脆化需要一种溶质,既降低了边界的内聚能,并在第一位偏析。该图合理地捕获了已知的金属-金属脆化对。

英文摘要:

Grain boundary embrittlement occurs when a solute enriches at a grain boundary and lowers its cohesive energy. While grain boundary enrichment is often attributed to equilibrium segregation effects, most models of embrittlement consider either the energetics of decohesion or the equilibrium adsorption at the boundary, but not both phenomena together. We develop a model for the change in cohesive energy of a grain boundary of a pure metal upon introduction of solute under conditions of equilibrium segregation prior to fracture. A heuristic grain boundary cohesion map is presented to delineate whether a given solute-solvent pair will exhibit weakening or strengthening of grain boundaries. The analysis helps to clarify that grain boundary embrittlement requires a solute that will both lower the cohesive energy of the boundary and segregate to it in the first place. The map reasonably captures known metal-metal embrittling pairs.

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