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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >Grain boundary versus transgranular ductile failure
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Grain boundary versus transgranular ductile failure

机译：晶界与经晶延性破坏

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摘要

The competition between intergranular and intragranular fracture is investigated using a bilayer damage model, which incorporates the relevant microstructural features of aluminium alloys with precipitate free zones (PFZ) nearby the grain boundary. One layer represents the grain behaviour: due to precipitation, it presents a high yield stress and low hardening exponent. The other layer represents the PFZ which has the behaviour of a solid solution: it is much softer but with a much higher strain hardening capacity. In both layers, void growth and coalescence is modelled using an enhanced Gurson-type model incorporating the effects of the void aspect ratio and of the relative void spacing. The effects on the ductility (ⅰ) of the flow properties of each zone, (ⅱ) of the relative thickness of the PFZ, and (ⅲ) of the particles spacing and volume fraction in the PFZ are elucidated. Comparisons are made with experimental data. Based on the previous analysis, qualitative understanding of trends in the fracture toughness of aluminium alloys can be gained in order to provide a link with the thermal treatment process.
机译：使用双层损伤模型研究了晶间断裂与晶内断裂之间的竞争，该模型结合了在晶界附近具有无沉淀区（PFZ）的铝合金的相关微结构特征。一层代表谷物的行为：由于沉淀，它表现出高屈服应力和低硬化指数。另一层代表具有固溶特性的PFZ：它柔软得多，但应变硬化能力高得多。在这两层中，使用增强的Gurson型模型对空隙的生长和合并进行建模，该模型结合了空隙长宽比和相对空隙间距的影响。阐明了对每个区域的流动性的延展性（ⅰ），PFZ的相对厚度的（ⅱ）和PFZ中颗粒间距和体积分数的（ⅲ）的影响。与实验数据进行比较。根据先前的分析，可以定性地了解铝合金的断裂韧性趋势，以便与热处理过程建立联系。

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