On the work-hardening behaviour of the additively manufactured Al-Si-Mg alloys: Composite-like versus networked microstructure

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Emanuela Cerri, Emanuele Ghio
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引用次数: 0

Abstract

Al-Si-Mg alloys are widely used for manufacturing components via laser powder bed fusion in various industrial applications where ductility and the capacity to accommodate the strain hardening are key criteria. The ductility of the laser powder bed-fused Al alloys has become a crucial property due to their fine cellular microstructure. Post-processing heat treatments improve ductility, but resultant microstructural changes affect the work-hardening behaviour, deformability, and uniform elongation values. This study aims to investigate the work-hardening capability, uniform elongation and deformability of AlSi7Mg and AlSi10Mg samples after different post-processing heat treatments by using tensile tests, optical and scanning electron microscopies. At aging temperatures below 200 °C, the fully cellular structure of eutectic Si governs both the work-hardening behaviour and the strengthening mechanisms, despite the precipitation phenomenon. When direct-aging temperatures exceed 200 °C, the coarsening of the Si-eutectic network modifies work-hardening behavior (Stages 1–3), accentuating the effects induced by the precipitates. Artificial aging highlights the role of precipitates in controlling both work-hardening properties and deformability.

Abstract Image

关于添加制造的铝硅镁合金的加工硬化行为:复合微结构与网络微结构
铝-硅-镁合金在各种工业应用中被广泛用于通过激光粉末床熔融技术制造部件,其中延展性和适应应变硬化的能力是关键标准。激光粉末床熔融铝合金的延展性因其细小的蜂窝状微结构而成为一项关键性能。后加工热处理可提高延展性,但由此产生的微观结构变化会影响加工硬化行为、变形能力和均匀伸长值。本研究旨在通过拉伸试验、光学显微镜和扫描电子显微镜,研究经过不同后处理热处理的 AlSi7Mg 和 AlSi10Mg 样品的加工硬化能力、均匀伸长率和变形能力。在低于 200 °C 的老化温度下,尽管存在析出现象,但共晶硅的全蜂窝结构对加工硬化行为和强化机制都有影响。当直接老化温度超过 200 °C时,硅共晶网络的粗化改变了加工硬化行为(阶段 1-3),加剧了析出物的影响。人工老化突出了析出物在控制加工硬化特性和变形性方面的作用。
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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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