Age-hardening of high pressure die casting AlMg alloys with Zn and combined Zn and Cu additions

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials & Design Pub Date : 2019-11-05 DOI:10.1016/j.matdes.2019.107927

Lukas Stemper , Bernhard Mitas , Thomas Kremmer , Steffen Otterbach , Peter J. Uggowitzer , Stefan Pogatscher

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引用次数: 39

Abstract

This study investigates the age-hardening of AlMg alloys with Zn and combined Zn and Cu additions. Two AlMg5Mn1 alloys modified with Zn and Cu were processed by high pressure die casting (HPDC) and different heat treatment strategies. Single step artificial aging, artificial aging with pre-aging and the effect of the quenching rate were studied via hardness measurements and transmission electron microscopy (TEM). Single-step artificial aging resulted in an increase in hardness of 58% in peak aged condition for the Zn-only modified alloy and of 56% for the Zn- and Cu-containing alloy. Pre-aging treatments either reduce the necessary aging time or increase the hardness, depending on the parameters used. Microstructural investigations indicate a significant change in the S- or T-phase precursors, and in precipitation density with pre-aging. The alloys have high potential for use as complex structural HPDC components in lightweight transport applications, but are also of general interest for components which require high strength and formability.

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添加Zn及Zn和Cu复合的高压压铸AlMg合金的时效硬化

研究了添加Zn和Zn、Cu复合后AlMg合金的时效硬化。采用高压压铸和不同热处理工艺对两种AlMg5Mn1合金进行了Zn和Cu改性。通过硬度测定和透射电子显微镜(TEM)研究了单步人工时效、预时效人工时效以及淬火速率的影响。单步人工时效使纯Zn改性合金的峰值时效硬度提高58%，含Zn和cu合金的峰值时效硬度提高56%。预时效处理或减少必要的时效时间或增加硬度，这取决于所使用的参数。显微组织研究表明，随着预时效，S-或t相前体和析出密度发生了显著变化。该合金在轻型运输应用中作为复杂结构的HPDC组件具有很高的潜力，但对于需要高强度和可成形性的组件也具有普遍的兴趣。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.