Dry sliding wear behavior of AA7075 alloy produced by thixocasting

IF 2.4 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Testing Pub Date : 2023-11-28 DOI:10.1515/mt-2023-0338

Hudaverdi Bilgen, Omer Sahin, N. Akar, V. Kilicli

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Abstract

Abstract In this study, the wear behavior of AA7075 alloy produced by thixocasting was investigated. The wear behavior of the AA7075 alloy is examined for three cases: extruded with T6 heat treatment, as-thixocast, and thixocast with T6 conditions. The dry sliding wear test was conducted with a tribometer according to ASTM G-99 standard. The microstructures were characterized by optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX). The tensile and hardness tests were performed to evaluate the mechanical properties. The AA7075 alloy was successfully shaped by thixocasting. The as-thixocast sample exhibited typical globular structures with multinary eutectic structures along the grain boundaries. The globular grains transform into a polygonal structure, and the grain size increases from 50 μm to 60 μm in the thixocast + T6 sample. This microstructure exhibited excellent wear resistance under dry sliding conditions in the thixocast + T6 sample. The aging treatment with prolonged solution process improved the mechanical properties two times and the wear rate three times for the thixocast AA7075 alloy. Furthermore, the thixocast + T6 sample exhibited a significant decrease in the coefficient of friction with the lowest wear rate compared to the as-thixocast sample. The dominant wear mechanisms are microdelamination, adhesion, and oxidation in all samples.

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触变铸造法生产的 AA7075 合金的干滑动磨损行为

摘要本研究调查了通过触变铸造生产的 AA7075 合金的磨损行为。研究了 AA7075 合金在三种情况下的磨损行为：经 T6 热处理的挤压、原硫代铸造和在 T6 条件下的硫代铸造。根据 ASTM G-99 标准，使用摩擦磨损测试仪进行了干滑动磨损测试。用光学显微镜、扫描电子显微镜（SEM）和能量色散 X 射线分析（EDX）对微观结构进行了表征。此外，还进行了拉伸和硬度测试，以评估其机械性能。AA7075 合金成功地通过触变铸造成型。混铸后的样品呈现出典型的球状结构，沿晶界具有二元共晶结构。球状晶粒转变为多边形结构，晶粒大小从 50 μm 增大到触变铸造 + T6 样品中的 60 μm。在干滑动条件下，这种微观结构在触模铸造 + T6 样品中表现出优异的耐磨性。通过延长固溶过程的时效处理，触铸 AA7075 合金的机械性能提高了两倍，磨损率提高了三倍。此外，与混铸样品相比，混铸 + T6 样品的摩擦系数显著降低，磨损率最低。所有样品的主要磨损机制都是微层压、粘附和氧化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Testing 工程技术-材料科学：表征与测试

CiteScore

4.20

自引率

36.00%

发文量

165

审稿时长

4-8 weeks

期刊介绍： Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.