Effect of heat treatment on wear properties of extruded AZ91 alloy treated with yttrium

The influence of heat treatment（T6） on the ambient temperature dry sliding wear behavior of the extruded AZ91 alloy treated with Y using a pin-on-disc apparatus was investigated. Wear rates and friction coefficients were measured within a load range of 5-70 N at a sliding speed of 0.188 m/s over a c...

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Bibliographic Details
Published inJournal of rare earths Vol. 34; no. 3; pp. 308 - 314
Main Author 闫洪 王志伟
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2016
Subjects
AZ91 alloy
AZ91合金
AZ91镁合金
heat treatment
hot extrusion
rare earths
wear resistance
光盘装置
干滑动摩擦磨损性能
扫描电子显微镜
挤压变形
摩擦系数
热处理
AZ91 alloy
hot extrusion
heat treatment
wear resistance
rare earths
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Summary:The influence of heat treatment（T6） on the ambient temperature dry sliding wear behavior of the extruded AZ91 alloy treated with Y using a pin-on-disc apparatus was investigated. Wear rates and friction coefficients were measured within a load range of 5-70 N at a sliding speed of 0.188 m/s over a constant sliding distance of 226.195 m. Worn surfaces and debris were examined using a scanning electron microscope equipped with an energy dispersive spectrometer. The experimental results revealed that, as applied load was increased, the alloy wear rates increased, but the friction coefficients decreased. Four chief operating wear mechanisms were observed, i.e., abrasion, oxidation, delamination and plastic deformation. The extruded AZ91 alloy treated with Y exhibited better wear resistance by adopting T6, which was mainly due to large amounts of fine Mg_（17）Al_（12） distributed in the grains and the resulting modified strength and micro-hardness.
Bibliography:AZ91 alloy; wear resistance; hot extrusion; heat treatment; rare earths
11-2788/TF
The influence of heat treatment（T6） on the ambient temperature dry sliding wear behavior of the extruded AZ91 alloy treated with Y using a pin-on-disc apparatus was investigated. Wear rates and friction coefficients were measured within a load range of 5-70 N at a sliding speed of 0.188 m/s over a constant sliding distance of 226.195 m. Worn surfaces and debris were examined using a scanning electron microscope equipped with an energy dispersive spectrometer. The experimental results revealed that, as applied load was increased, the alloy wear rates increased, but the friction coefficients decreased. Four chief operating wear mechanisms were observed, i.e., abrasion, oxidation, delamination and plastic deformation. The extruded AZ91 alloy treated with Y exhibited better wear resistance by adopting T6, which was mainly due to large amounts of fine Mg_（17）Al_（12） distributed in the grains and the resulting modified strength and micro-hardness.
YAN Hong , WANG Zhiwei （1. Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China, 2. Key Laboratory of Light Alloy Preparation ＆ Processing in Nanchang City, Nanchang 330031, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(16)60030-3