Effects of Load on Dry Sliding Wear Behavior of Mg–Gd–Zn–Zr Alloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第7期
论文作者：Jie Zhang Xiaobo Zhang Qinghua Liu Shujie Yang Zhangzhong Wang
文章页码：645 - 651
摘 要：Dry sliding wear tests on as-cast and T6-treated Mg–3Gd–1Zn–0.4Zr（wt%, GZ31K） and Mg–6Gd–1Zn–0.4Zr（wt%, GZ61K） alloys were performed using a ball-on-disk configuration at room temperature. Friction coefficient and wear rate of the alloys were measured under three different applied loads（50 N, 100 N, and 200 N, respectively）. Worn surface morphologies were analyzed using a scanning electron microscope（SEM） coupled with an energy dispersive spectrometer（EDS）. It is found that the friction coefficient of the alloys decreases with increasing load, except the as-cast GZ61 K. The wear rates of the as-cast Mg–Gd–Zn–Zr alloys increase with the increase of the load. However, the wear rates of the T6-treated Mg–Gd–Zn–Zr alloys first increase because of the participation of a large amount of needle-like precipitates, but then decline due to obvious work hardening. The wear mechanisms of abrasion, plastic deformation, oxidation, adhesion and delamination are detected. Abrasion dominates the wear mechanism under the low load; whereas, adhesion is the main wear mechanism under intermediate load, and plastic deformation has great effect on the wear rate under high applied load.
Jie Zhang1，Xiaobo Zhang1,2，Qinghua Liu1，Shujie Yang1，Zhangzhong Wang1,2
1. School of Materials Science and Engineering, Nanjing Institute of Technology2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
摘 要：Dry sliding wear tests on as-cast and T6-treated Mg–3Gd–1Zn–0.4Zr（wt%, GZ31K） and Mg–6Gd–1Zn–0.4Zr（wt%, GZ61K） alloys were performed using a ball-on-disk configuration at room temperature. Friction coefficient and wear rate of the alloys were measured under three different applied loads（50 N, 100 N, and 200 N, respectively）. Worn surface morphologies were analyzed using a scanning electron microscope（SEM） coupled with an energy dispersive spectrometer（EDS）. It is found that the friction coefficient of the alloys decreases with increasing load, except the as-cast GZ61 K. The wear rates of the as-cast Mg–Gd–Zn–Zr alloys increase with the increase of the load. However, the wear rates of the T6-treated Mg–Gd–Zn–Zr alloys first increase because of the participation of a large amount of needle-like precipitates, but then decline due to obvious work hardening. The wear mechanisms of abrasion, plastic deformation, oxidation, adhesion and delamination are detected. Abrasion dominates the wear mechanism under the low load; whereas, adhesion is the main wear mechanism under intermediate load, and plastic deformation has great effect on the wear rate under high applied load.
关键词：
