مقالههای M.M. Mahdavian
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
۱Formation of a solid solution through accumulative roll bonding (ARB) and post–heat treatment of multilayered Cu\Zn\Al
اطلاعات انتشار: Iranian Journal of Materials Forming، اول،شماره۱، Spring and Summer ۲۰۱۴، سال ۰
تعداد صفحات: ۸
In the present study, the capability of accumulative roll bonding (ARB) and subsequent heat–treatment to fabricate solid solution from a multilayered Cu\Zn\Al was investigated. Two post–heat treatment (one–step and two–step) routes were proposed. In the first, the ARB processed material was heated to 800 C for 5:30 hours and allowed to cool slowly in a furnace (one–step route). In the second (two–step route), the composite was heated to 800 C for 3 hours and quenched in the cold water (0 ºC). The microstructures were characterized using a field emission scanning electron microscope (SEM) equipped with energy dispersive x–ray detector (EDX). The x–ray diffraction (XRD) pattern was used to identify the phases. Results showed that even after imposing high ARB cycles (up to 14 cycles), the solid solution could not be formed so far. However, after the subsequent heat–treatment, Cu, Zn and Al distributed uniformly in the microstructure and a copper–based solid solution was formed.
۲Fabrication of the Cu–Zn multilayer and Cu–Zn alloy by accumulative roll bonding (ARB) with an emphasis on the wear behavior
اطلاعات انتشار: Iranian Journal of Materials Forming، اول،شماره۲، Autumn ۲۰۱۴، سال ۰
تعداد صفحات: ۲۰
Accumulative roll bonding (ARB) was used to fabricate the Cu–Zn multilayer and Cu–Zn solid solution. A lamellar structure with the hardness of about 130 VHN was formed after eight ARB cycles. Following to the suitable heat treatment, a solid solution with a uniform microstructure and hardness of about 57 VHN was produced. The dominant wear mechanism in the ARB processed multilayer was found to be delamination and spalling while in the heat–treated sample was adhesion. The weight loss of the ARBed multilayer was higher due to the occurrence of spalling and formation of the cracks and cavities during the ARB. On the other hand, the friction coefficient and its undulation were lower, which was contributed to the lubricating effect of Zn and the higher hardness of the ARB processed multilayer. In the heat–treated sample, the ability to plastic deformation and the adhesion between the contact surfaces causes the increase in the friction coefficient and its variation.
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