Effects of Copper Content and Mold Temperature on the Hot Tearing Susceptibility of Mg-7Zn- x Cu-0.6Zr Alloys
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MAGNESIUM (Mg) alloys are widely used in aerospace, automobile, and electronic industries due to their low density, high specific stiffness, and corrosion resistance.[1–3] Mg alloys have a wide range of solidification temperature and significant hot tearing tendency, which is a severe and irreversible defect, and occurs easily during castings process.[4,5] Understanding the hot tearing susceptibility (HTS) of Mg alloys is necessary for its industrial and commercial utilization.[6–8] Till date, extensive research efforts have been devoted to the investigation of the hot tearing phenomenon during solidification by using both the theoretical and experimental methods.[9–12] Magnesium-zinc (Mg-Zn)-based alloys exhibit promising potential application as high-temperature structural components in automobile industry due to their preferable hyperthermia stability. However, higher HTSs of Mg-Zn binary alloys have limited their practical applications. Zhou et al.[13] and Yang et al.[14] reported that the HTS of Mg-Zn binary alloy followed the so-called ‘‘lambda’’ shape curve. The curve presented that the HTS of Mg-Zn binary alloy increased with increasing Zn content and then decreased with YE ZHOU, PINGLI MAO, ZHI WANG, YIZHOU LI, ZHENG LIU, and FENG WANG are with the School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P.R. China. Contact e-mail: [email protected] Manuscript submitted May 22, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS B
further addition of Zn. In previous studies, the effects of addition of yttrium (Y), calcium (Ca), and aluminum (Al) alloy elements on the HTS of Mg-Zn alloys were investigated. Liu et al.[15] investigated the effect of Y on HTS of Mg-Zn-Zr alloys. The results showed that HTS of Mg-Zn-Y-Zr alloys first increased with Y addition, and then decreased with further increase in Y content. Effect of Ca content on the HTS of Mg-Zn-Ca ternary alloys was also studied.[16–18] The results indicated that the Ca element played a significant role in the HTS behavior of Mg-Zn-Ca ternary alloys, and higher Ca content reduced the extent of HTS. Zhou et al.[13] found that HTS of Mg-Zn alloys decreased with the addition of Al element. Huang et al.[19] investigated the effect of pouring and mold temperatures on HTS of commercial AZ91D and newly developed Mg alloys, and showed that the high mold temperature resulted in low HTS, which was contrary to that of pouring temperature. Mg-Zn-Cu ternary alloys have attracted extensive attention in recent years due to their better performance at high temperature. However, most of the previous studies mainly focused on the investigation of their microstructure and mechanical properties, and only a limited research has been done on the hot tearing behavior of these alloys. In order to investigate the HTS of Mg-Zn-Cu alloys, the effects of Cu content (0, 1, and 2 wt pct) and the mold temperature (200 and 250 °C) on the hot tearing behavior of Mg-7Zn-xCu-0.6Zr alloys were systematically investigated in this study. Furthermore, the c
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