High cycle fatigue improvement by heat-treatment for semi-continuous casting Mg96.34Gd2.5Zn1Zr0.16 alloy

作者：He, Zongling; Peng, Liming; Pe, Penghuai^*; Wang, Yingxin; Hu, Xiaoyu; Ding, Wenjiang

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014, 604: 78-85.

DOI：10.1016/j.msea.2014.03.017

• Semi-continuous casting
• Mg-Gd-Zn alloy
• Heat-treatment
• Fatigue properties

High cycle fatigue behavior of casting Mg96.34Gd2.5Zn1Zr0.16 alloy was investigated for its improvement by heat-treatment. After solution treatment (T4, 10 h@773 K) or solution treatment plus artificial aging (T6, 10 h@773 K + 128 h@473 K), fatigue strength of this alloy was found to be enhanced. The T6-treated alloy achieved the highest fatigue strength, 130 MPa, being 25 MPa and 18 MPa greater than those of the as-cast and T4-treated alloy, respectively. The average fatigue life of the heat-treated alloys is longer than that of the as-cast alloy a given stress amplitude. For the distribution of fatigue life, a fatigue life gap spanned from 105 to 107 can be observed in the as-cast and T4-treated alloy. Such a gap is absent after the alloy received artificial aging. The mechanism for the high cycle fatigue behavior of the casting alloy after heat-treatment was also discussed.

• 出版日期2014-5-16
• 单位上海交通大学