Mechanical Properties of Thixoforged In Situ Mg2Sip/AM60B Composite at Elevated Temperatures
Suqing Zhang,
Tijun Chen,
Jixue Zhou,
Dapeng Xiu,
Tao Li,
Kaiming Cheng
Affiliations
Suqing Zhang
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Tijun Chen
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Jixue Zhou
Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Qilu University of Technology (Shandong Academy of Science), Jinan 250014, China
Dapeng Xiu
Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Qilu University of Technology (Shandong Academy of Science), Jinan 250014, China
Tao Li
Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Qilu University of Technology (Shandong Academy of Science), Jinan 250014, China
Kaiming Cheng
Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Qilu University of Technology (Shandong Academy of Science), Jinan 250014, China
The mechanical behaviors of the thixoforged in situ Mg2Sip/AM60B composite at elevated temperatures were evaluated. The results indicated that the thixoforged composite exhibits higher UTS (ultimate tensile strength) than that of the thixoforged AM60B at the cost of elongation. As the testing temperature rises from 25 to 300 °C, the UTS of both these two materials decreases while their elongations increases. The enhanced dislocation motion ability, the softened eutectic β phase at 120 °C, the activated non-basal slipping and the dynamic recovery and recrystallization mechanisms at 150 °C are responsible for the change in tensile properties with testing temperatures. The fracture mode transforms from the ductile into the brittle as the initial strain rate increases from 0.01 to 0.2 s−1 at 200 °C.
