Effect of Heat Treatment on Microstructure and Mechanical Properties of Alloy Mg – 10% Gd – 3% Y – 0.6% Zr
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The microstructure, mechanical properties and fracture behavior of magnesium alloy Mg – 10% Gd – 3% Y – 0.6% Zr is studied in cast condition and after T4 and T6 treatments. It is shown that in cast condition the alloy contains an α-phase (a magnesium-base solid solution) and a Mg24(Gd, Y)5 eutectic phase. After the solution treatment the eutectic phase dissolves in the α-matrix containing cuboid particles of a phase enriched with gadolinium and yttrium. The hardness and the tensile strength criteria are used to determine the optimum treatment for the cast alloy, i.e., 8-h solution treatment at 500°C and 16-h aging at 220°C (T6). This mode of heat treatment provides the best mechanical properties.
Key wordsmagnesium alloys heat treatment microstructure mechanical properties fracture
The work has been supported by the Project of International Cooperation of the Ministry of Science and Technology of China (No. 2014DFA50320), the National Foundation for Natural Sciences of China (No. 51674226, 51574207, 51574206, 51204147, 51274175), the Project on International Technological Cooperation of the Shanxi Province (No. 2015081041), and the Project on Science and Technology of the Shanxi Province (No. 2015031012).
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