Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 21, Issue 10, Pages 2168-2174Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(11)60990-4
Keywords
Mg-Sn-Mn alloy; heat treatment; microstructure; mechanical properties
Categories
Funding
- National Natural Science Foundation of China [50725413]
- National Basic Research Program of China [2007CB613704]
- Science and Technology Program of Chongqing, China [2010AC4085, 2009AB4134, 2006AA4012-9-6]
- Program for Hundreds of Distinguished Leading Scientists of CQ CSTC, China [2010CSTC-HDLS]
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The effects of heat treatment on the microstructure and mechanical properties of Mg-3Sn-1Mn alloy were preliminarily investigated by using optical and electron microscopy, X-ray diffraction (XRD) analysis, and tensile and creep test. The results indicate that the heat treatment has an obvious effect on the microstructure and mechanical properties of the Mg-3Sn-1Mn alloy. After the solid solution treatment at 420 degrees C, a majority of the Mg2Sn phases in the alloy are dissolved into the matrix. However, after the further aging treatment at 250 degrees C, lots of fine Mg2Sn phases in the aged alloy are precipitated at the grain boundaries and within the grains. As a result, the tensile and creep properties of the aged alloy are significantly improved. The mechanism for the higher tensile and creep properties of the aged alloy is related to the dispersive distribution of the Mg2Sn phase in the alpha-Mg matrix.
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