Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 565, Issue -, Pages 250-257Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.12.035
Keywords
AM-SC1 alloy; Fatigue property; Solution temperature; Residual secondary compound; Fracture surface
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Funding
- General Motors Global Research and Development (GM R&D), Warren, MI, USA
- Shanghai Jiao Tong University (SJTU), Shanghai, China
- China National 863 Program [2009AA033501]
- National Natural Science Foundation of China [51201103]
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The microstructure, tensile properties and high cycle rotary bending fatigue behavior of low pressure sand cast (LPSC) AM-SC1 Mg alloy, solution-treated at 525, 540 and 560 degrees C respectively and then aged at 215 degrees C, were studied. The solution temperature has little influence on the average grain size of LPSC AM-SC1 alloy, but decreases the size and content of the residual secondary compounds when solution temperature increases. Compared with the alloy solution treated at 525 and 540 degrees C, the alloy treated at 560 degrees C shows obviously higher yield strength (+19 MPa) and ultimate tensile strength (+24 MPa), comparable elongation, and higher rotary bending fatigue strength (+8 MPa). However, when the fatigue stress amplitude is higher than the fatigue strength, the 560 degrees C solution treated alloy shows an obvious lower fatigue life. The fatigue fracture behavior of LPSC AM-SC1 alloy was discussed as well in this paper. (C) 2012 Elsevier B.V. All rights reserved.
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