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http://dx.doi.org/10.5228/KSTP.2011.20.7.498

The Study of the Variation of Strain Rate Sensitivity Index depending on the Strain and Microstructural Observations of AZ31 Mg Alloy Sheet  

Kim, D.O. (자동차부품연구원 금속소재공정연구센터)
Kang, C.W. (자동차부품연구원 금속소재공정연구센터)
Lee, S.Y. (전남테크노파크 신소재기술산업화지원센터)
Publication Information
Transactions of Materials Processing / v.20, no.7, 2011 , pp. 498-503 More about this Journal
Abstract
The strain rate sensitivity index, m, plays an important role in plastic deformation at elevated temperatures. It is affected by strain rate, temperature, and the microstructure of the material. The strain rate sensitivity index has been used as a constant in numerical analysis of plastic forming at a specified strain rate and temperature. However, the value of m varies as deformation proceeds at an elevated temperature and a certain strain rate. Thus, in this present study, the value of m has been characterized as a function of strain by multiple tensile jump tests for AZ31 magnesium alloy sheet, and the variation of m has been discussed in conjunction with the microstructural observations before and after deformation. The experimental results show that the variation of m is dependent on the temperature and strain rate. Grain growth with dynamic recrystallization also affects the variation of m.
Keywords
Magnesium Alloy; Strain Rate Sensitivity; Microstructural Observation; Strain; Temperature; Strain rate;
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Times Cited By KSCI : 1  (Citation Analysis)
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