Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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The Study of the Variation of Strain Rate Sensitivity Index depending on the Strain and Microstructural Observations of AZ31 Mg Alloy Sheet

변형율에 따른 AZ31 합금의 변형율 속도 민감도 지수 변화와 미세조직 특성에 관한 연구

  • 김동옥 (자동차부품연구원 금속소재공정연구센터) ;
  • 강찬우 (자동차부품연구원 금속소재공정연구센터) ;
  • 이수연 (전남테크노파크 신소재기술산업화지원센터)
  • Received : 2011.08.23
  • Accepted : 2011.09.28
  • Published : 2011.11.01
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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.

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References

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