Formation of Twins During Thermal Fatigue of Magnesium Wrought Alloy AZ31
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概要
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Results of thermal fatigue tests of the magnesium base alloy AZ31 for the case of out-of-phase-loading in a temperature range between -50°C and +290°C are presented. Specimens were loaded under constant total strain and uniaxial homogeneous stress. The thermal fatigue behavior is described by the resulting stress amplitudes, plastic strain amplitudes and mean stresses as a function of the number of thermal loading cycles. It is well known that rolled AZ31 shows different stress-strain behavior during tensile and compressive loading at lower temperatures due to the fact that mechanical twinning occurs preferentially during the compression loading phase and not during tension. However untwinning processes may occur during the tensile phase of a loading cycle. As a consequence, during the first thermal loading cycles, typical consequences of the formation and the dissolution of twins can be observed. The interaction of deformation, recovery and recrystallization processes, characteristic for individual temperature ranges are discussed in detail to analyze the damage progress during thermal fatigue.
- 一般社団法人 日本機械学会の論文
著者
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KRAUSS Martin
Department of Mechanical Engineering, Institute of Materials Engineering, University of Kassel
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SCHOLTES Berthold
Department of Mechanical Engineering, Institute of Materials Engineering, University of Kassel