ＡＺ３１Ｂマグネシウム合金押出材の繰返し変形挙動および疲労特性
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Cyclic compressive and tensile loading-unloading tests were carried out using cylindrical smooth specimens of extruded AZ31B magnesium alloy. Load-controlled axial fatigue tests were also carried out with smooth specimens attached on strain gages at specified stress amplitudes levels. Monotonic tensile and compressive 0.2% proof stresses were 210 MPa and 105 MPa, respectively. Ratios of compressive/tensile 0.2% proof stress was approximately 0.50. Pseudoelastic behaviors were observed in compressive and tensile loading-unloading tests. The large anelastic strains were observed in compressive stress–strain hysteresis loops. The fatigue limit of load-controlled axial at 107 cycles was 90 MPa. Stress–strain hysteresis loops were linear in tensile and compressive phases at the lower stress amplitude of fatigue limit and the complicated pseudoelastic deformations were observed in tensile and compressive phases at the higher stress amplitude of fatigue limit of load-controlled axial fatigue test. Compressive mean strain generated by cyclic pseudoelastic deformations at the higher stress amplitude of fatigue limit. The deformation twins were observed in the specimen subjected to the higher stress amplitude of fatigue limit and free deformation twins were observed in the specimen subjected to the lower stress amplitude of fatigue limit. Fatigue cracks initiated at the secondary particle/matrix interface or broken secondary particle near the surface. Subsequently, small cracks tended to grow through transgranular.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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