1311 Fatigue Behavior of Mg_2Si-Dispersed Magnesium Alloys Fabricated by Solid-State Synthesis

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  • 1311 固相合成法によるMg_2Si分散マグネシウム合金の疲労挙動(S21-1 軽金属の疲労,S21 金属材料の疲労特性と破壊機構)

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Mg_2Si-dispersed magnesium alloys were produced by solid-state synthesis using AZ31 and SiO_2 powders as starting materials in which two different powder sizes in AZ31 were used. Then extrusion was applied to produce bars of 24mm diameter. Rotating bending fatigue tests were performed using smooth specimens of the extruded materials in laboratory air at ambient temperature. It was found that Mg_2Si-dispersed Mg alloys showed lower fatigue strength than the extruded AZ31 alloy and the fatigue strength of the material using coarse powder decreased significantly. Fatigue cracks always initiated from large particles immediately after cyclic loading was applied and subsequent small crack growth was faster than the extruded AZ31 alloy. It was concluded, therefore, that the decrease of the fatigue strength of Mg_2Si-dispersed Mg alloys was attributed to the premature crack initiation from particles and faster small crack growth and the observed powder size dependence of fatigue strength was due to difference in the size of the particle from which the crack initiated.

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