通过对挤压变形Mg-x%Al-3%Ni(x=4,5,6,7,质量分数)合金进行总应变控制模式的室温疲劳实验,研究了不同Al含量的挤压变形Mg-x%Al-3%Ni合金的循环应力响应.疲劳寿命和循环应力-应变行为.结果表明:不同Al含量的挤压变形Mg-x%Al-3%Ni合金均表现为循环应变硬化;挤压变形Mg-x%A1-3%Ni合金的应变疲劳寿命与塑性应变幅、弹性应变幅间的关系分别服从Coffin-Manson和Basquin关系式.
Due to the low density,high specific strength and stiffness,magnesium alloys are being considered for automotive and aerospace applications.The structural applications of magnesium components need a decent low-cycle fatigue performance,because cyclic loading is often encountered. In order to identify the low-cycle fatigue behavior of the newly developed Mg-x%Al-3%Ni(x=4,5,6,7,mass fraction)extruded magnesium alloys with different contents of Al,the total strain-controlled low-cycle fatigue tests were performed at room temperature.The cyclic stress response,strain fatigue Iire and cyclic stress-strain behaviors were investigated for the hot-extruded Mg-x%Al-3%Ni alloys.The results of the low-cyclic fatigue tests show that the hot-extruded Mg-x%A1-3%Ni alloys exhibit the cyclic strain hardening during fatigue deformation.The dependences of the strain fatigue life on plastic strain amplitude and elastic strain amplitude can be described by the Coffin-Manson and Basquin equations,respectively.In the hot extruded Mg-x%Al-3%Ni alloys with different contents of A1,the extruded Mg-5%Al-3%Ni alloy gives the longest fatigue life and the highest fatigue resistance. In addition,a linear relation between the cyclic stress amplitude and cyclic strain amplitude Can be noted for the hot-extruded Mg-x%Al～3%Ni alloys.KEY WoRDS Mg-x%Al-3%Ni alloy,hot-extrusion,cyclic stress response,fatigue life,cyclic 8tress-strain
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