A comparison of low-cycle fatigue behavior between the solutionized and aged Mg-3Nd-0.2Zn-0.5Zr alloys
作者： Zhenming Li , Hui Zou , Jichun Dai , Xuejiao Feng , Ming Sun
DOI: 10.1016/J.MSEA.2017.04.047
关键词: Composite material 、 Metallurgy 、 Fatigue limit 、 Hardening (metallurgy) 、 Number density 、 Volume fraction 、 Cyclic stress 、 Crystal twinning 、 Alloy 、 Materials science 、 Magnesium
摘要: Abstract The present paper compares the low cycle fatigue characteristics between solution-treated (T4) and peak-aged (T6) Mg-3Nd-0.2Zn-0.5Zr magnesium alloys produced by semi-continuous casting. cyclic stress amplitudes of T6-treated counterpart are higher than those T4-treated alloy, which is due to precipitate strengthening. At same amplitude, alloy with hysteresis energies undergoes more damage, resulting in shorter lives. For amplitude found increase increasing number, attributed its soft matrix increased volume fraction number density twins under continuous loading. Cyclic hardening followed decrease observed alloy. It shown that deformation behavior failure mechanism dependent on dislocations-slip plus twinning, while dislocations-slip. Based discussion, Coffin-Manson law Basquin equation or energy-based concepts can be well applied prediction LCF lives NZ30K alloys.
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