|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Low Cyclic Fatigue of Light Alloys with a Bimodal Grain Size Distribution
||Evgeniya Skripnyak, Nataliya V. Skripnyak, Vladimir A. Skripnyak, Vladimir V. Skripnyak
|On-Site Speaker (Planned)
New experimental data on the low cyclic fatigue (LCF) of АMg6 (Al 1560) aluminum alloy, and Ma 8-1 magnesium alloy with unimodal and bimodal distributions of grain size are presented. Fatigue tests at frequency loading of 1Hz were executed under symmetrical tensile-compression loading regime (R= -1). The linear curves of lg N (N is a number of cycles before fracture) versus Δσ/2 (stress amplitude) in the low fatigue region were obtained for all types of alloys specimens. The creation of bimodal grain size distribution or the gradient grains structure in an aluminium and magnesium alloys causes changing of kinetics of fatigue cracks growth. Local changing in propagation direction of fatigue crack occurs as affected the residual compression stresses induced in the structured surface layers.The fatigue life of light alloys with a gradient structure of grains can be increased by 10… 15% at LCF.
||Planned: A print-only volume