Temperature evolution mechanism of AZ31B magnesium alloy during high-cycle fatigue process

Thermographic analysis of the fatigue heating process for AZ31B magnesium alloy

“…Since the heat-dissipation rate is closely related to the plastic strain [10,14,24], work-hardening effect could be a reasonable explanation for the presence of the HDR hump in Fig. 6.…”

“…Table 1 Thermophysical properties of the AZ31B magnesium alloy [15]. The temperature evolution during fatigue without an outside heat source could be mainly affected by thermoelastic effect, intrinsic dissipation, and heat-transfer [10,13,14]. Therefore, the other internal coupling sources s ic and the external volume heat supply r ext could be neglected for their effect to the temperature evolution during fatigue process is very limited, and the local heat Eq.…”

“…It is a significant contribution of work generated by plastic deformation to be converted into heat, if the body is stressed above its fatigue limit [14]. Thus, the heat production obviously increases under the applied stresses.…”

“…For applications in aerospace industry and automobile manufacturing, magnesium alloys often undergo fatigue loading. Therefore, it is of great significance to strengthen the research on rational utilization of magnesium alloy, a typical close-packed hexagonal structure material, which has particular fatigue properties [12][13][14].…”

“…In the previous work, the fatigue behavior of AZ31B magnesium alloy and its butt joints were investigated by using infrared thermographic method [12][13][14]. The highest temperature evolutions of the specimen surface were observed in a small part that was located in the center of the specimen.…”