Effect of solid solution hardening and stacking fault energy on plastic flow and acoustic emission in Cu–Ge alloys

Cluster Analysis of Acoustic Emissions Measured during Deformation of Duplex Stainless Steels

“…Besides, while the continuous AE, which is associated with strain hardening due to dislocation storage in metals, tends to diminish with strain, mechanical twinning is supposed to generate AE bursts over a wide range of strain until fracture as has been observed, for example, in early studies on Cu 9%Ge alloy. 7) A similar pattern of AE bursts emerging through the entire deformation is evidently observed in the SUS 316L samples, Fig. 2.…”

Recovery Behaviour of Pure Magnesium in Cyclic Compression–Quick Unloading-Recovery Process at Room Temperature Investigated by AE

“…The AE signals in the anelastic recovery process are reasonably thought to be due to the detwinning process, because the detwinning process is a very important source of AE and the anelastic recovery of pure magnesium is related to detwinning closely. 6) It is thought that the anelastic recovery strain is due to at least two mechanisms, detwinning and the annihilation of dislocations where the annihilation of dislocations is a thermal activated process 15) and the elastic energy released is too weak to be detected by present AE system. From above explanation, it can be known that the anelastic recovery by detwinning and the overall anelastic recovery process (both detwinning and dislocation annihilation) are different.…”

“…10(a). Equation (6) shows the behaviour of AE count rate in the anelastic recovery process. The decreasing rate of AE count rate shows a decrease of detwinning rate with the increase of recovery time.…”

“…5) Lots of researches about the cyclic transition behaviour of MT by AE technique have been conducted because the twinning and detwinning processes are strong AE sources and the dynamic internal structure evolution can be analyzed effectively by AE. 6) Magnesium demonstrates different behaviour and mechanism in loading and the following unloading process compared with the other materials without the pseudoelasticity. The fatigue and energy absorption, when magnesium or its alloys are used as the damping structure, are also affected by such cyclic movements of twinning boundaries.…”

“…Besides, the unloading curve of magnesium is composed of both the elastic and anelastic unloading curves which are not separated automatically, and it is difficult to analyze the anelastic recovery behaviour and mechanism independently. 6,7) In the previous research, 8,9) the anelastic recovery behaviour of magnesium was obtained by unloading the specimen with relatively high speed so that anelastic recovery lags behind elastic recovery and were analyzed independently. AE measurement was applied to investigate the behavior of anelastic recovery process.…”