In this study, the mechanical behavior of crystal group of hexagonal close-packed (hcp; α phase) and body-centered cubic (bcc; β phase) during tensile loading was investigated to elucidate the mechanism from elastic to plastic deformation transition of the rolled LZ91 Mg alloy using transmission-X-ray diffraction (transmission-XRD) measurement, transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS). The approximate proof stress of the LZ91 Mg alloy sample was found that the lattice strain retained the expanded state from 0.6% nominal strain, and the transmission-XRD measurement characterized the crystalline behavior during the transition by the integrated intensity of crystal group hcp(100). The lattice strain of bcc(110) decreased from the 0.6% nominal strain due to dislocation activity, which occurred near β/β grain boundary. In addition, we performed the analyses of electron energy loss spectroscopy (EELS) modes, the Li-K peak disappeared from the segregated Li regions of 10–60 nm near β/β grain boundary at the nominal strain of 0.8%. Understanding this mechanical behavior during the elastic to plastic deformation transition by transmission-XRD is crucial for the development of Mg-Li alloys.

中文翻译：

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拉伸载荷作用下LZ91镁合金轧制变形转变的表征


本研究利用透射 X 射线衍射 （transmission-XRD） 测量、透射电子显微镜 （TEM）、扫描透射电子显微镜 （STEM）、 研究了六方密堆积 （hcp，α相） 和体心立方 （bcc，β相） 晶体在拉伸载荷过程中的机械行为，以阐明轧制 LZ91 Mg 合金从弹性到塑性变形的转变机制。 能量色散 X 射线光谱 （EDS）。LZ91 Mg 合金样品的近似屈服应力发现，晶格应变保留了 0.6% 标称应变的膨胀态，透射 XRD 测量通过晶族 hcp （100） 的积分强度表征了转变过程中的晶体行为。由于位错活动，bcc（110） 的晶格应变从 0.6% 的标称应变降低，位错活动发生在 β/β 晶界附近。此外，我们进行了电子能量损失谱 （EELS） 模式分析，在 0.8% 的标称应变下，Li-K 峰从 β/β 晶界附近 10–60 nm 的偏离 Li 区消失。了解透射 XRD 在弹性到塑性变形转变过程中的这种机械行为对于 Mg-Li 合金的开发至关重要。