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首页> 外文会议>Symposium Proceedings vol.842; Symposium on Integrative and Interdisciplinary Aspects of Intermetallics; 20041129-1201; Boston,MA(US) >In-situ Observation of Surface Relief Formation and Disappearance during Order-Disorder Transition of Equi-atomic CuAu alloy using Laser Scanning Confocal Microscopy
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In-situ Observation of Surface Relief Formation and Disappearance during Order-Disorder Transition of Equi-atomic CuAu alloy using Laser Scanning Confocal Microscopy

机译：用激光扫描共聚焦显微镜原位观察等原子CuAu合金有序无序过渡过程中表面浮雕的形成和消失

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摘要

In-situ observation of the formation and disappearance of the surface relief associated with the twinning during the order-disorder transitions among CuAu-Ⅰ (L1_0), CuAu-Ⅱ (PAP) and disordered fcc phases was conducted using Confocal Scanning Laser Microscopy equipped with a gold image furnace. The Retro effect was confirmed in poly-crystal samples, however no evidence was found in single-crystal samples. Also observed in poly-crystal samples are that the disordering temperature detected by the disappearing of relieves is different from grain to grain, and that grain boundary cracking alleviates the Retro effect. The observed phenomena were explained based on the crystallographic orientation relationship among grains investigated by FESEM/EBSD in terms of the elastic strain effect around grain boundaries induced by transition. It was confirmed that in each grain the surface relieves correspond to a set of two {011} planes having a < 100 > axis perpendicular to both planes in common. It was also found that the larger the average strain of two neighboring grains is, the lower the transition temperature. This observation was explained by the stress effect on the stability of a phase.
机译：使用配备有金像炉。在多晶体样品中证实了Retro效应，但是在单晶样品中没有发现证据。在多晶样品中还观察到，通过浮雕消失而检测到的无序温度因晶粒而异，并且晶界裂纹减轻了逆向效应。根据FESEM / EBSD研究的晶粒之间的晶体取向关系，根据过渡引起的晶界周围的弹性应变效应解释了观察到的现象。可以确认，在每个晶粒中，表面起伏都对应于一组两个{011}平面，它们共同具有垂直于两个平面的<100>轴。还发现两个相邻晶粒的平均应变越大，转变温度越低。应力对相稳定性的影响解释了这一观察结果。

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