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Austenite Stability Under Focused Ion Beam Milling

机译:聚焦离子束铣削下的奥氏体稳定性

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Artifacts from FIB milling can be of great concern. Aside from commonly known defects (e.g., Ga ion implantation, re-deposition, microstructure change due to specimen temperature increase, surface amorphization, etc.), FIB milling can even result in phase transformation in some metal alloys. Limited study has shown normal incident Ga ion beam milling which can transform austenite (FCC) to BCC structure in some stainless steels. This can be detrimental when austenite in stainless steels needs to be analyzed. However, one important question to answer is if milling in high glancing angle can result in such transformation. The susceptibility of austenite transformation to BCC structure is studied using EBSD on commercial stainless steels. When irradiated by normal incidence Ga ion beam, even with low dose, surface of SS304 and SS316 was transformed from austenite to BCC structure. However, irradiation from high glancing angle does not result in such transformation of relatively unstable austenite structure in SS304.
机译:来自FIB MIRLING的文物可能是非常关注的。除了众所周知的缺陷(例如,GA离子注入,再沉积,由于样品温度的增加,表面杂化等),FIB铣削甚至可以导致一些金属合金中的相变。有限的研究表明了正常的入射GA离子束铣削,可在一些不锈钢中将奥氏体(FCC)转化为BCC结构。当需要分析不锈钢中的奥氏体时,这可能是有害的。然而,回答的一个重要问题是在高透明角度铣削可能导致这种转变。使用EBSD在商业不锈钢上使用EBSD研究了奥氏体转化对BCC结构的敏感性。当由正常入射GA离子束照射时,即使具有低剂量,SS304和SS316的表面也从奥氏体转化到BCC结构。然而,来自高透明角度的照射不会导致SS304中相对不稳定的奥氏体结构的这种转化。

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