晶体孪晶
材料科学
电子背散射衍射
原位
钛
衍射
转化(遗传学)
冶金
相(物质)
钛合金
结晶学
热力学
微观结构
光学
合金
基因
气象学
有机化学
化学
物理
生物化学
作者
Siyu Lu,S.L. Lu,Biao Chen,Ma Qian,Q. Wei,Katsuyoshi Kondoh,Jianghua Shen
标识
DOI:10.1016/j.scriptamat.2023.115350
摘要
In this work, in-situ high temperature electron back-scatter diffraction (HT-EBSD) was designed to investigate the phase transformation in Grade 1 commercially pure titanium (CP Ti). The transformation from α-Ti to β-Ti during the heating process mostly followed the Burgers orientation relationship (BOR). However, {112¯1}<1¯1¯26>tensile twinning was found to occur during the β-Ti to α-Ti transformation in the continuous cooling process, which led to the formation of Type 2 α-variants that defied the BOR. This was not reported before for CP Ti, while similar previous observations were all associated with Ti alloys containing β-stabilizer(s). We attribute this observation to the relatively fast cooling process (16 °C/s) where the lattice mismatch between the β-Ti and α-Ti phases has introduced a sufficiently large internal stress within a short time. Diffusional-displacive mixed transformation was proposed for the β-Ti to α-Ti transformation, which can reasonably explain the observations in this work.
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