Role of deformation twins in static recrystallization kinetics of high-purity alpha titanium

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• 作者：Jong Woo Won ; Taekyung Lee ; Seong-Gu Hong…
• 关键词：metals ; annealing ; recrystallization ; electron backscattering diffraction (EBSD) ; twinning
• 刊名：Metals and Materials International
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：22
• 期：6
• 页码：1041-1048
• 全文大小：2,947 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials
  Operating Procedures and Materials Treatment
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2005-4149
• 卷排序：22

文摘

The importance of deformation twins in static recrystallization kinetics of high-purity alpha titanium was investigated by carrying out thermal annealing tests of deformed materials in combination with electron-backscatterdiffraction- based microstructural analysis. Prior to thermal annealing, the material was compressed to a true strain of 0.22 along three directions to introduce different twinning characteristics. Our results showed that deformation twins substantially promoted the static recrystallization process by deepening the microstructural inhomogeneity induced by the formation of twin boundaries and twinning-induced crystallographic lattice reorientation. Twin morphology was also observed to be important because it influenced the extent of microstructural inhomogeneity. Intersecting twin morphology, caused by the activation of multiple twin variants, was more effective than parallel twin morphology, caused by the activation of a single twin variant (or a twin variant pair), because it gave rise to more twin boundaries, more twin boundary junctions (intersections, triple junctions, etc.), and greater in-grain crystallographic orientation spread.