Microstructural evolution and FCC twinning behavior during hot deformation of high temperature titanium alloy Ti65
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第14期
论文作者：Zhixin Zhang Jiangkun Fan Bin Tang Hongchao Kou Jian Wang Xin Wang Shiying Wang Qingjiang Wang Zhiyong Chen Jinshan Li
文章页码：56 - 69
摘 要：Although the development of titanium alloys with working temperatures above 600?C faces enormous difficulties and challenges, the related research has not stopped. In the present work, detailed analyses on microstructure evolution and hot deformation behavior of a new temperature resistant 650?C titanium alloy Ti65 were investigated from micrometer scale to nanometer scale. The results revealed that lamellarα grains gradually fragmentized and spheroidized during the α+β phase region compression and the orientation of the c-axis of α grains gradually aligned to radial directions, forming two high Schmid factors（SFs） value texture eventually with the increase of strain to 0.7. Moreover, there were some strengthening characters in the α+β phase region such as lenticular αsand nano silicide（TiZr）6 Si3. In the β phase region, fine equiaxed dynamic recrystallized（DRX） β grains were formed. Besides, the variant selection of α m′artensite followed Burgers orientation relationship during the compression process. The main deformation mechanisms of the α+β phase region were dislocation slip and orientation dependent spheroidization. Whereas, the deformation process in the β phase region was controlled by β grain DRX.Interestingly, many nano scale FCC twins were generated at the interface of αl′ath during deforming in the β phase region, which was firstly observed in Ti65 alloy.
Zhixin Zhang1,2，Jiangkun Fan1,3，Bin Tang1,3，Hongchao Kou1,3，Jian Wang2，Xin Wang2，Shiying Wang4，Qingjiang Wang5，Zhiyong Chen5，Jinshan Li1,3
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University2. Baoti Group Ltd.3. National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials4. School of Materials Science and Engineering, Changzhou University5. Institute of Metal Research, Chinese Academy of Sciences
摘 要：Although the development of titanium alloys with working temperatures above 600?C faces enormous difficulties and challenges, the related research has not stopped. In the present work, detailed analyses on microstructure evolution and hot deformation behavior of a new temperature resistant 650?C titanium alloy Ti65 were investigated from micrometer scale to nanometer scale. The results revealed that lamellarα grains gradually fragmentized and spheroidized during the α+β phase region compression and the orientation of the c-axis of α grains gradually aligned to radial directions, forming two high Schmid factors（SFs） value texture eventually with the increase of strain to 0.7. Moreover, there were some strengthening characters in the α+β phase region such as lenticular αsand nano silicide（TiZr）6 Si3. In the β phase region, fine equiaxed dynamic recrystallized（DRX） β grains were formed. Besides, the variant selection of α m′artensite followed Burgers orientation relationship during the compression process. The main deformation mechanisms of the α+β phase region were dislocation slip and orientation dependent spheroidization. Whereas, the deformation process in the β phase region was controlled by β grain DRX.Interestingly, many nano scale FCC twins were generated at the interface of αl′ath during deforming in the β phase region, which was firstly observed in Ti65 alloy.
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