电子背散射衍射
材料科学
极限抗拉强度
晶体孪晶
打滑(空气动力学)
拉伸试验
变形机理
复合材料
合金
冶金
扫描电子显微镜
晶界
微观结构
热力学
物理
作者
Shixing Huang,Qinyang Zhao,C.Y. Lin,Chao Wu,Yongqing Zhang,Weiju Jia,Chengliang Mao
标识
DOI:10.1016/j.msea.2021.140958
摘要
Tensile behaviors of Ti–6Al with extra low interstitial (ELI) have been systematically investigated using the in-situ tensile testing monitored by the scanning electron microscopy (SEM). The electron backscatter diffraction (EBSD) technique was employed to reveal the detailed deformation mechanisms during the in-situ tensile process. The results showed that multiple slip activities occurred during the in-situ tensile process. Moreover, prismatic and basal slips dominated the slip activities. To accommodate the increased macrostrain under the tensile loading, coordinated deformation mechanisms were involved in the tensile process, including crystalline orientation rotation, slip transmission and deformation twinning. α grains were rotated about 9.8 (±4)° for convenience of slip activation to accommodate the macrostrain when the tensile displacement reached to 0.4 mm. Slip transmission supplied the intergranular coordinated deformation which avoided the localized stress concentration at grain boundaries. Deformation twinning accommodated the intragranular strain in α grains with hard orientations. Furthermore, the mechanisms for microcrack formation was thoroughly investigated by combining the in-situ SEM observations with the EBSD technique. Localized stress concentration at the grain boundaries derived from the geometric incompatibility between neighboring α grains were mainly responsible for the microcrack formation in Ti–6Al ELI alloy.
科研通智能强力驱动
Strongly Powered by AbleSci AI