Influence of Plastic Deformation and Aging Process on Microstructure and Tensile Properties of Cast Ti-6Al-2Sn-2Zr-2Mo-1.5Cr-2Nb-0.1Si Alloy  

作　　者：Mostafa S. S. El-Deeb Khaled M. Ibrahim S. S. Mohamed Ramadan N. Elshaer Mostafa S. S. El-Deeb;Khaled M. Ibrahim;S. S. Mohamed;Ramadan N. Elshaer(Modern Academy for Engineering and Technology, Cairo, Egypt;Central Metallurgical R & D Institute, Cairo, Egypt;Shoubra Faculty of Engineering, Benha University, Cairo, Egypt;Tabbin Institute for Metallurgical Studies, Cairo, Egypt)

机构地区：[1]Modern Academy for Engineering and Technology, Cairo, Egypt [2]Central Metallurgical R & D Institute, Cairo, Egypt [3]Shoubra Faculty of Engineering, Benha University, Cairo, Egypt [4]Tabbin Institute for Metallurgical Studies, Cairo, Egypt

出　　处：《Open Journal of Metal》2021年第2期11-20,共10页金属学报（美国）

摘　　要：In the present work, titanium alloy with a composition of Ti-6.5Al-3Mo-1.9Nb-2.2Sn-2.2Zr-1.5Cr (TC21) was subjected to plastic deformation and aging processes. A Plastic deformation at room temperature with 2%, 3% and 4% stroke strain was applied on the studied samples. Then, the samples aged at 575<span style="white-space:nowrap;">°</span>C for 4 hr. By applying different plastic deformation ratios, the structure revealed an elongated and thin <em>β</em>-phase embedded in an <em>α</em>-phase. Secondary <em>α</em>-platelets were precipitated in the residual <em>β</em>-phase. Maximum hardness (HV440) was obtained for 4% deformed + aged samples. Minimum hardness (HV320) was recorded for the as-cast samples without deformation. The highest ultimate tensile strength of 1311 MPa was obtained for 4% deformed + aged samples due to presence of high amount of dislocation density as well as precipitation of secondary <em>α</em>-platelets in the residual <em>β</em>-phase. The lowest ultimate tensile strength of 1020 MPa was reported for as-cast samples. Maximum elongation of 14% was registered for 4% deformed + aged samples and minimum one of 3% was obtained for as-cast samples. Hence, strain hardening + aging can enhance considerably the elongation of TC21 Ti-alloy up to 366% and 133% in case of applying 4% deformation + aged compared to as-cast and aged samples without applying plastic deformation, respectively.In the present work, titanium alloy with a composition of Ti-6.5Al-3Mo-1.9Nb-2.2Sn-2.2Zr-1.5Cr (TC21) was subjected to plastic deformation and aging processes. A Plastic deformation at room temperature with 2%, 3% and 4% stroke strain was applied on the studied samples. Then, the samples aged at 575<span style="white-space:nowrap;">°</span>C for 4 hr. By applying different plastic deformation ratios, the structure revealed an elongated and thin <em>β</em>-phase embedded in an <em>α</em>-phase. Secondary <em>α</em>-platelets were precipitated in the residual <em>β</em>-phase. Maximum hardness (HV440) was obtained for 4% deformed + aged samples. Minimum hardness (HV320) was recorded for the as-cast samples without deformation. The highest ultimate tensile strength of 1311 MPa was obtained for 4% deformed + aged samples due to presence of high amount of dislocation density as well as precipitation of secondary <em>α</em>-platelets in the residual <em>β</em>-phase. The lowest ultimate tensile strength of 1020 MPa was reported for as-cast samples. Maximum elongation of 14% was registered for 4% deformed + aged samples and minimum one of 3% was obtained for as-cast samples. Hence, strain hardening + aging can enhance considerably the elongation of TC21 Ti-alloy up to 366% and 133% in case of applying 4% deformation + aged compared to as-cast and aged samples without applying plastic deformation, respectively.

关 键 词：TC21 Ti-Alloy Strain Hardening MICROSTRUCTURE Aging Hardness TENSILE 

分 类 号：TG1[金属学及工艺—金属学]