文献类型：期刊文献

英文题名：Effect of aging temperature on mechanical properties of TC21 alloy with multi-level lamellar microstructure

作者：Ye, Xianwei Wan, Mingpan Huang, Chaowen Lei, Min Jian, Shichao Zhang, Yuan Xu, Dan Huang, Fang

第一作者：Ye, Xianwei

通信作者：Lei, M[1]

机构：[1]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;[2]Key Lab Mat Struct & Strength Guizhou Prov, Guiyang 550025, Peoples R China;[3]Natl Local Coconstruct Engn Lab High Performance, Guiyang 550025, Peoples R China;[4]Guizhou Anda Aviat Forging Co Ltd, Anshun 561000, Peoples R China;[5]Guizhou Inst Technol, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China.

年份：2022

卷号：840

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20221111798042);Scopus(收录号：2-s2.0-85126282961);WOS:【SCI-EXPANDED(收录号:WOS:000781903100001)】；

基金：This work was supported by the Science and Technology Program of Guizhou province (Nos. [2020] 1Y196, [2020] 2Y021 and [2021] 310) and the National Natural Science Foundation of China (Nos. 51801037, 52061005 and 52001253) . We also appreciate the Postdoctoral Science Foundation of China (No.2020M683656XB) , the Program of Guizhou Institute of Technology (No. XJGC20190950) .

语种：英文

外文关键词：TC21 alloy; Multi-level lamellar microstructure; Element distribution; Aging temperature; Mechanical properties

摘要：This paper aims to reveal the effect of aging temperature on strength, impact toughness and fracture toughness of TC21 alloy with multi-level lamellar microstructure. The multi-level lamellar microstructures of TC21 alloy were prepared by solid solution at 1000 C, annealing at 800 C and respectively aging at 550 C, 600 C and 650 C. The multi-level structures include beta grains, alpha colony (alpha(c)), primary alpha phase (alpha(p)) and aged alpha plates (alpha(s)). The microstructures were performed on using optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), laser scanning confocal microscope (LSCM) and image analysis software. Results show that as aging temperature goes up, the size of alpha s increases and the segregation of alloy elements increases, while the beta grain, grain boundary alpha phase (G(alpha)) and alpha c almost remain unchanged. Hall-Petch formula is used to reveal that alpha s phase is the minimum control unit of strength. Fine grain strengthening, volume fraction of alpha phase (V-alpha) and element segregation have great influence on mechanical properties. In the impact experiment, microstructure deformation and secondary cracks consume more energy, while cleavage fracture consumes less energy. The TEM analysis found that the coordination of microstructure deformation became worse after aging. Fracture analysis shows that the size of alpha(c) plays an important role in crack propagation, and the crack propagation path always tends to cut alpha c vertically and pass through it. Whether the size of alpha(c) is large or small, it is not conducive to the increase of crack propagation path. Crack propagation path length and the interface energy consumed by different fracture mechanisms should be taken into consideration when there are more crack propagation paths and the fracture toughness decreases in the multi-level lamellar microstructure of TC21 alloy.