TC21合金片层组织特征对其断裂韧性的影响-中国有色金属学报.PDF

20 1 2010 10 Vol.20 Special 1 The Chinese Journal of Nonferrous Metals Oct. 2010 1004-0609(2010)S1-s0016-05 TC21 1 1 1 1 2 3 1 (1. 710072 2. 100095 3. 710021) TC21 β (ααα) TC21 ααααα α TC21 TG 146 A Influence of lamellar microstructure feature on fracture toughness of TC21 alloy 1 1 1 1 2 3 1 DANG Wei , XUE Xiang-yi , LI Jin-shan , HU Rui , ZHU Zhi-shou , ZHANG Feng-shou , ZHOU Lian (1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; 2. Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Beijing 100095, China; 3. Western Superconducting Technologies Co., Ltd., Xi’an 710021, China) Abstract: In order to analyze the relationship between lamellar microstructure feature (thickness of α laths, width of α lath at grain boundary and α colony size) and fracture toughness, the microstructures and fracture toughness of TC21 alloy cooled from β phase field with different slow rates were investigated. The results show that α colony size together with α laths thickness and width of α lath at grain boundary is decreased with increasing cooling rates, leading to the decrease of fracture toughness. It is positive for fracture toughness to decrease width of α lath at grain boundary, α laths thickness and α colony size. Key words: TC21 alloy; lamellar microstructure feature; fracture toughness TC21 Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb [4]β (β β σ=1 100