WNAG Yandong;YANG Wangyue;CHEN Guoliang;ZHU Shijie University of Science and Technology Beijing; Institute of Metal Research; Academia Sinica; Shenyang
Cite this article:
WNAG Yandong;YANG Wangyue;CHEN Guoliang;ZHU Shijie University of Science and Technology Beijing; Institute of Metal Research; Academia Sinica; Shenyang. PLASTICITY AND TOUGHNESS OF Ti-24Al-11Nb ALLOY. Acta Metall Sin, 1993, 29(1): 43-48.
Abstract Room temperature plastic properties and notch fracture toughness ofTi-Al-Nb alloy with two microstructures, i. e., basketweave α_2+β and equiaxed α_2 distributed inbasketweave α_2+β respectively, were studied by means of three-point bending test. The plas-tic properties, such as fracture deflection f_(max), fracture strain ε_f and strain energy U, were de-rived from load vs cross-head displacement curves, which were measured by smooth speci-mens of 20×5×2.5 (mm), and notch fracture toughness K_c~R were decided by the same sizesamples, with the notch of 2.5 mm depth and 0.05 mm radius. The experimental resultsshowed that the notched samples of Ti-24Al-11Nb alloys fractured in brittle behaviour inspite of 8.8% fracture strain and the alloy with microstructures basketweave α_2+β has agreater fracture toughness than that with equiaxed α_2 distributed in basketweave α_2+β atthe same ductility level. The influence of the length and radius of notch on fracture toughnessis discussed also.
