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Guoliang CHEN , Yandong WANG , Yuanding HUANG , Zuqing SUNand Wangyue YANG(State Key Lab. for Adv. Met , Mater. , University of Science and Technology Beijing , Beijing , Beijing , 100083 , China)(To whom correspondence should be addressed)
材料科学技术（英文）
The mechanical behaviours of Ti-24Al-11Nb alloy in the brittle-ductile transition (BOT) have been investigated by using three-point bending tests. The temperature dependence of the fractal dimensions and fractal characterization of fracture surfaces are presented. The probable mechanism controlling BDT of intermetallic alloys are proposed according to fractal geometry.Additionally. it is found that there is a positive relationship between the fractal dimension and fracture toughness in BDT for Ti-24Al-11Nb alloy
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