关键词: 非晶复合材料, 热变形行为, 热加工图

Abstract: High-temperature uniaxial compression tests were conducted on the Ti_34.88Zr_30.73Cu_8.34Co_4.46Be_21.60 alloy by using Gleeble-3500 thermal simulation machine, under conditions of deformation temperatures ranging from 613 K to 633 K, strain rates from 5×10^-4s^-1 to 1×10^-2s^-1 and total strain of 50%, the hot deformation behavior was studied, and the hot processing diagram was drawn. The results show that brittle fracture occurs at different deformation temperatures and strain rate of 1×10^-2 s^-1. At the strain rate of 5×10^-3 s^-1 and 1×10^-3 s^-1, when the deformation temperature is 613 K, the stress increases sharply with the increase of strain, and then gradually decreases after reaching the peak value; when the deformation temperature is 623 K, the stress rises slowly and tends to be stable; when the deformation temperature is 633 K, work hardening occurs. Under the strain rate of 5×10^-4 s^-1, the work hardening phenomenon is exhibited at different deformation temperatures. In the two deformation regions of deformation temperature of 613-623 K, strain rate of 5×10^-4 s^-1, and deformation temperature of 633 K, strain rate of 1×10^-3 s^-1, the energy dissipation coefficients η_p of the alloy are more than 0.9, which are suitable for superplastic deformation. Combined with the observation of microstructure, the alloy exhibits the optimal hot processing performance under the conditions of deformation temperature of 633 K and strain rate of 1×10^-3 s^-1.

Key words: amorphous composites, hot deformation behavior, hot processing map