(1. CNMC Ningxia New Materials Co., Ltd., Shizuishan 753000, China) (2. State Key Laboratory of Special Rare Metal Materials, Northwest Rare Metal Materials Research Institute Ningxia Co., Ltd., Shizuishan 753000, China) (3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China)
In order to study the effect of solution holding time on the microstructure and properties of QBe2 beryllium bronze alloy, QBe2 beryllium bronze alloy was conducted by solution treatment under 790 ℃ for 30, 60, 90 and 120 min, then quenched with the flowing clean water in order to make the beryllium as rich phase fully dissolve in the matrix to obtain the supersaturated solid solution which can produce precipitation strengthening. The effects of different solution holding time on mechanical properties, electrical properties and microstructure of the alloy were also analyzed. The results show that the second phase can be completely dissolved into the matrix when the solution holding time is 60 min. When the solution holding time is 90 min, the mechanical properties of the alloy fully meet the requirements of the industrial products. When the solution holding time reaches 120 min, the plasticity of the alloy is the best. Besides, it also can be found that the yield strength and average grain size of the material after the different solution holding time are in accordance with the Hall-Petch relation.