Wang Zheng, Li Jiang, Zhang Yi, Lv Chuanming, Li Ting, Zhang Jiaqi, Hui Songxiao, Peng Lijun, Huang Guojie, Xie Haofeng, Mi Xujun
State Key Laboratory of Nonferrous Metals and Processes, GRIMAT Group Co., Ltd., Beijing 100088, China.
China Academy of Space Technology, Beijing 100094, China.
Materials (Basel). 2022 Mar 31;15(7):2570. doi: 10.3390/ma15072570.
As it is known, beryllium bronze, an important copper alloy, is widely used in the field of aerospace. Since the performance of domestic and imported beryllium bronze alloys have obvious differences, domestic beryllium bronze QBe2.0 and imported C17200 alloy were adopted, and the hardness and tensile properties of imported and domestic beryllium bronze alloys in the peak aging state were compared and analyzed. In addition, the microstructure morphologies of the C17200 alloy and QBe2.0 alloy were analyzed by SEM, EBSD, and TEM. This study adopted a data-driven exploration approach to elaborate the differences between C17200 and QBe2.0 alloy. After aging at 300 °C for 2 h (peak aging), the tensile strengths of the C17200 alloy and QBe2.0 alloy were 1357 MPa and 1309 MPa, the yield strengths were 1195 MPa and 1188 MPa, and the elongations were 5.5% and 4.0%, respectively. In the peak-aged state, the grain size, uniformity, small angle grain boundary, and twin density of the C17200 alloy were much better than those of the QBe2.0 alloy, which led to more significant grain refinement and twin strengthening effects. A large amount of γ' phase, γ phase, and β phase were precipitated in both alloys, but the precipitation density of the γ' strengthening phase in the C17200 alloy was much greater than that of the QBe2.0 alloy. The C17200 alloy exhibited better mechanical properties under the combined effects of the various strengthening mechanisms, which provided a guideline for the subsequent improvement of domestic alloys and laid a solid foundation for the development of new copper alloys.
众所周知，铍青铜作为一种重要的铜合金，在航空航天领域有着广泛的应用。由于国产和进口铍青铜合金的性能存在明显差异，因此采用了国产铍青铜QBe2.0和进口C17200合金，对进口和国产铍青铜合金在峰值时效状态下的硬度和拉伸性能进行了比较和分析。此外，通过扫描电子显微镜（SEM）、电子背散射衍射（EBSD）和透射电子显微镜（TEM）对C17200合金和QBe2.0合金的微观组织形态进行了分析。本研究采用数据驱动的探索方法，阐述了C17200合金和QBe2.0合金之间的差异。在300℃时效2小时（峰值时效）后，C17200合金和QBe2.0合金的抗拉强度分别为1357MPa和1309MPa，屈服强度分别为1195MPa和1188MPa，伸长率分别为5.5%和4.0%。在峰值时效状态下，C17200合金的晶粒尺寸、均匀性、小角度晶界和孪晶密度均优于QBe2.0合金，这导致了更显著的晶粒细化和孪晶强化效果。两种合金中均析出了大量的γ'相、γ相和β相，但C17200合金中γ'强化相的析出密度远大于QBe2.0合金。C17200合金在各种强化机制的综合作用下表现出更好的力学性能，为国产合金的后续改进提供了指导，为新型铜合金的开发奠定了坚实的基础。
