Effects of annealing temperature and cooling medium on the microstructure and mechanical properties of a novel dual phase high entropy alloy
Effects of annealing temperature and cooling medium on the microstructure and mechanical properties of a novel dual phase high entropy alloy
复制标题
退火温度和冷却介质对新型双相高熵合金显微组织和力学性能的影响
DOI：
10.1016/j.matchar.2020.110291
复制
发表时间：
2020
影响因子：
4.7
通讯作者：
Yin Fuxing
中科院分区：
文献类型：
--
作者：
Yu Haoyang;Fang Wei;Chang Ruobin;Bai Xi;Zhang Xin;Liu Baoxi;Jiang Yanfei;Yin Fuxing
研究了退火温度和冷却介质对新型Co35Cr25Fe37.5Ni2.5合金的六方密排(HCP)相分数和力学性能的影响。通过相同的退火温度和不同的冷却介质，获得了均匀的初始晶粒尺寸和不同的HCP相分数。当冷却介质为液氮替代水时，HCP相面积分数增加了一倍，主要原因是液氮冷却成核位点迅速增加。具有不同方向的 HCP 层压板在晶粒内交叉。 Co35Cr25Fe37.5Ni2.5 合金在 900 °C 液氮淬火退火时的屈服强度和极限拉伸强度分别约为 482 MPa 和 1079 MPa。讨论了 FCC 相和 HCP 相对屈服强度的贡献。结果表明，退火温度和冷却介质的组合是调节双相高熵合金HCP相分数和力学性能的有效控制方法。
Effects of annealing temperature and cooling medium on the hexagonal close-packed (HCP) phase fraction and mechanical properties of a novel Co35Cr25Fe37.5Ni2.5alloy are investigated. The uniformly initial grain size and different HCP phase fractions are obtained via the same annealing temperature and different cooling mediums. The HCP phase area fraction is doubled as the cooling medium of water is replaced by liquid nitrogen, and the main reason is the rapid increase of nucleation sites of liquid nitrogen cooling. HCP laminates with different orientations intersect within grains. The yield strength and ultimate tensile strength of Co35Cr25Fe37.5Ni2.5alloys annealing at 900 °C with liquid nitrogen quenching are ~482 MPa and ~1079 MPa, respectively. Contributions of the FCC phase and HCP phase to yield strength are discussed. The results indicate the combination of annealing temperature and cooling medium is an efficient manipulation method to adjust the HCP phase fraction and mechanical properties of dual phase high entropy alloy.