Li Peiyue, Zhang Xinqi, Liu Xingyu, Li Zhiqiang, Sun Zhihua, Hao Jian, Pan Jinping, Li Zhi, Wang Zhihua
Luoyang Ship Material Research Institute, Luoyang 471000, China.
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2025 Aug 15;18(16):3825. doi: 10.3390/ma18163825.
This article investigates the precipitation behavior of the phases in metastable β-type titanium alloys (Ti-38644) and their significant impact on the mechanical properties. By manipulating various solid solution aging parameters, the morphology, quantity, and distribution of the αs phase can be optimized. After one hour of solid solution treatment at 760 °C, the alloy is predominantly composed of the β phase, with a higher concentration of aluminum at the grain boundaries compared to the interior of the grains. Subsequently, after ten hours of aging treatment at 450 °C and 470 °C, the needle-shaped αs phase preferentially precipitated at the grain boundaries. As the aging temperature increased to 470 °C, the area percentage of the αs phase rose from 42.36% to 57.34%, while its yield strength (σs) increased from 967 MPa at 450 °C to 1211 MPa at 470 °C. This increase in σs results from the combined effects of dislocation strengthening (σρ) and precipitation hardening. This article provides a comprehensive theoretical analysis of the various factors that influence σs, offering valuable theoretical support for the development of heat treatment processes for the Ti-38644 titanium alloy.
本文研究了亚稳β型钛合金（Ti-38644）中相的析出行为及其对力学性能的显著影响。通过控制各种固溶时效参数，可以优化αs相的形态、数量和分布。在760℃进行1小时固溶处理后，合金主要由β相组成，晶界处的铝浓度高于晶粒内部。随后，在450℃和470℃进行10小时时效处理后，针状αs相优先在晶界析出。当时效温度升至470℃时，αs相的面积百分比从42.36%升至57.34%，其屈服强度（σs）从450℃时的967MPa增至470℃时的1211MPa。σs的这种增加是位错强化（σρ）和析出强化共同作用的结果。本文对影响σs的各种因素进行了全面的理论分析，为Ti-38644钛合金热处理工艺的开发提供了有价值的理论支持。
