Optimization of Low-Cost Ti-35421 Titanium Alloy: Phase Transformation, Bimodal Microstructure, and Combinatorial Mechanical Properties
Optimization of Low-Cost Ti-35421 Titanium Alloy: Phase Transformation, Bimodal Microstructure, and Combinatorial Mechanical Properties
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低成本 Ti-35421 钛合金的优化：相变、双峰微观结构和组合力学性能
DOI：
10.3390/ma12172791
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发表时间：
2019-08
期刊：
影响因子：
3.4
通讯作者：
Chang Hui
中科院分区：
文献类型：
--
作者：
Chen Fuwen;Xu Guanglong;Cui Yuwen;Chang Hui
对于新开发的低成本Ti-35421 （Ti-3Al-5Mo-4Cr-2Zr-1Fe wt.%）钛合金的力学性能优化而言，深入了解相变和微观组织演化是至关重要的。通过实验和热力学模型研究了双相Ti-35421的相变。相变反应和温度范围分别为β→α片层[410 ~ 660℃]、α片层→β[660 ~ 740℃]、α片层→β[740 ~ 825℃]。Gibbs-Thomson效应和多组分扩散系数被证明是区分两个α相生长和溶解行为的主要原因。在此基础上，优化了540℃的时效温度。引入了由粗短α片层和β基体组成的双峰组织。对双峰Ti-35421的力学性能进行了测试，并与基准合金Ti-B19和其他近β钛合金进行了比较。经540℃时效处理后，合金的抗拉强度为1313 MPa，屈服强度为1240 MPa，伸长率为8.62%，断裂韧性为75.8 MPa·m1/2。双峰Ti-35421具有与Ti-B19相当的性能，但原材料和加工成本更低。结果还表明，热动力学建模可以有效地用于定制微观组织和提高力学性能。
A sophisticated understanding of phase transformations and microstructure evolution is crucial in mechanical property optimization for the newly developed low-cost Ti-35421 (Ti-3Al-5Mo-4Cr-2Zr-1Fe wt.%) titanium alloy. The phase transformations in dual-phase Ti-35421 were studied by experiments and thermo-kinetic modeling. The phase transformation reactions and temperature ranges were determined as β→αlamellar [410–660 °C], αlamellar→β [660–740 °C], αlath→β [740–825 °C]. The Gibbs-Thomson effect and multicomponent diffusivities were proven to be responsible for the distinguishing behaviors of growth and dissolution between two α phases. The aging temperature of 540 °C was optimized based on calculations. It introduced a bimodal microstructure containing stubby α lamellae and β matrix. The mechanical properties of bimodal Ti-35421 were tested and compared with baseline alloy Ti-B19 and other near-β titanium alloys. The 540 °C aged alloy exhibits an optimal combination of mechanical properties with tensile strength of 1313 MPa, yield strength of 1240 MPa, elongation of 8.62%, and fracture toughness of 75.8 MPa·m1/2. The bimodal Ti-35421 shows comparable performance to Ti-B19 but has lower cost in raw materials and processing. The results also demonstrate that thermo-kinetic modeling can effectively be utilized in tailoring microstructure and enhancing mechanical properties.
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影响因子：
2.8
作者：
R. Zannetti
通讯作者：
R. Zannetti
影响因子：
6
作者：
Chen, Q;Ma, N;Wang, YZ
通讯作者：
Wang, YZ
DOI：
--
发表时间：
2010
期刊：
--
影响因子：
--
作者：
B. Welk
通讯作者：
B. Welk
影响因子：
3.2
作者：
R. Trivedi;G. M. Pound
通讯作者：
R. Trivedi;G. M. Pound
影响因子：
8.4
作者：
Shekhar, Shashi;Sarkar, Rajdeep;Bhattacharjee, Amit
通讯作者：
Bhattacharjee, Amit