Optimal Design of High-Strength Ti‒Al‒V‒Zr Alloys through a Combinatorial Approach.
Optimal Design of High-Strength Ti‒Al‒V‒Zr Alloys through a Combinatorial Approach.
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通过组合方法优化设计高强度 Ti-Al-V-Zr 合金
DOI：
10.3390/ma11091603
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发表时间：
2018-09-04
期刊：
影响因子：
--
通讯作者：
Liu L
中科院分区：
文献类型：
--
作者：
Wu D;Tian Y;Zhang L;Wang Z;Sheng J;Wang W;Zhou K;Liu L
采用组合方法研究了不同Zr含量（0 ~ 45 wt.%）对Ti6Al4V合金显微组织和力学性能的影响。制备Ti6Al4V-Ti6Al4V20Fe-Ti6Al4V20Cr-Ti6Al4V20Mo-Ti6Al4V45Zr扩散倍数，并进行扩散退火，获得较大的成分空间。结合扫描电镜、电子探针显微分析和显微硬度系统，确定了这些合金的成分、显微组织和硬度之间的关系。Ti-6Al-4V-30Zr合金的α板条最薄，硬度最高。x射线衍射和透射电镜结果表明，β-场淬火后，形成亚稳α″-相；在二次时效阶段，亚稳α″-相作为稳定α-相的前体成核位点。制备了块状Ti6Al4V30Zr合金。经550℃时效处理后，合金的强度和塑性平衡良好，抗拉强度为1464 MPa，伸长率为8.3%。随着时效温度的升高，合金的抗拉强度和屈服强度升高，但总伸长率下降。α-相的片层厚度和体积分数是影响材料力学性能的主要因素。
The influence of various Zr contents (0–45 wt.%) on the microstructure and mechanical properties of Ti6Al4V alloy was investigated through a combinatorial approach. The diffusion multiples of Ti6Al4V–Ti6Al4V20Fe–Ti6Al4V20Cr–Ti6Al4V20Mo–Ti6Al4V45Zr were manufactured and diffusion-annealed to obtain a large composition space. Scanning electron microscopy, electron probe micro-analysis, and a microhardness system were combined to determine the relationships among the composition, microstructure, and hardness of these alloys. The Ti–6Al–4V–30Zr alloy was found to contain the thinnest α lath and showed peak hardness. X-ray diffraction and transmission electron microscope results indicated that after quenching from the β-field, the metastable α″-phase formed; moreover, at the secondary aging stage, the metastable α″-phase acted as precursor nucleation sites for the stable α-phase. The bulk Ti6Al4V30Zr alloy was manufactured. After aging at 550 °C, the alloy showed excellent balance of strength and ductility, and the tensile strength was 1464 MPa with a moderate elongation (8.3%). As the aging temperature increased, the tensile strength and yield strength of the alloys rose, but the total elongation decreased. The lamella thickness and volume fraction of the α-phase were the major factors that had great impacts on the mechanical properties.
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发表时间：
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期刊：
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