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不同尺寸的α相对亚稳β钛合金Ti-5.5Cr-5Al-4Mo-3Nb-2Zr拉伸性能的影响
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1.沈阳工业大学材料科学与工程学院;2.西北有色金属研究所

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National Natural Science Foundation of China (52104379), (U21A20117), (52071219), (52271249)


Effect of different sizes of α phase on tensile properties of metastable titanium alloy Ti-5.5Cr-5Al-4Mo-3Nb-2Zr
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National Natural Science Foundation of China (52104379), (U21A20117), (52071219), (52271249)

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    摘要:

    为了研究新型亚稳β钛合金Ti-5.5Cr-5Al-4Mo-3Nb-2Zr的微观组织与拉伸性能之间的关系,本实验设计了一种可以在β基体中析出不同尺寸的α相的ABFCA热处理工艺(在α+β相区进行固溶处理然后随炉冷却最后进行时效处理)。这种热处理工艺获得的微观组织是由初生α相(αp)、亚微米级棒状α相(αr)和次生α相(αs)组成。结果表明,具有多尺寸的α相的合金具有较高的强度和极好的塑性。当合金的极限抗拉强度(UTS)为1125.4 MPa时,合金的断后伸长率(EL)可以达到18.3%。本实验建立了合金强度与α相之间的关系,合金的强度与α相的宽度以及平均间距的-1/2次幂成线性关系,尺寸和相间距较小的αs相通过对位错滑移的阻碍作用使合金的强度大大提高。通过透射电子显微镜观察表明,在α/β界面上存在大量的位错塞积,而且在拉伸变形之后的αp相内发现了大量的变形孪晶。当位错滑移受到阻碍时,在应力集中处萌发孪晶,而孪晶又可以启动一些难以滑移的位错,同时塑性应变在αp、αr、αs相和β基体中均匀分布,使得合金的塑性有较大提升。本实验提出的ABFCA热处理工艺为亚稳β钛合金的热处理提供了参考,本研究为钛合金的发展做出了一定的贡献。

    Abstract:

    To study the relationship between the microstructure and tensile properties of the novel metastable β titanium alloy Ti-5.5Cr-5Al-4Mo-3Nb-2Zr, a heat treatment process of ABFCA (α+β annealed with subsequent furnace cooling plus aging treatment) was designed, which can precipitate α phases of different sizes in the β matrix. The microstructure obtained by this heat treatment process is composed of a primary α (αp) phase, submicro rod-like α (αr) phase and secondary α (αs) phase. The results show that the alloy with multiscale α phase has an excellent balance of strength-ductility. The elongation (EL) is ~18.3% at the ultimate tensile strength (UTS) of ~1125.4 MPa. In this experiment, the relationship between the strength of the alloy and the α phase is established. The strength of the alloy is proportional to the power of -1/2 of the α phase average spacing and width. The αs phase with a smaller size and phase spacing can greatly improve the strength of the alloy by hindering dislocation slip. The transmission electron microscopy analysis shows that there is a large amount of dislocation accumulation on the α/β interfaces, and many deformation twins were found in the αp phase after tensile deformation. When the dislocation slip is hindered, twins occur at the stress concentration, and twins can initiate some dislocations that are difficult to slip. Meanwhile, the plastic strain is distributed compatibly among the αp, αr, αs phase and β matrix, thereby enhancing the ductility of the alloy. The ABFCA heat treatment process proposed in this study provides a reference for the heat treatment of metastable β titanium alloys, and this study has made a modest contribution to the development of titanium alloys.

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劳振宏,张浩宇,王圣元,程军,谭兵,周舸,张思倩,陈立佳.不同尺寸的α相对亚稳β钛合金Ti-5.5Cr-5Al-4Mo-3Nb-2Zr拉伸性能的影响[J].稀有金属材料与工程,,().[Lao Zhenhong, Zhang Haoyu, Wang Shengyuan, Cheng Jun, Tan Bing, Zhou Ge, Zhang Siqian, Chen Lijia. Effect of different sizes of α phase on tensile properties of metastable titanium alloy Ti-5.5Cr-5Al-4Mo-3Nb-2Zr[J]. Rare Metal Materials and Engineering,,().]
DOI:10.12442/j. issn.1002-185X.20230791

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  • 收稿日期:2023-12-06
  • 最后修改日期:2024-01-05
  • 录用日期:2024-01-05
  • 在线发布日期: 2024-03-22
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