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IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-10-10 DOI:10.1007/s12540-024-01806-6

Zhi-wei Lian, She-wei Xin, Ping Guo, Huan Wang, Fei Qiang, Xing-yang Tu, Hong-lin Fang

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引用次数: 0

摘要

通过相检测、显微组织观察、拉伸力学性能测试和应力腐蚀断裂韧性测试，分析了铬和铁元素对钛合金应力腐蚀断裂韧性的协同效应。TC4-Cr-Fe钛合金和TC4钛合金由α相和β相组成，未检测到其他相。显微组织表征结果表明，由于铬和铁元素的加入，初级α相（αp）和次级α相（αs）得到显著细化，并促进了αs的形成。添加铬和铁元素可提高抗拉强度和应力腐蚀断裂韧性。铬和铁元素对应力腐蚀断裂韧性的协同作用在于：一方面，可以促进小角度晶界的形成，从而降低扩散速率，抑制晶间腐蚀。另一方面，TC4-Cr-Fe 钛合金在不同方向上存在大量的 αs 聚集区，同时在金字塔滑移体系中，schmid 因子≤ 0.3 的比例较高。因此，当裂纹通过时，会频繁地改变方向，对裂纹的扩展过程有明显的延缓和偏转作用。而当裂纹穿透低施密特因子的晶粒时，大量滑移体系难以启动，导致应力集中和位错密度增加。位错密度的增加可有效削弱微裂纹扩展的驱动能量，增加其持续扩展所需的能量，从而阻碍裂纹的扩展过程。

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Synergistic Effect of Cr and Fe Elements on Stress Corrosion Fracture Toughness of Titanium Alloy

Synergistic effect of Cr and Fe elements on stress corrosion fracture toughness of titanium alloy was analyzed by phase detection, observation of the microstructure, tensile mechanical properties test and stress corrosion fracture toughness test. TC4-Cr-Fe titanium alloy and TC4 titanium alloy were composed of α phase and β phase, and no other phases were detected. The microstructure characterization showed that the primary alpha phase (α_p) and secondary alpha phase (α_s) can be significantly refined due to the addition of Cr and Fe elements, and the formation of α_s can be promoted. The tensile strength and stress corrosion fracture toughness can be improved by adding Cr and Fe elements. The synergistic effect of Cr and Fe elements on stress corrosion fracture toughness was that on the one hand, the formation of small angle grain boundaries can be promoted, which had a low diffusion rate and inhibited intergranular corrosion. On the other hand, TC4-Cr-Fe titanium alloy had a large number of α_s aggregation regions in different directions, and at the same time, it had a higher proportion of schmid factor ≤ 0.3 in pyramidal slip system. Therefore, when the crack passes through, it will be frequently changed in direction, which has obvious retardation and deflection effect on the crack extension process. And when the grains with low schmid factor were penetrated by cracks, a large number of slip systems were difficult to start, resulting in stress concentration and dislocation density increase. The increase of dislocation density can effectively weaken the driving energy of micro-crack extension and increase the energy needed for its continuous extension, thus the crack extension process was hindered.

Graphical Abstract

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.