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High-strength β stabilized Ti-Nb-Fe-Cr alloys with large plasticity

机译:具有高塑性的高强度β稳定Ti-Nb-Fe-Cr合金

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摘要

A group of Ti-27Nb-7Fe-xCr (x = 0, 2, 4, 6, 8 wt%) alloys were designed on the basis of the DV-Xα cluster method, molybdenum equivalent and valence electron to atom ratio. The designed alloys were produced using the cold crucible levitation melting process for studying their microstructures and mechanical properties. The alloying of Cr renders a dual phase microstructure composed of a dominant β and a small amount of orthorhombic α'' formed in the Ti-27Nb-7Fe alloy to a single β phase microstructure formed in the alloys containing Cr. In the present work, yield strength is influenced by the effects of solid solution strengthening and fine grain strengthening, whereas hardness is influenced by the phases present and the level of the β stability. None of the investigated alloys fail until the load reaches 100 kN and all demonstrate impressive maximum compressive strength (~ 2 GPa) as well as plastic strain (> 26%). Young's modulus decreases from 116 GPa (for Ti-27Nb-7Fe) to 72 GPa (for Ti-27Nb-7Fe-8Cr) as the β stability improves. Moreover, the analyses of slip band patterns around the hardness indentation, wear resistance indices (i.e. H/E and H3/E2) and elastic energies of the Ti-27Nb-7Fe-xCr alloys are carried out in the present work.
机译:基于DV-Xα团簇法,钼当量和价电子原子比,设计了一组Ti-27Nb-7Fe-xCr(x = 0、2、4、6、8 wt%)合金。设计的合金是使用冷坩埚悬浮熔炼工艺生产的,用于研究其微观结构和力学性能。 Cr的合金化使得在Ti-27Nb-7Fe合金中形成的由占主导地位的β和少量斜方晶α''组成的双相微观结构,变成了在含Cr的合金中形成的单一β相微观结构。在目前的工作中,屈服强度受固溶体强化和细晶粒强化的影响,而硬度受存在的相和β稳定性水平的影响。在负载达到100 kN之前,没有一种被研究的合金会失效,并且所有合金都表现出令人印象深刻的最大抗压强度(〜2 GPa)和塑性应变(> 26%)。随着β稳定性的提高,杨氏模量从116 GPa(对于Ti-27Nb-7Fe)降至72 GPa(对于Ti-27Nb-7Fe-8Cr)。此外,在本工作中分析了Ti-27Nb-7Fe-xCr合金的硬度压痕,耐磨指数(即H / E和H3 / E2)和弹性能附近的滑带图案。

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  • 来源
    《Materials Science and Engineering》 |2018年第8期|368-377|共10页
  • 作者单位

    School of Engineering, Edith Cowan University;

    School of Mechanical and Chemical Engineering, The University of Western Australia;

    Department of Materials Engineering, Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University;

    School of Mechanical Engineering, Xi’an University of Science and Technology;

    School of Mechanical Engineering, Xi’an University of Science and Technology;

    School of Mechanical and Chemical Engineering, The University of Western Australia;

    School of Engineering, Edith Cowan University;

    School of Engineering, Edith Cowan University;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium alloy; Microstructure; Mechanical strength; Hardness; Slip band;

    机译:钛合金;显微组织;机械强度;硬度;滑带;

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