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首页> 外文期刊>Materials Science and Engineering >Microstructural evolution and age hardening behavior of a new metastable beta Ti-2Al-9.2Mo-2Fe alloy
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Microstructural evolution and age hardening behavior of a new metastable beta Ti-2Al-9.2Mo-2Fe alloy

机译：新型亚稳态βTi-2Al-9.2Mo-2Fe合金的组织演变和时效行为

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A study on microstructural evolution and age hardening behavior of a new metastable beta titanium alloy Ti-2Al-9.2Mo-2Fe was undertaken by microscopic observation, Vickers hardness and tensile tests in this research. The result showed that the athermal ω phase was formed in the beta matrix after solution treatment and followed by water quench, but it seemed that the athermal ω phase did not result in a considerable hardening (300 HV in hardness and 670 MPa in YS in ST condition). However, the isothermal ω phases with 10-40 nm and nano-scaled α platelets with 30-100 nm were observed in the alloy aged at lower temperatures (300-450 ℃). The nano-scaled ω and α phase led to an attractive hardening effect (400-500 HV in hardness and above 1500 MPa in YS). However, micro-scaled α phase with 0.5～3 μm obtained in the samples aged at temperatures (500-600 ℃) showed a moderate hardening (350-450 HV in hardness and 1100-1500 MPa in YS). The hardening went through an under-aging, peak-aging and over-aging due to the continuation of nucleation and growth of the a phases and subsequent coarsening. The coarsen α phases (3-5 μm) and grain boundary α layers (0.1-0.5 μm in thickness) obtained at high temperatures aging (650-750 ℃) showed a poor hardening or even a softening (around 300 HV in hardness and below 1000 MPa in YS). The Ti-2Al-9.2Mo-2Fe alloy had a fast aging response, and can be age hardened to high hardness above 400 HV within 30 min at a broad aging temperature region. The age hardening curves can also provide a basic criterion for selecting aging treatment for a given stress level.
机译：通过显微镜观察，维氏硬度和拉伸试验研究了新型亚稳β钛合金Ti-2Al-9.2Mo-2Fe的组织演变和时效行为。结果表明，固溶处理后，β基体中形成无热的ω相，然后进行水淬，但似乎无热的ω相不会导致相当大的硬化（ST中YS的硬度为300HV，YS为670 MPa）。健康）状况）。然而，在较低温度（300-450℃）下时效的合金中观察到了10-40 nm的等温ω相和30-100 nm的纳米级α片晶。纳米级的ω和α相导致了有吸引力的硬化效果（硬度为400-500 HV，YS为1500 MPa以上）。然而，在温度（500-600℃）下老化的样品中获得的0.5〜3μm的微尺度α相表现出中等程度的硬化（硬度为350-450 HV，YS为1100-1500 MPa）。由于α相的成核和生长的持续以及随后的粗化，硬化经历了时效不足，峰时效和过时效。在高温时效（650-750℃）下获得的粗化α相（3-5μm）和晶界α层（厚度0.1-0.5μm）显示出较差的硬化甚至软化（硬度约为300 HV及以下）在YS中为1000 MPa）。 Ti-2Al-9.2Mo-2Fe合金具有快速的时效响应，可以在较宽的时效温度范围内在30分钟内时效硬化至400 HV以上的高硬度。时效硬化曲线还可以为在给定应力水平下选择时效处理提供基本标准。

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