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首页> 外文期刊>Materials Science and Engineering >Effect of phase transformations during aging on tensile strength and ductility of metastable beta titanium alloy Ti-35Nb-7Zr-5Ta-0.35O for orthopedic applications
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Effect of phase transformations during aging on tensile strength and ductility of metastable beta titanium alloy Ti-35Nb-7Zr-5Ta-0.35O for orthopedic applications

机译：时效相变对整形外科应用亚稳态β钛合金Ti-35Nb-7Zr-5Ta-0.35O的拉伸强度和延展性的影响

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摘要

Present work describes the aging response of biocompatible metastable beta titanium alloy Ti-35Nb-7Zr-5Ta (TNZT alloy for short) solution treated (ST) in (a + ss) phase field. The primary focus of this study is to gain insight into the correlation among phase transformations, microstructure and mechanical properties of TNZT alloy pertinent for orthopedic applications. Complete recrystallization is observed during heat treatment at 750 ℃-8 h and these ST samples were subsequently aged from 300 ℃ to 550 ℃ for times up to 64 h. Very low elastic moduli in the range of 41-46 GPa are observed which is explained in terms of calculated values of alloying parameters bond order, d orbital energy value and electron per atom ratio. Lower aging temperatures have improved ductility (greater than 13% elongation), whereas higher temperature aged samples are failed in brittle manner (elongation < 5%). Among the aging treatments, 350 ℃-16 h aging has resulted in an optimum strength and ductility combination of 966 MPa and 13.7%, respectively. Transmission electron microscopy analysis has confirmed the vital role of omega phase precipitation during 350 ℃-16 h aging contributing to enhanced tensile and yield strength. Moreover, this investigation also indicates that the reduced ductility observed in case of 500 ℃-8 h aging can be attributed to the coarsened lenticular grain boundary a precipitation and intragranular coarser alpha laths. Hence from the mechanical aspects of the current investigation, 350 ℃-16 h aging can be considered to be a suitable heat treatment parameter for orthopedic applications.
机译：目前的工作描述了在（a + ss）相场中生物相容的亚稳态β钛合金Ti-35Nb-7Zr-5Ta（简称TNZT合金）固溶处理（ST）的时效响应。这项研究的主要重点是深入了解与骨科应用相关的TNZT合金的相变，微观结构和力学性能之间的相关性。在750℃-8 h的热处理过程中观察到完全重结晶，随后将这些ST样品从300℃老化到550℃，时间长达64 h。观察到极低的弹性模量在41-46 GPa的范围内，这是根据合金参数键序，d轨道能量值和电子/原子比的计算值来解释的。较低的时效温度具有改善的延展性（大于13％的伸长率），而较高温度的时效样品则以脆性方式破坏（伸长率<5％）。在时效处理中，350℃-16 h时效可使最佳强度和延性组合分别达到966 MPa和13.7％。透射电子显微镜分析已证实，在350℃-16 h时效过程中，ω相析出起着至关重要的作用，有助于增强拉伸强度和屈服强度。此外，该研究还表明，在500℃-8 h时效下观察到的延展性降低可归因于双凸晶界的粗化，沉淀和晶内较粗的α板条。因此，从当前研究的机械方面来看，350℃-16 h的时效可以被认为是骨科应用的合适热处理参数。

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