Effects of oxygen and heat treatment on the mechanical properties of alpha and beta titanium alloys

Liu, Z.; Welsch, G.

doi:10.1007/bf02649267

Cited by 178 publications

(63 citation statements)

References 23 publications

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“…It is generally accepted that interstitial oxygen, like nitrogen and carbon elements, can significantly harden titanium alloys and accounts for the increase in strength and decrease in ductility in this class of materials. [22,25,26] This effect is achieved through different mechanisms that have been discussed earlier. In ␤ alloys, hardening mechanisms are solid-solution hardening by interstitial oxygen, precipitation, or microstructure alteration, such as grain-size refinement.…”

Section: A Ductility Exhaustion Mechanisms At Temperatures ͼ545 °Cmentioning

confidence: 97%

Ductility exhaustion mechanisms in thermally exposed thin sheets of a near-β titanium alloy

Sansoz

Almesallmy

Ghonem

2004

Metall Mater Trans A

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This study examines the effects of thermal exposure in air environment on the plastic elongation of thin sheets of Ti-15Mo-2.7Nb-3Al-0.2Si (Timetal-21S) alloy. Specimens with thicknesses of 0.12, 0.39, and 1.0 mm were exposed in air environment to temperatures ranging from 482 °C to 693 °C. Tensile tests conducted on these specimens at room temperature show a reduction of plastic elongation proportional to the thermal exposure parameters, time and temperature. Furthermore, a change in the failure mode into a quasi-brittle fracture was observed in the near-surface region. The depth of this region depends on both exposure time and temperature. The kinetics of embrittlement is studied through theoretical considerations of gas diffusion into metal. This approach shows that two distinct embrittlement mechanisms operate in this alloy. The characteristics of each of these mechanisms depend on the corresponding temperature range. At temperatures higher than 545 °C, the embrittlement activation energy is 41.2 kcal и mol Ϫ1 , indicating that the embrittlement process is governed by an enhanced diffusion of oxygen into Timetal-21S. Below this transitional temperature, the embrittlement activation energy approaches zero, a characteristic of slow kinetics transformation. The effects of solid-solution hardening, precipitation-hardening mechanisms, and alloying-element partitioning on ductility exhaustion processes are analyzed and discussed.

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Section: A Ductility Exhaustion Mechanisms At Temperatures ͼ545 °Cmentioning

confidence: 97%

Ductility exhaustion mechanisms in thermally exposed thin sheets of a near-β titanium alloy

Sansoz

Almesallmy

Ghonem

2004

Metall Mater Trans A

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“…It is well known that oxygen content significantly increases the yield strength of titanium alloys owing to the formation of coherent α 2 particles [5,62]. Razorenov et al [63] have studied the shock behaviour of three Ti-6Al-4V alloys of different oxygen contents and measured a marked increase in the HEL with increasing oxygen content; the spall strength appeared largely unaffected by increasing the oxygen content from 0.105% up to 0.24%.…”

Section: (A) Shock Response Of Titaniummentioning

confidence: 99%

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

Hazell

Appleby-Thomas

Wielewski

et al. 2014

Phil. Trans. R. Soc. A.

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Magnesium, titanium and zirconium and their alloys are extensively used in industrial and military applications where they would be subjected to extreme environments of high stress and strain-rate loading. Their hexagonal close-packed (HCP) crystal lattice structures present interesting challenges for optimizing their mechanical response under such loading conditions. In this paper, we review how these materials respond to shock loading via plate-impact experiments. We also discuss the relationship between a heterogeneous and anisotropic microstructure, typical of HCP materials, and the directional dependency of the elastic limit and, in some cases, the strength prior to failure.

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“…Oxygen is a strong solution strengthener for titanium material, but an excess will compromise ductility and fracture toughness. [5][6][7][8] To meet the oxygen requirement of industrial standards for final manufactured components, which is less than 0.2 wt.%, 9-11 most applications require the oxygen content in Ti powder to be less than 0.15 wt.%.…”

Section: Introductionmentioning

confidence: 99%

Review of the Methods for Production of Spherical Ti and Ti Alloy Powder

Sun

Fang

Zhang

et al. 2017

JOM

191

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Spherical titanium alloy powder is an important raw material for near-netshape fabrication via a powder metallurgy (PM) manufacturing route, as well as feedstock for powder injection molding, and additive manufacturing (AM). Nevertheless, the cost of Ti powder including spherical Ti alloy has been a major hurdle that prevented PM Ti from being adopted for a wide range of applications. Especially with the increasing importance of powder-bed based AM technologies, the demand for spherical Ti powder has brought renewed attention on properties and cost, as well as on powder-producing processes. The performance of Ti components manufactured from powder has a strong dependence on the quality of powder, and it is therefore crucial to understand the properties and production methods of powder. This article aims to provide a cursory review of the basic techniques of commercial and emerging methods for making spherical Ti powder. The advantages as well as limitations of different methods are discussed.

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Effects of oxygen and heat treatment on the mechanical properties of alpha and beta titanium alloys

Cited by 178 publications

References 23 publications

Ductility exhaustion mechanisms in thermally exposed thin sheets of a near-β titanium alloy

Ductility exhaustion mechanisms in thermally exposed thin sheets of a near-β titanium alloy

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

Review of the Methods for Production of Spherical Ti and Ti Alloy Powder

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