The Development of a Ti-6Al-4V Alloy via Oxygen Solid Solution Strengthening for Aerospace &amp; Defense Applications

Jones, Tyrone L.; Kondoh, Katsuyoshi; Mimoto, Takanori; Nakanishi, Nozomi; Umeda, Junko

doi:10.4028/www.scientific.net/kem.551.118

Cited by 19 publications

(6 citation statements)

References 8 publications

(8 reference statements)

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“…ubiquitous alloying elements). 1,2) Titanium alloys exhibit a remarkable improvement in strength even with small additions of oxygen, an interstitial solid solution element in Ti. Although the elongation to failure decreases with increasing the oxygen addition, it has been confirmed that this effect approaches a limit at approximately 0.1 mass% O content.…”

Section: Introductionmentioning

confidence: 99%

Ductility Improvement Mechanism of Ti–6Al–4V+O Sintered Material

Kamiyama¹,

Kariya²,

Fukuo³

et al. 2020

Mater. Trans.

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The previous study indicated powder metallurgy (PM) Ti-64 alloys with oxygen showed the increment of not only their tensile strength but elongation. This study investigated the elongation improvement mechanism of Ti-64 alloys with oxygen atoms. The mix of Ti-64 alloy powder and TiO 2 particles (0³0.4 mass%) was used as starting materials and consolidated by spark plasma sintering (SPS). The following heat treatment in vacuum was applied to sintered materials. ¢ transus temperature increased by oxygen addition because it was one of ¡-phase stabilizer elements. Prior-¢ grains size and aspect ratio of ¡-Ti grains were changed by heat treatment conditions. For example, Ti-64+O alloys after heattreated at ¢-phase temperature range showed acicular ¡-Ti grains with a large aspect ratio (6.1³7.0) although those with heat treatment at ¡+¢phase temperature had ¡-grains with a small aspect ratio of 3.3³4.0. These grain morphology changes strongly depended on the temperature of heat treatment, not oxygen contents. In addition, the latter materials indicated high elongation (16³17%) compared to the former with 9³10%. When Ti-64+O alloy specimens after tensile test were analyzed by SEM-EBSD, Kernel average misorientation (KAM) maps showed many plastic strains induced in small aspect ratio ¡-Ti grains.

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Section: Introductionmentioning

confidence: 99%

Ductility Improvement Mechanism of Ti–6Al–4V+O Sintered Material

Kamiyama¹,

Kariya²,

Fukuo³

et al. 2020

Mater. Trans.

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“…[88] They occupy the octahedral interstices and expand the crystal lattice, particularly along the c-axis, leading to an increased c/a ratio as shown in Figure 11. [101,105,118,[130][131][132][133] Solute N has a larger atomic radius than O and thereby exhibits a faster increase in c/a Figure 10. Failure profile of TiMMCs reflecting the strong reinforcement-matrix bonding: a) in Ti-6Al-4V strengthened with TiB whiskers, and b) in Ti refinforced with multi-layer graphene (MLG).…”

Section: Solid Solution Strengtheningmentioning

confidence: 99%

Recent Advances in the Design and Fabrication of Strong and Ductile (Tensile) Titanium Metal Matrix Composites

et al. 2019

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Titanium metal matrix composites (TiMMCs) offer much improved strength, elastic modulus, and wear resistance at both room and elevated temperatures but often at the expense of tensile ductility, which excludes them from most key engineering applications. Recent advances show that this long-standing strength-ductility dilemma can be controlled to a large extent by adopting novel design concepts based on powder metallurgy (PM). These include: 1) reinforcing the Ti matrix with a three-dimensional (3D) network-like architecture of TiB whiskers or nanowires; 2) the use of nanostructured carbon precursors (nanotubes, fibers, and graphene) to enable in situ formation of TiC reinforcements; and 3) the exploitation of "ductility-detrimental" interstitial elements (O, N, H) for strengthening. On a laboratory scale, the fabricated TiMMCs all exhibit an excellent combination of tensile strength and elongation, comparable to, or even better than, solution-treated and aged (STA) wrought Ti-6Al-4V. The mechanisms behind these novel developments are analyzed. New insights into the design and fabrication of stronger and more ductile (tensile) TiMMCs are offered.

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“…Machinability of Ti-6Al-4V is of immense importance due to its widespread use in many applications especially in biomedical 1 , automotive 2 , shipbuilding 3 , micro-electromechanical systems 4 and defense industry 5 . Machinability of Ti-6Al-4V is rated as challenging 6 , 7 and poor due to very low thermal conductivity, high chemical reactivity and low modulus of elasticity due to which it is considered as difficult-to-cut material and rapid tool wear is experienced during conventional machining methods 8 .…”

Section: Introductionmentioning

confidence: 99%

The potentiality of sinking EDM for micro-impressions on Ti-6Al-4V: keeping the geometrical errors (axial and radial) and other machining measures (tool erosion and work roughness) at minimum

Ahmed

Anwar

Ishfaq

et al. 2019

Sci Rep

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Ti-6Al-4V is a material of high interest in various industrial sectors including biomedical, automotive and aerospace. Conventional means of machining encounter different types of difficulties. Electric discharge machining (EDM) is not a contest of hardness. Circular impressions of micro-depth are produced in Ti-6Al-4V using four different electrode materials including aluminum, brass, graphite and copper, each assigned positive and negative polarity. In order to get precise control over the geometry of micro-impressions dimensional accuracy and tool wear must be controlled. Thus, EDM performance has been evaluated in terms of axial dimensional error (D.E_Axi), radial dimensional error (D.E_Rad), tool length reduction (TLR), and surface roughness (SR). Since the EDM process is stochastic in nature therefore in addition to tool polarity only two factors are considered as variables, i.e. discharge current and pulse-time-ratio (ration of on-time to off-time). The behaviors of each of the four electrode materials are compared together under each of the two polarities and two variables for each of the four response characteristics. The search is carried out to select the most appropriate tool electrode polarity (common for all responses) and a single common electrode capable of minimizing all the four response measures simultaneously. Moreover, microstructures of the machined impressions are discussed. Without any compromise in the minimum values of response measures, no single polarity and a single electrode are found common. However, with a slight compromise over the machining measures negative tool polarity and copper electrode served the purpose of set objectives (minimum of D.E, TLR, and SR). The expanse of compromise is found to be ≤ 50 µm in axial and radial dimensional errors, 0.8 µm in surface roughness and no compromise in tool length reduction if the copper electrode is assigned with negative polarity.

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The Development of a Ti-6Al-4V Alloy via Oxygen Solid Solution Strengthening for Aerospace & Defense Applications

Cited by 19 publications

References 8 publications

Ductility Improvement Mechanism of Ti–6Al–4V+O Sintered Material

Ductility Improvement Mechanism of Ti–6Al–4V+O Sintered Material

Recent Advances in the Design and Fabrication of Strong and Ductile (Tensile) Titanium Metal Matrix Composites

The potentiality of sinking EDM for micro-impressions on Ti-6Al-4V: keeping the geometrical errors (axial and radial) and other machining measures (tool erosion and work roughness) at minimum

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