Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

Hirano, Takahiro; Murakami, Taichi; Narushima, Takayuki; Ouchi, Chiaki

doi:10.2355/isijinternational.47.1042

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…22,23) Rare-earth elements (La (0.01 mass%), Y (0.1 mass%), Er (0.1 mass%) or Ce (0.1 mass%)) were added to the base alloy. The ingots were prepared using an argon (Ar)-arc melting furnace with a non-consumable tungsten (W) electrode.…”

Section: Methodsmentioning

confidence: 99%

β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

2013

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The effect of the addition of small amounts of rare-earth elements such as La (0.01 mass%), Y (0.1 mass%), Er (0.1 mass%) and Ce (0.1 mass%) on the refinement of ¢-grains in an ¡+¢-type Ti4.5Al6Nb2Fe2Mo alloy was investigated in the temperature range 1173 1573 K. The ¢-grain size and the rare-earth-oxide precipitates obtained after heat treatment were evaluated using optical microscopy, scanning electron microscopy, and transmission electron microscopy. Upon heating, alloys exhibited rapid ¢-grain growth above a threshold temperature, and this temperature depended on the added rare-earth elements. The fine precipitates of rare-earth oxides formed in the alloy suppressed the ¢-grain growth through pinning. Dissolution of the precipitates in the ¢-matrix caused rapid ¢-grain growth. Yttrium was found to be the most effective element for the suppression of ¢-grain growth at high temperatures such as 1573 K.

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Section: Methodsmentioning

confidence: 99%

β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

2013

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“…Solution treatment and aging is a common heat treatment to strengthen titanium alloys [7,8]. For titanium alloys with relatively low content of βstable elements, after solution treatment in the β-phase region and quenching, the β phase undergoes β → α ′ displacive martensitic transformation, resulting in disorderly distributed formation of a fully acicular α ′ microstructure [9,10].…”

Section: Introductionmentioning

confidence: 99%

Revealing the Effect of α’ Decomposition on Microstructure Evolution and Mechanical Properties in Ti80 Alloy

Xiao,

Hu,

et al. 2024

Materials

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Three types of solution treatment and aging were designed to reveal the α’ decomposition and its effect on the mechanical properties of near-α Ti-80 alloy, as follows: solution at 970 °C then quenching (ST), ST + aging at 600 °C for 5 h (STA-1), and ST + aging 600 °C for 24 h (STA-2). The results show that the microstructures of the ST samples were mainly composed of equiaxed αp and acicular α’, with a large number of dislocations confirmed by the KAM results. After subsequent aging for 5 h, α’ decomposed into acicular fine αs and nano-β (intergranular β, intragranular β) in the STA-1 specimen, which obstructed dislocation motion during deformation, resulting in the STA-1 specimen exhibiting the most excellent yield strength (1012 MPa) and maintaining sufficient elongation (8.1%) compared with the ST (898 MPa) and STA-2 (871 MPa) samples. By further extending the aging time to 24 h, the size of acicular αs and nano-β gradually increased while the density of dislocations decreased, which resulted in a decrease in strength and an increase in plasticity. Based on this, a microstructures–properties correlation model was proposed. This study provides a new method for strength–plasticity matching of near-α titanium alloys through α’ decomposition to acicular αs+nano-β.

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Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

Cited by 2 publications

References 8 publications

β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

Revealing the Effect of α’ Decomposition on Microstructure Evolution and Mechanical Properties in Ti80 Alloy

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Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

Cited by 2 publications

References 8 publications

&beta;-Grain Refinement of &alpha;+&beta;-Type Ti&ndash;4.5Al&ndash;6Nb&ndash;2Fe&ndash;2Mo Alloy by Using Rare-Earth-Oxide Precipitates

&beta;-Grain Refinement of &alpha;+&beta;-Type Ti&ndash;4.5Al&ndash;6Nb&ndash;2Fe&ndash;2Mo Alloy by Using Rare-Earth-Oxide Precipitates

Revealing the Effect of α’ Decomposition on Microstructure Evolution and Mechanical Properties in Ti80 Alloy

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β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates