Influence of Al addition on electrical resistivity and phase constitution in quenched Ti-20 mass%V alloy.

勝彦, 池田; 伸也, 小松; 隆史, 杉本; 清, 亀井

doi:10.2464/jilm.42.622

Cited by 11 publications

(4 citation statements)

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“…The decrease and increase of hardness with increasing the content of stabilizing element has been reported in several -titanium alloys where no martensitic phase forms. 6,9) The origin of hardness change in those alloys is well explained by the mutual effect of volume fraction change in athermal ! phase and solid solution strengthening of stabilizing element.…”

Section: Resultsmentioning

confidence: 99%

Shape Memory and Mechanical Properties of Biomedical Ti-Sc-Mo Alloys

Mishima

Nishida

2004

Mater. Trans.

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Ni-free Ti-Sc-Mo shape memory alloys are designed as a substitute for Ti-Ni alloys in the biomedical field. From results of bending and recovery test with heating, Ti-Sc-Mo alloys were found to have superior shape memory effect. The optimum composition for the shape memory effect was Ti-4.0 to 6.0Sc-6.0Mo alloys. The maximum shape recovery strain in the Ti-5.0Sc-6.0Mo alloy was 5.3% measured through cyclic tensile deformation. Vickers hardness and 0.2% proof stress were remarkably decreased and elongation was increased with Sc content. The marked grain refining was also achieved. The relationship between microstructure and mechanical properties was briefly discussed. Microstructure observations and XRD measurements before and after tensile deformation showed that the shape memory effect was associated with the stress induced to 00 transformation.

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Section: Resultsmentioning

confidence: 99%

Shape Memory and Mechanical Properties of Biomedical Ti-Sc-Mo Alloys

Mishima

Nishida

2004

Mater. Trans.

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“…The HV values are seen to have decreased with increasing Al content, especially in the case of the 3.0Al specimen, after which they plateaued, such that the HV of the 4.5Al was the same as that of the 3.0Al. This hardness decrease is attributed to a decrease in the volume fraction of the athermal omega phase at higher Al concentrations, rather than an increase in solid solution hardening by the addition of Al in the beta phase [10].…”

Section: Resultsmentioning

confidence: 90%

Development and Research of Low-Cost Titanium Alloys, Especially Case of Japan

Ikeda

Ueda

2016

MSF

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Titanium (Ti) exhibits many attractive properties that enable practical applications. It is also considered to be a ubiquitous element, since it has the ninth highest Clarke number among all the elements. However, the principal beta-stabilizing elements for Ti, molybdenum and vanadium, can be very expensive, and so many Ti alloys are also costly. For this reason, less expensive alloying elements would be preferable. Iron (Fe) and manganese (Mn) are beta stabilizers for Ti alloys that are readily available, since they have the fourth and eleventh highest Clarke numbers, respectively. Furthermore, since Fe has a large diffusion coefficient in the beta phase of Ti, precipitation of the omega phase occurs more quickly when Fe is added. The behaviors of Ti-Mn and Mn-Fe alloys during heat treatment have been investigated and it has been found that, in some alloys, the isothermal omega phase is precipitated. Because this phase can lead to brittleness of the alloy, it is very important to suppress its precipitation. Since it is well known that aluminum (Al) suppresses isothermal omega precipitation, the present work investigated the effects of Al content on the phase constitution and heat treatment behavior of Ti-8.5 mass%Mn-1 mass%Fe-0, 1.5, 3.0 and 4.5 mass%Al alloys using electrical resistivity, Vickers hardness, and X-ray diffraction measurements. In the case of each of these alloys, whether solution-treated or water-quenched, only the beta phase was identified. The resistivities at room and liquid nitrogen temperatures were found to increase monotonically with Al content, while the Vickers hardness decreased up to 3 mass% Al and then remained constant. The addition of Al was found to suppress omega precipitation.

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“…Vickers hardness, HV, decreased at 3.0Al with increasing Al content, and the HV of 4.5Al had the same value as that of the 3.0Al. The hardness decrease is caused by a larger decrement in hardness due to the decrease in the volume fraction of the athermal omega with Al content than the increase in solid solution hardening by the addition of Al in the beta phase [7].…”

Section: Resultsmentioning

confidence: 95%

Effect of Al Addition on Phase Constitution and Heat Treatment Behavior in Ti-8.5mass%Mn-1mass%Fe-Al Alloys

Ikeda

Ueda

Sumi

et al. 2014

MSF

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Titanium is considered to be a ubiquitous element since it has the 9th-highest Clarke number of all elements. Iron and manganese can also be used as beta stabilizers for Ti alloys, and can be considered to be ubiquitous because of their 4th- and 11th-highest Clarke numbers, respectively. However, investigations into the behavior of Ti-Mn-Fe alloys during heat treatment have shown that in some alloys, the isothermal omega phase is precipitated. Because this phase can lead to brittleness, it is very important to prevent it from forming. It is well known that aluminum can suppress the precipitation of the isothermal omega phase. Thus, in the present study, we investigated the effect of Al content on the phase constitution and heat-treatment behavior of Ti-8.5mass%Mn-1mass%Fe-0 to 4.5mass%Al alloys using electrical resistivity, Vickers hardness, and X-ray diffraction measurements. In all solution-treated and quenched alloys, only the beta phase was identified, thus confirming the suppression of omega-phase precipitation. The resistivity was found to increase monotonically with Al content, while the Vickers hardness decreased up to 3 mass% Al and then remained constant.

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Influence of Al addition on electrical resistivity and phase constitution in quenched Ti-20 mass%V alloy.

Cited by 11 publications

References 1 publication

Shape Memory and Mechanical Properties of Biomedical Ti-Sc-Mo Alloys

Shape Memory and Mechanical Properties of Biomedical Ti-Sc-Mo Alloys

Development and Research of Low-Cost Titanium Alloys, Especially Case of Japan

Effect of Al Addition on Phase Constitution and Heat Treatment Behavior in Ti-8.5mass%Mn-1mass%Fe-Al Alloys

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