Effect of alloy composition on the volume fraction of beta phase in duplex titanium alloys. [Ti-6Al-4V]

Journal Article · Sun Aug 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90154-K· OSTI ID:6137671

Lee, Hyuck Mo; Soh, Jeong Ryong; Lee, Zin Hyoung ^[1]; Kim, Yong Suk ^[2]

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1. Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of)
2. Research Inst. of Industrial Science and Technology, Pohang (Korea, Republic of)

Titanium alloys are strong, light, corrosion resistant and superplastic. While many of them show superplastic behavior, working and forging temperatures are still high, 850-925[degree]C, and their range is narrow. Moreover, the material's resistance to deformation is not negligible and, therefore, the cost of making dies and presses for forging or hot deformation is high and it poses a serious problem. To increase the efficiency and to reduce the temperature of hot deformation, increasing the volume fraction of the beta phase present in duplex titanium alloys is suggested. With the introduction of the beta-modified Ti-6Al-4V alloy the decrease in the temperature and the increase in the strain rate of the superplastic regime promise to make superplastic forming of this alloy even more economical, and many researches have been made. In this study, efforts are put on designing new duplex alloys based on the Ti-6Al-4V and Ti-Al-Fe systems, which will have a beta volume fraction of 40-50 percent at around 800[degree]C. To accomplish this, experimental volume fractions of the beta phase in several titanium alloys are being compared with predicted and calculated ones using phase equilibria analyses and some suggestions will be made on modifying the alloy compositions. For comparison, the quaternary Ti-V-Fe-Al system and their subsystems are chosen due to availability of both experimental and thermodynamic data.

• OSTI ID: 6137671
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:4; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
DATA
DEFORMATION
DESIGN
EVALUATION
EXPERIMENTAL DATA
INFORMATION
MICROSTRUCTURE
NUMERICAL DATA
PHASE STUDIES
STRAIN RATE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS