Phase equilibria in the Ti-Al binary system

被引：242
作者：
Ohnuma, I [1 ]
Fujita, Y [1 ]
Mitsui, H [1 ]
Ishikawa, K [1 ]
Kainuma, R [1 ]
Ishida, K [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
来源：
ACTA MATERIALIA | 2000年 / 48卷 / 12期
关键词：
titanium; phase equilibria; thermodynamics; order-disorder phenomena; calculation of phase diagrams (CALPHAD);
D O I：
10.1016/S1359-6454(00)00118-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
New experimental results on the phase equilibria between the beta-Ti (A2), alpha-Ti (A3), alpha(2)-Ti3Al (D0(19)) and the gamma-TiAl (L1(0)) phases in the Ti-Al system using specimens with low levels of oxygen are presented. The results obtained on the alpha/gamma and the alpha(2)/gamma equilibria are in good agreement with the previous experimental and calculated phase boundaries, while the ones obtained on the alpha/beta equilibrium deviate significantly from the previously proposed phase diagram. It is confirmed that the beta phase held extends to higher aluminum contents and that the width of the alpha+beta two-phase region is very narrow, less than 1 at.% Al. The presence of the A2/B2 order-disorder transition in the beta phase is also confirmed by a combination of differential scanning calorimetric (DSC) analysis and extrapolation of ordering phase boundaries from the Ti-Al-X (X = Cr, Fe) ternary systems. A thermodynamic analysis has been carried out taking into account the ordering configurations in the beta-Ti (A2)/beta(2)-TiAl (B2), f.c.c.-Al (Al)/gamma-TiAl (L1(0)) and alpha-Ti (A3)/alpha(2)-Ti3Al (D0(19)) equilibria. It is proposed that the anomalous alpha/beta equilibrium is due to the A2/B3 ordering reaction. (C) 2000 Acta Metallurgica Inc. Published bl, Elsevier Science Ltd. All Fights rt ser, ed.
引用
收藏
页码：3113 / 3123
页数：11
相关论文
共 37 条
  • [21] THERMODYNAMIC ASSESSMENT AND CALCULATION OF THE TI-AL SYSTEM
    KATTNER, UR
    LIN, JC
    CHANG, YA
    [J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1992, 23 (08): : 2081 - 2090
  • [22] KAUFMAN L, 1978, CALPHAD, V2, P325, DOI 10.1016/0364-5916(78)90020-2
  • [23] Kornilov I.I., 1956, IAN SSSR KH, V7, P771
  • [24] THE HEATS OF FORMATION IN THE SYSTEMS TITANIUM-ALUMINIUM AND TITANIUM-IRON
    KUBASCHEWSKI, O
    DENCH, WA
    [J]. ACTA METALLURGICA, 1955, 3 (04): : 339 - 346
  • [25] MISHURDA JC, 1991, MICROSTRUCTURE / PROPERTY RELATIONSHIPS IN TITANIUM ALUMINIDES AND ALLOYS, P3
  • [26] Murray J L, 1987, Phase Diagrams of Binary Titanium Alloys, V44, P12
  • [27] CALCULATION OF THE TITANIUM-ALUMINUM PHASE-DIAGRAM
    MURRAY, JL
    [J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1988, 19 (02): : 243 - 247
  • [28] DECOMPOSITION OF ALPHA-PHASE IN TITANIUM-RICH TI-AL ALLOYS
    NAMBOODH.TK
    MCMAHON, CJ
    HERMAN, H
    [J]. METALLURGICAL TRANSACTIONS, 1973, 4 (05): : 1323 - 1331
  • [29] OUCHI K, 1980, P 4 INT C TIT, P559
  • [30] SAMOKHVAL VV, 1971, RUSS J PHYS CHEM+, V45, P1174
1234