Fracture of convoluted and lamellar α2 + γ TiAl alloys

被引：9
|
作者：
Barbi, Nicolas [1 ]
Diologent, Frederic [1 ]
Goodall, Russell [1 ]
Mortensen, Andreas [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Lab Met Mecan, Stn 12, CH-1015 Lausanne, Switzerland
来源：
INTERMETALLICS | 2012年 / 22卷
基金：
英国工程与自然科学研究理事会;
关键词：
Titanium aluminides; based on TiAl; Fracture toughness; Microstructure; Aero-engine components; TITANIUM ALUMINIDE ALLOYS; TIAL-ALLOY; MICROCRACK NUCLEATION; CRACK-PROPAGATION; DISLOCATION DYNAMICS; GRAIN-REFINEMENT; PST CRYSTALS; RESISTANCE; MICROSTRUCTURE; TOUGHNESS;
D O I：
10.1016/j.intermet.2011.11.001
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Fracture toughness tests are conducted at room temperature and 923 K (650 degrees C) on SENB (Single Edge Notched Bend) specimens of three different (alpha(2) + gamma ) TiAl-based alloys. One alloy is a conventional near fully lamellar Ti-45Al-2Mn-2Nb + 0.8%vol TiB2 XD alloy. The second and third have a composition of Ti -46Al-8Ta, with a novel "convoluted" cast microstructure developed for turbine applications and a coarse near fully lamellar microstructure, respectively. The novel alloy displays fracture toughness values of 13 +/- 2 MPa root m at room temperature and 19 MPa root m at 923 K (650 degrees C); these values approach data for lamellar microstructures, known to be optimal for this class of alloy. In particular, shear ligament toughening is observed with a role of retained lamellar colonies in toughening the convoluted microstructure. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：176 / 188
页数：13
相关论文
共 50 条
  • [1] Yield and fracture of lamellar σ/α2 TiAl alloys
    Hazzledine, P.M.
    Kad, B.K.
    Materials Science and Engineering A, 1995, A192-19 (pt 1) : 340 - 346
  • [2] YIELD AND FRACTURE OF LAMELLAR GAMMA/ALPHA(2) TIAL ALLOYS
    HAZZLEDINE, PM
    KAD, BK
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1995, 192 : 340 - 346
  • [3] Intrinsic and extrinsic fracture resistance in lamellar TiAl alloys
    Chan, KS
    Wang, P
    Bhate, N
    Kumar, KS
    ACTA MATERIALIA, 2004, 52 (15) : 4601 - 4614
  • [4] Fracture properties of γ-base TiAl alloys with lamellar microstructure at room temperature
    Gnanamoorthy, R.
    Mutoh, Y.
    Masahashi, N.
    Mizuhara, Y.
    Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 1994, A184 (01): : 37 - 44
  • [5] Influence of grain boundary on the fracture toughness of full lamellar γ-TiAl alloys
    Zheng, RT
    Zhang, YG
    Chen, CQ
    Cheng, G
    RARE METAL MATERIALS AND ENGINEERING, 2003, 32 (12) : 1003 - 1006
  • [6] Effect of deformation twin on fracture mechanism of fully lamellar TiAl alloys
    Lu, Y.H.
    Zhang, Y.G.
    Qiao, L.J.
    Wang, Y.B.
    Chu, W.Y.
    Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research, 2000, 14 (06): : 583 - 586
  • [7] Fracture properties of γ-base TiAl alloys with lamellar microstructure at room temperature
    Gnanamoorthy, R.
    Mutoh, Y.
    Masahashi, N.
    Mizuhara, Y.
    Materials Science and Engineering A, 1994, A184 (01) : 37 - 44
  • [8] Micromechanical modeling of deformation and fracture in lamellar gamma-TiAl alloys
    Cornec, A
    Werwer, M
    Heitmann, V
    GAMMA TITANIUM ALUMINIDES 2003, 2003, : 493 - 501
  • [9] Micro fracture toughness testing of TiAl based alloys with a fully lamellar structure
    Takashima, K
    Halford, TP
    Rudinal, D
    Higo, Y
    Takeyama, M
    Integrative and Interdisciplinary Aspects of Intermetallics, 2005, 842 : 175 - 180
  • [10] Twofold effects of grain boundary on fracture behaviors in fully lamellar TiAl alloys
    Lu, Y.H.
    Zhang, Y.G.
    Qiao, L.J.
    Wang, Y.B.
    Chen, C.Q.
    Chu, W.Y.
    Cailiao Gongcheng/Journal of Materials Engineering, 2001, (02):
12345