Microstructure and mechanical properties of laser melting deposited γ-TiAl intermetallic alloys

被引:97
作者
Qu, H. P. [1 ]
Wang, H. M. [1 ]
机构
[1] Beihang Univ, Sch Mat Sci & Engn, Lab Laser Mat Proc & Mfg, Beijing 10083, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 466卷 / 1-2期
基金
中国国家自然科学基金;
关键词
laser melting deposition; gamma-TiAl intermetallic alloys; microstructure; mechanical properties;
D O I
10.1016/j.msea.2007.02.073
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Ti-47Al-2.5V-1Cr intermetallic alloy was fabricated by the laser melting deposition (LMD) manufacturing process. The microstructure was characterized by OM, SEM, TEM and XRD. The tensile properties and Vickers microhardness were evaluated on both longitudinal and transverse directions. Results showed that full density directionally solidified (DS) columnar grain with fully lamellar (FL) microstructure consisted of gamma-TiAl and alpha(2)-Ti3Al lamellae was formed in the as-laser deposited samples along the longitudinal direction due to the high thermal gradient. The room-temperature tensile strength of the as-deposited alloy is up to approximately 650 MPa in the longitudinal direction and 600 MPa in the transverse direction, while the tensile elongation on both directions is approximately 0.6%. The tensile fracture surfaces are different for the longitudinal and transverse directions, indicating that the room-temperature tensile properties were affected by the DS inicrostructure. (c) 2007 Published by Elsevier B.V.
引用
收藏
页码:187 / 194
页数:8
相关论文
共 29 条
[1]   The effect of long term exposure in oxidising and corroding environments on the tensile properties of two gamma-TiAl alloys [J].
Bacos, MP ;
Morel, A ;
Naveos, S ;
Bachelier-Iocq, A ;
Josso, P ;
Thomas, M .
INTERMETALLICS, 2006, 14 (01) :102-113
[2]   Grain refinement in γ-TiAl-based alloys by solid state phase transformations [J].
Clemens, H. ;
Bartels, A. ;
Bystrzanowski, S. ;
Chladil, H. ;
Leitner, H. ;
Dehm, G. ;
Gerling, R. ;
Schimansky, F. P. .
INTERMETALLICS, 2006, 14 (12) :1380-1385
[3]  
Griffith M., 1998, P INT C APPL LAS EL, V1, P1
[4]   Understanding thermal behavior in the LENS process [J].
Griffith, ML ;
Schlienger, ME ;
Harwell, LD ;
Oliver, MS ;
Baldwin, MD ;
Ensz, MT ;
Essien, M ;
Brooks, J ;
Robino, CV ;
Smugeresky, JE ;
Hofmeister, WH ;
Wert, MJ ;
Nelson, DV .
MATERIALS & DESIGN, 1999, 20 (2-3) :107-113
[5]   In situ TEM observations of interface sliding and migration in a refined lamellar TiAl alloy [J].
Hsiung, LM ;
Schwartz, AJ ;
Nieh, TG .
INTERMETALLICS, 2004, 12 (7-9) :727-732
[6]   MICROSTRUCTURE AND TENSILE PROPERTIES OF TIAL COMPOUNDS FORMED BY REACTIVE FOIL METALLURGY [J].
JAKOB, A ;
SPEIDEL, MO .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, 189 (1-2) :129-136
[7]   Mechanisms and effect of microstructure on creep of TiAl-based alloys [J].
Karthikeyan, S ;
Viswanathan, GB ;
Gouma, PI ;
Vasudevan, VK ;
Kim, YW ;
Mills, MJ .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 329 :621-630
[8]   RAPID PROTOTYPING WITH CO2-LASER RADIATION [J].
KREUTZ, EW ;
BACKES, G ;
GASSER, A ;
WISSENBACH, K .
APPLIED SURFACE SCIENCE, 1995, 86 (1-4) :310-316
[9]   EFFECT OF MICROSTRUCTURE ON FATIGUE AND TENSILE PROPERTIES OF THE GAMMA-TIAL ALLOY TI-46.5AL-3.ONB-2.1CR-0.2W [J].
KUMPFERT, J ;
KIM, YW ;
DIMIDUK, DM .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1995, 192 :465-473
[10]   Practical considerations and capabilities for laser assisted direct metal deposition [J].
Lewis, GK ;
Schlienger, E .
MATERIALS & DESIGN, 2000, 21 (04) :417-423