Effect of strain rate on brittle-ductile transition mechanism of the Ti45Al10Nb alloy with fully lamellar microstructure

被引：0

作者：

Liu, ZC ^{[1
]}

Zhang, WJ

Li, SJ

Chen, GL

Kim, YW

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Universal Energy Syst Inc, Mat Res Div, Dayton, OH 45432 USA

来源：

RARE METAL MATERIALS AND ENGINEERING | 2000年 / 29卷 / 03期

关键词：

Ti45Al10Nb; intermetallics; brittle-ductile transition; strain rate;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of strain rate and temperature on the tensile yield strength and elongation of titanium aluminides are studied. The alloy Ti-45Al-10Nb (at%) has a fully lamellar microstructure. The test results show that the brittle-ductile transition (BDT) temperature increases with the increases of strain rate and temperature. The activation energy is 330kJ/mol, which approximates to the self-diffusion activation energy of atoms in the TiAl alloy. Fractography and dislocation configuration analyses demonstrate that the brittle-ductile transition of the alloy Ti-45Al-10Nb is controlled by dislocation climb.

引用

页码：185 / 189

页数：5

共 7 条

[1] KIM YW, 1994, JOM-J MIN MET MAT S, V46, P30, DOI 10.1007/BF03220745
[2] Kim YW, 1995, GAMMA TITANIUM ALUMINIDES, P637
[3] EFFECT OF MICROSTRUCTURE ON FATIGUE AND TENSILE PROPERTIES OF THE GAMMA-TIAL ALLOY TI-46.5AL-3.ONB-2.1CR-0.2W
KUMPFERT, J
KIM, YW
DIMIDUK, DM
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1995, 192 : 465 - 473
[4] Deformation mechanisms in fine-grained Ti-Al alloys
Morris, MA
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 224 (1-2): : 12 - 20
[5] YAMAGUCHI M, 1993, STRUCTURAL INTERMETALLICS, P127
[6] YU W, 1997, ACTA METALLURGICA SI, V33, P21
[7] ZENER C, 1994, J APPL PHYS, V39, P163

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