Tensile behavior of γ/α2 interface system in lamellar TiAl alloy via molecular dynamics

被引：28

作者：

Li, Wen ^{[1
,2
]}

Yin, Yajun ^{[1
]}

Xu, Qian ^{[1
]}

Zhou, Jianxin ^{[1
]}

Nan, Hai ^{[2
]}

Ji, Xiaoyuan ^{[1
]}

Shen, Xu ^{[1
]}

Feng, Xin ^{[2
]}

Yu, Wen ^{[1
,2
]}

Tu, Zhixin ^{[1
]}

Pang, Nan ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & & Mould Technol, Wuhan 430074, Hubei, Peoples R China

[2] AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2019年 / 159卷

基金：

中国国家自然科学基金;

关键词：

Tensile deformation; Molecular dynamics; TiAl intermetallic; Phase interface; POLYSYNTHETICALLY TWINNED CRYSTALS; DEFORMATION MECHANISMS; PLASTIC-DEFORMATION; MICROSTRUCTURE; SIMULATION; STRENGTH; MODES;

D O I：

10.1016/j.commatsci.2018.12.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The deformability and strength of lamellar two-phase (gamma and alpha(2)) TiAl intermetallic based alloy strongly depends on the lamellar interfaces in such microstructure. Molecular dynamics simulations are conducted to investigate the mechanical response and the underlying deformation mechanism of two-phase TiAl intermetallic with gamma/alpha(2) interface. Uniaxial tensile loading is applied along three different directions under "free" and "constrained" boundary conditions respectively. The evolution of dislocations and cracks has been investigated in atomic scale. The results show that the stress-strain relation exhibits strong anisotropy. Meanwhile, the dominant failure mode is plastic deformation under free boundary condition while fracture under constrained boundary condition. Moreover, the phase interface can act as dislocation source or crack source under different boundary conditions.

引用

页码：397 / 402

页数：6

共 33 条

[1] [Anonymous], MODELL SIMUL MAT SCI
[2] Microstructure and deformation of two-phase γ-titanium aluminides
Appel, F
Wagner, R
[J]. MATERIALS SCIENCE & ENGINEERING R-REPORTS, 1998, 22 (05) : 187 - 268
[3] Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys
Clemens, Helmut
Mayer, Svea
[J]. ADVANCED ENGINEERING MATERIALS, 2013, 15 (04) : 191 - 215
[4] Strength and plastic deformation behavior of nanolaminate composites with pre-existing dislocations
Damadam, Mohsen
Shao, Shuai
Salehinia, Iman
Mastorakos, Ioannis
Ayoub, Georges
Zbib, Hussein M.
[J]. COMPUTATIONAL MATERIALS SCIENCE, 2017, 138 : 42 - 48
[5] DEFORMATION OF POLYSYNTHETICALLY TWINNED CRYSTALS OF TIAL WITH A NEARLY STOICHIOMETRIC COMPOSITION
FUJIWARA, T
NAKAMURA, A
HOSOMI, M
NISHITANI, SR
SHIRAI, Y
YAMAGUCHI, M
[J]. PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1990, 61 (04): : 591 - 606
[6] A crystal plasticity materials constitutive model for polysynthetically-twinned γ-TiAl+α2-Ti3Al single crystals
Grujicic, M
Batchu, S
[J]. JOURNAL OF MATERIALS SCIENCE, 2001, 36 (12) : 2851 - 2863
[7] Atomsk: A tool for manipulating and converting atomic data files
Hirel, Pierre
[J]. COMPUTER PHYSICS COMMUNICATIONS, 2015, 197 : 212 - 219
[8] Creep deformation of fully lamellar TiAl controlled by the viscous glide of interfacial dislocations
Hsiung, LM
Nieh, TG
[J]. INTERMETALLICS, 1999, 7 (07) : 821 - 827
[9] MICROSTRUCTURES AND PROPERTY TRADEOFFS IN WROUGHT TIAL-BASE ALLOYS
HUANG, SC
[J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1992, 23 (01): : 375 - 377
[10] Effect of lamellar orientation on the strength and operating deformation mechanisms of fully lamellar TiAl alloys determined by micropillar compression
Jesus Palomares-Garcia, Alberto
Teresa Perez-Prado, Maria
Mikel Molina-Aldareguia, Jon
[J]. ACTA MATERIALIA, 2017, 123 : 102 - 114

← 1 2 3 4 →