Precipitation behavior during hot deformation of powder metallurgy Ti-Nb-Ta-Zr-Al high entropy alloys

被引：51

作者：

Cao, Yuankui ^{[1
]}

Liu, Yong ^{[1
]}

Liu, Bin ^{[1
]}

Zhang, Weidong ^{[1
]}

机构：

[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

来源：

INTERMETALLICS | 2018年 / 100卷

基金：

中国国家自然科学基金;

关键词：

High entropy alloy; Precipitation; Mechanical properties; Powder metallurgy; Microstructure; DYNAMIC RECRYSTALLIZATION; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; SOLID-SOLUTION; MICROSTRUCTURE; PHASE; STABILITY; DUCTILITY; EVOLUTION; TITANIUM;

D O I：

10.1016/j.intermet.2018.06.007

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：

Refractory high entropy alloys with compositions of TiNbTa0.5Zr and TiNbTa0.5ZrAl0.2 were prepared by powder metallurgy. The alloys were hot deformed at 800 degrees C with a strain rate of 0.001s(-1) . The microstructural evolution, precipitation behavior and flow behavior at different compressive strain were investigated. Results show that the alloys are single BCC phase. The hot deformation induces precipitation both in grain boundaries and inside grains. The critical compressive strain for intragranular precipitation of TiNbTa0.5Zr and TiNbTaTa0.5ZrAl0.2 alloys is 20% and 10%, respectively. The precipitates are BCC phase and enriched with Nb and Ta, while the deformed matrix is enriched with Zr. A bi-modal grain size microstructure with micro-scaled intergranular precipitates and nano-scaled intragranular precipitates is achieved after being deformed to 50%. The precipitation leads to a significant flow softening during deformation. And after hot deformation, the TiNbTa0.5ZrAl0.2 alloy has a compressive yield strength of 1500 MPa with a high compressive strain of 18% at room temperature, mainly due to the bi-modal grain size microstructure.

引用

页码：95 / 103

页数：9

共 37 条

[1] Microstructural investigation of plastically deformed Ti20Zr20Hf20Nb20Ta20 high entropy alloy by X-ray diffraction and transmission electron microscopy [J].

Dirras, G. ;

Gubicza, J. ;

Heczel, A. ;

Lilensten, L. ;

Couzinie, J. -P. ;

Perriere, L. ;

Guillot, I. ;

Hocini, A. .

MATERIALS CHARACTERIZATION, 2015, 108 :1-7

[2]

Gao M.C., 2016, High-entropy alloys: fundamentals and applications

[3] Hot deformation characteristics and dynamic recrystallization of the MoNbHfZrTi refractory high-entropy alloy [J].

Guo, N. N. ;

Wang, L. ;

Luo, L. S. ;

Li, X. Z. ;

Chen, R. R. ;

Su, Y. Q. ;

Guo, J. J. ;

Fu, H. Z. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2016, 651 :698-707

[4] Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys [J].

Guo, Sheng ;

Ng, Chun ;

Lu, Jian ;

Liu, C. T. .

JOURNAL OF APPLIED PHYSICS, 2011, 109 (10)

[5] Phase stability in high entropy alloys: Formation of solid-solution phase or amorphous phase [J].

Guo, Sheng ;

Liu, C. T. .

PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL, 2011, 21 (06) :433-446

[6] Precipitation behavior and its effects on tensile properties of FeCoNiCr high-entropy alloys [J].

He, J. Y. ;

Wang, H. ;

Wu, Y. ;

Liu, X. J. ;

Mao, H. H. ;

Nieh, T. G. ;

Lu, Z. P. .

INTERMETALLICS, 2016, 79 :41-52

[7] A precipitation-hardened high-entropy alloy with outstanding tensile properties [J].

He, J. Y. ;

Wang, H. ;

Huang, H. L. ;

Xu, X. D. ;

Chen, M. W. ;

Wu, Y. ;

Liu, X. J. ;

Nieh, T. G. ;

An, K. ;

Lu, Z. P. .

ACTA MATERIALIA, 2016, 102 :187-196

[8] Phase-Transformation Ductilization of Brittle High-Entropy Alloys via Metastability Engineering [J].

Huang, Hailong ;

Wu, Yuan ;

He, Junyang ;

Wang, Hui ;

Liu, Xiongjun ;

An, Ke ;

Wu, Wei ;

Lu, Zhaoping .

ADVANCED MATERIALS, 2017, 29 (30)

[9] Tensile properties of an AlCrCuNiFeCo high-entropy alloy in as-cast and wrought conditions [J].

Kuznetsov, A. V. ;

Shaysultanov, D. G. ;

Stepanov, N. D. ;

Salishchev, G. A. ;

Senkov, O. N. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2012, 533 :107-118

[10] Microstructure evolution and critical stress for twinning in the CrMnFeCoNi high-entropy alloy [J].

Laplanche, G. ;

Kostka, A. ;

Horst, O. M. ;

Eggeler, G. ;

George, E. P. .

ACTA MATERIALIA, 2016, 118 :152-163

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