Microstructural characteristics of tungsten-base nanocomposites produced from micropowders by high-pressure torsion

被引:44
作者
Edalati, Kaveh [1 ,2 ]
Toh, Shoichi [3 ]
Iwaoka, Hideaki [1 ]
Horita, Zenji [1 ,2 ]
机构
[1] Kyushu Univ, Dept Mat Sci & Engn, Fac Engn, Fukuoka 8190395, Japan
[2] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res WPI CNER I2, Fukuoka 8190395, Japan
[3] Kyushu Univ, Res Lab High Voltage Electron Microscopy, Fukuoka 8190395, Japan
关键词
Ultrafine grain; Nanostructure; Severe plastic deformation; Consolidation; Dislocation; SEVERE PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; COLD-CONSOLIDATION; COMPOSITE; POWDERS; ALUMINUM; ALLOY; DISLOCATIONS; FABRICATION; BEHAVIOR;
D O I
10.1016/j.actamat.2012.02.048
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Micropowder mixtures of W-50% Al, W-50% Ti and W-50% Ni were subjected to severe plastic deformation at 573 K using high-pressure torsion (HPT). The powder mixtures were consolidated and nanocomposites of W/Ti, W/Ti and W/Ni, with average grain sizes as small as similar to 9, similar to 15 and similar to 12 nm, respectively, were formed by imposing large shear strains. The nanocomposites exhibited Vickers microhardness as high as similar to 900 Hv, a level that has rarely been reported for metal-matrix composites. X-ray diffraction analyses together with high-resolution transmission electron microscopy showed that in addition to grain refinement, an increase in the fraction of grain boundaries up to 20%, the dissolution of elements in each other up to similar to 15 mol.%, an increase in the lattice strain up to 0.6%, and an increase in density of edge dislocations up to 10(16) m(-2) occurred by HPT. The current study introduces the HPT process as an effective route for the production of ultrahigh-strength W-base nanocomposites, fabrication of which is not generally easy when processing at high temperatures because of interfacial reaction and formation of brittle intermetallics. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:3885 / 3893
页数:9
相关论文
共 52 条
[1]   Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders [J].
Alexandrov, IV ;
Zhu, YT ;
Lowe, TC ;
Islamgaliev, RK ;
Valiev, RZ .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1998, 29 (09) :2253-2260
[2]   Consolidation of nanometer sized powders using severe plastic torsional straining [J].
Alexandrov, IV ;
Zhu, YT ;
Lowe, TC ;
Islamgaliev, RK ;
Valiev, RZ .
NANOSTRUCTURED MATERIALS, 1998, 10 (01) :45-54
[3]   The influence of stacking fault energy on the mechanical properties of nanostructured Cu and Cu-Al alloys processed by high-pressure torsion [J].
An, X. H. ;
Lin, Q. Y. ;
Wu, S. D. ;
Zhang, Z. F. ;
Figueiredo, R. B. ;
Gao, N. ;
Langdon, T. G. .
SCRIPTA MATERIALIA, 2011, 64 (10) :954-957
[4]  
[Anonymous], 1992, ASM HDB
[5]   Production of Al/Al2O3 Nanocomposites through Consolidation by High-Pressure Torsion [J].
Ashida, Maki ;
Horita, Zenji ;
Kita, Takuji ;
Kato, Akira .
MATERIALS TRANSACTIONS, 2012, 53 (01) :13-16
[6]   New procedure to generate stable nanocrystallites by severe plastic deformation [J].
Bachmaier, A. ;
Hohenwarter, A. ;
Pippan, R. .
SCRIPTA MATERIALIA, 2009, 61 (11) :1016-1019
[7]  
Cullity B. D., 1978, ELEMENTS XRAY DIFFRA
[8]   Fabrication of ultrafine-grained Ti-(5-50wt.%)Al2O3 composites using high-pressure torsion [J].
Edalati, K. ;
Iwaoka, H. ;
Horita, Z. ;
Tanaka, M. ;
Higashida, K. ;
Fujiwara, H. ;
Ameyama, K. .
KOVOVE MATERIALY-METALLIC MATERIALS, 2011, 49 (01) :85-92
[9]   In situ production of bulk intermetallic-based nanocomposites and nanostructured intermetallics by high-pressure torsion [J].
Edalati, Kaveh ;
Toh, Shoichi ;
Watanabe, Masashi ;
Horita, Zenji .
SCRIPTA MATERIALIA, 2012, 66 (06) :386-389
[10]   Unusual hardening in Ti/Al2O3 nanocomposites produced by high-pressure torsion followed by annealing [J].
Edalati, Kaveh ;
Iwaoka, Hideaki ;
Horita, Zenji ;
Konno, Mitsuru ;
Sato, Takahiro .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2011, 529 :435-441