Peculiarities of the Formation of High-Defect States in Mechanocomposites and Powders of Niobium and Aluminum under Severe Deformation in Planetary Ball Mills

被引:27
作者
Ditenberg, I. A. [1 ,2 ]
Tyumentsev, A. N. [1 ,2 ]
Denisov, K. I. [1 ,2 ]
Korchagin, M. A. [3 ]
机构
[1] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Tomsk 634021, Russia
[2] Natl Res Tomsk State Univ, Tomsk 634050, Russia
[3] Russian Acad Sci, Inst Solid State Chem & Mechanochem, Siberian Branch, Novosibirsk 630128, Russia
关键词
mechanical activation; ball mills; severe plastic deformation; electron microscopy; nanostructural states; lattice curvature; local internal stress fields; PARTIAL DISCLINATIONS; MICROSTRUCTURE; SUBSTRUCTURE; NANODIPOLES; EVOLUTION; CARRIERS; ALLOY;
D O I
10.1134/S1029959913010098
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The microstructural peculiarities of Nb powder and Nb + Al powder mixtures after mechanical activation in a high-energy planetary ball mill were investigated by transmission electron microscopy. The materials revealed two-level structural states: nanograins of size from 50 to 100 nm that contain subgrains of size similar to 20 nm and less with low-angle misorientation boundaries, elastic lattice curvature chi(ij) approximate to 100 degrees ...200 degrees mu m(-1), curl or curvature gradient partial derivative chi(ij) / partial derivative r > 100 mu m(-2) and high (up to 10E mu m(-1)) local stress gradients (couples). An important factor in the formation of the above states is the capability of nano-objects to reach high elastic lattice curvature, high gradients of this curvature, and high local internal stress gradients at rather low absolute values of the internal stress.
引用
收藏
页码:84 / 92
页数:9
相关论文
共 23 条
[1]  
Avvakumov E. G., 1982, B IZOBR
[2]  
De Wit R., 1973, NAT BUR STAND US A, V77A, p[49, 359, 607]
[3]   Evolution of the Defect Substructure in V-4Ti-4Cr Alloy under Severe Plastic Deformation [J].
Ditenberg, I. A. ;
Tyumentsev, A. N. ;
Grinyaev, K. V. ;
Chernov, V. M. ;
Potapenko, M. M. ;
Korznikov, A. V. .
TECHNICAL PHYSICS, 2011, 56 (06) :815-820
[4]  
Ditenberg I. A., 2009, PERSPECT MAT, P103
[5]  
Grigorieva T.F., 2008, MECHANOCHEMICAL SYNT
[6]  
Gusev A. I., 2007, Nanomaterials, Nanostructures, Nanotechnologies
[7]   Elastic stress state in superhard multielement coatings [J].
Korotaev, A. D. ;
Borisov, D. P. ;
Moshkov, V. Yu. ;
Ovchinnikov, S. V. ;
Pinzhin, Yu. P. ;
Tyumentsev, A. N. .
PHYSICAL MESOMECHANICS, 2009, 12 (5-6) :269-279
[8]  
Korotaev A. D., 2009, PERSPECT MAT, P55
[9]  
Korotaev A. D., 1989, Dispersion Hardening of Refractory Metals
[10]  
Korotaev AD., 1998, Phys. Mesomech, V1, P21