Suppression of Ni4Ti3 Precipitation by Grain Size Refinement in Ni-Rich NiTi Shape Memory Alloys

被引：55

作者：

Prokofiev, Egor A. ^{[1
]}

Burow, Juri A. ^{[2
]}

Payton, Eric J. ^{[2
]}

Zarnetta, Robert ^{[2
]}

Frenzel, Jan ^{[2
]}

Gunderov, Dmitry V. ^{[1
]}

Valiev, Ruslan Z. ^{[1
]}

Eggeler, Gunther ^{[2
]}

机构：

[1] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia

[2] Ruhr Univ Bochum, Inst Werkstoffe, D-44801 Bochum, Germany

来源：

ADVANCED ENGINEERING MATERIALS | 2010年 / 12卷 / 08期

基金：

俄罗斯基础研究基金会;

关键词：

SEVERE PLASTIC-DEFORMATION; MARTENSITIC TRANSFORMATIONS; PHASE-TRANSFORMATIONS; CRYSTAL-STRUCTURE; MICROSTRUCTURE; SEGREGATION; MORPHOLOGY; BEHAVIOR; CARBON;

D O I：

10.1002/adem.201000101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Severe plastic deformation (SPD) processes, such as equal channel angular pressing (ECAP) and high pressure torsion (HPT), are successfully employed to produce ultra fine grain (UTG) and nanocrystalline (NC) microstructures in a Ti-50.7 at% Ni shape memory alloy. The effect of grain size on subsequent Ni-rich particle precipitation during annealing is investigated by transmission electron microscopy (TEM), selected area electron diffraction (SAD, SAED), and X-ray diffraction (XRD). It is observed that Ni4Ti3 precipitation is suppressed in grains of cross-sectional equivalent diameter below approximately 150 nm, and that particle coarsening is inhibited by very fine grain sizes. The results suggest that fine grain sizes impede precipitation processes by disrupting the formation of self-accommodating particle arrays and that the arrays locally compensate for coherency strains during nucleation and growth.

引用

页码：747 / 753

页数：7

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