On the remarkable thermal stability of nanocrystalline cobalt via alloying

被引：15

作者：

Bachmaier, A. ^{[1
]}

Motz, C. ^{[1
]}

机构：

[1] Univ Saarland, Chair Mat Sci & Methods, D-66123 Saarbrucken, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 624卷

基金：

奥地利科学基金会;

关键词：

Nanostructured materials; Severe plastic deformation; Thermal stability; Cobalt; SUPERSATURATED SOLID-SOLUTIONS; GRAIN-GROWTH; FREE-VOLUME; DEFORMATION; MICROSTRUCTURE; TEMPERATURE; REFINEMENT; SATURATION; DEFECTS; METALS;

D O I：

10.1016/j.msea.2014.11.062

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanostructured Co materials are produced by severe plastic deformation via alloying with small amounts of C and larger amounts of Cu. The thermal stability of the different nanostructured Co materials is studied through isothermal annealing at different temperatures for various times and compared to the stability of severe plastically deformed high-purity nanocrystalline Co. The microstructural changes taking place during annealing are evaluated by scanning electron microscopy, transmission electron microscopy and microhardness measurements. In the present work it is shown that the least stable nanostructured material is the single-phase high purity Co. Alloying with C improves the thermal stability to a certain extent. A remarkable thermal stability is achieved by alloying Co with Cu resulting in stabilized nanostructures even after annealing for long times at high temperatures. The essential reason for the enhanced thermal stability is to be found in the immiscibility of both components of the alloy. (C) 2014 The Authors. Published by Elsevier B.V.

引用

页码：41 / 51

页数：11

共 64 条

[1] Nanogranulation process into magneto-resistant Co-Cu alloy on the route of bulk mechanical alloying [J].

Aizawa, T ;

Zhou, C .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2000, 285 (1-2) :1-7

[2] THEORIES OF NORMAL GRAIN-GROWTH IN PURE SINGLE-PHASE SYSTEMS [J].

ATKINSON, HV .

ACTA METALLURGICA, 1988, 36 (03) :469-491

[3] Microstructural evolution in immiscible alloys processed by High-Pressure Torsion [J].

Bachmaier, A. ;

Neubauer, E. ;

Kitzmantel, M. ;

Pippan, R. ;

Motz, C. .

6TH INTERNATIONAL CONFERENCE ON NANOMATERIALS BY SEVERE PLASTIC DEFORMATION (NANOSPD6), 2014, 63

[4] New insights on the formation of supersaturated solid solutions in the Cu-Cr system deformed by high-pressure torsion [J].

Bachmaier, A. ;

Rathmayr, G. B. ;

Bartosik, M. ;

Apel, D. ;

Zhang, Z. ;

Pippan, R. .

ACTA MATERIALIA, 2014, 69 :301-313

[5] The formation of supersaturated solid solutions in Fe-Cu alloys deformed by high-pressure torsion [J].

Bachmaier, A. ;

Kerber, M. ;

Setman, D. ;

Pippan, R. .

ACTA MATERIALIA, 2012, 60 (03) :860-871

[6]

Bachmaier A, 2010, REV ADV MATER SCI, V25, P16

[7] New procedure to generate stable nanocrystallites by severe plastic deformation [J].

Bachmaier, A. ;

Hohenwarter, A. ;

Pippan, R. .

SCRIPTA MATERIALIA, 2009, 61 (11) :1016-1019

[8]

Batos A., 2006, ACTA MAT, V54, P2451

[9]

Beck A., 1948, T AIME, V175, P372

[10]

Betteridge W., 1982, COBALT ITS ALLOY

← 1 2 3 4 5 6 7 →