Microstructural study of boron-doped Co-Re-Cr alloys by means of transmission electron microscopy and electron energy-loss spectroscopy

被引：9
作者：
Boelitz, Marie-Christin
Brunner, Martin
Voelkl, Rainer
Mukherji, Debashis [2 ]
Roesler, Joachim [2 ]
Glatzel, Uwe [1 ]
机构：
[1] Univ Bayreuth, Chair Met & Alloys, D-95547 Bayreuth, Germany
[2] TU Braunschweig, Inst Werkstoffe, Braunschweig, Germany
来源：
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2012年 / 103卷 / 05期
关键词：
High-temperature materials; Co-Re-Cr alloys; Transmission electron microscopy; Microstructure; OXIDATION RESISTANCE; EELS; STRENGTH; TIB2; EDGE;
D O I：
10.3139/146.110729
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The development of corrosion-resistant alloys with sustained thermal and mechanical stabilities is the focus of current research on high-temperature alloys. It has been shown that the creep behavior and oxidation resistance of Co-Re alloys can be improved by small additions of, e.g., B and Zr. To understand the effect of these elements on mechanical properties, we have characterized the phases and micro-structures in the Co-Re-Cr system using transmission electron microscopy. Zr forms isolated large crystals in the matrix, while B is accommodated in small intergranular (Cr,Re)(2)B borides. The incorporation of up to 23 at.% Re into the Cr2B structure results in increased unit cell constants. The elongated borides occur pervasively along grain boundaries, suggesting that they improve the grain boundary cohesion and thereby the mechanical properties of Co-Re-Cr alloys.
引用
收藏
页码：554 / 558
页数：5
相关论文
共 19 条
[1]  
Beltran A.M., 1987, Superalloys II, P135
[2]   Mo-Si-B alloys: Developing a revolutionary turbine-engine material [J].
Dimiduk, DM ;
Perepezko, JH .
MRS BULLETIN, 2003, 28 (09) :639-645
[3]   FAULT-INDUCED POLYTYPISM IN (CR, FE)(2)B [J].
GOLDFARB, I ;
KAPLAN, WD ;
ARIELY, S ;
BAMBERGER, M .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1995, 72 (04) :963-979
[4]   Oxidation Behaviour of Model Cobalt-Rhenium Alloys During Short-Term Exposure to Laboratory Air at Elevated Temperature [J].
Gorr, B. ;
Trindade, V. ;
Burk, S. ;
Christ, H. -J. ;
Klauke, M. ;
Mukherji, D. ;
Rosler, J. .
OXIDATION OF METALS, 2009, 71 (3-4) :157-172
[5]   Metallic materials for structural applications beyond nickel-based superalloys [J].
Heilmaier, M. ;
Krueger, M. ;
Saage, H. ;
Roesler, J. ;
Mukherji, D. ;
Glatzel, U. ;
Voelkl, R. ;
Huettner, R. ;
Eggeler, G. ;
Somsen, Ch. ;
Depka, T. ;
Christ, H. -J. ;
Gorr, B. ;
Burk, S. .
JOM, 2009, 61 (07) :61-67
[6]   ATEM-EELS study of new diamond-like phases in the B-C-N system [J].
Langenhorst, F ;
Solozhenko, VL .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2002, 4 (20) :5183-5188
[7]   Band structure of TiB2:: Orientation-dependent EELS near-edge fine structure and the effect of the core hole at the B K edge [J].
Lie, K ;
Brydson, R ;
Davock, H .
PHYSICAL REVIEW B, 1999, 59 (08) :5361-5367
[8]   Theoretical site- and symmetry-resolved density of states and experimental EELS near-edge spectra of AlB2 and TiB2 [J].
Lie, K ;
Hoier, R ;
Brydson, R .
PHYSICAL REVIEW B, 2000, 61 (03) :1786-1794
[9]   The effects of boron addition on the microstructure and mechanical properties of Co-Re-based high-temperature alloys [J].
Mukherji, D. ;
Roesler, J. ;
Krueger, M. ;
Heilmaier, M. ;
Boelitz, M. -C. ;
Voelkl, R. ;
Glatzel, U. ;
Szentmiklosi, L. .
SCRIPTA MATERIALIA, 2012, 66 (01) :60-63
[10]   Co-Re-based alloys for high temperature applications: Design considerations and strengthening mechanisms [J].
Mukherji, D. ;
Roesler, J. .
15TH INTERNATIONAL CONFERENCE ON THE STRENGTH OF MATERIALS (ICSMA-15), 2010, 240
12