SIMULTANEOUS STUDY OF VACANCY FORMATION AND MIGRATION AT HIGH-TEMPERATURES IN B2-TYPE FE ALUMINIDES

被引：176
作者：
WURSCHUM, R
GRUPP, C
SCHAEFER, HE
机构：
[1] Institut für Theoretische und Angewandte Physik, Universität Stuttgart, 70569 Stuttgart
来源：
PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.75.97
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In order to study the vacancy formation and migration the temperature variation and the equilibration process of the thermal vacancy concentration in B2-type Fe aluminides (Fe63Al37, Fe61Al39) were measured by means of the positron lifetime technique using a diffused 58Co positron emitter. The equilibration process occurs rather slowly, indicating a low vacancy mobility. The present values for the enthalpies of vacancy formation HVF=1.04 eV (Fe63Al37) or 0.98 eV (Fe61Al39) and migration HVM=1.7 eV are discussed with respect to the self-diffusion mechanisms. © 1995 The American Physical Society.
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页码：97 / 100
页数：4
相关论文
共 37 条
[1]  
BADURA K, 1995, MATER SCI FORUM, V175-, P295, DOI 10.4028/www.scientific.net/MSF.175-178.295
[2]  
BADURA KA, 1993, Z METALLKD, V84, P405
[3]  
Bakker H., 1987, Materials Science Forum, V15-18, P1155, DOI 10.4028/www.scientific.net/MSF.15-18.1155
[4]   THERMAL FORMATION OF VACANCIES IN TIAL [J].
BROSSMANN, U ;
WURSCHUM, R ;
BADURA, K ;
SCHAEFER, HE .
PHYSICAL REVIEW B, 1994, 49 (10) :6457-6461
[5]   CORRELATION OF THE HARDNESS AND VACANCY CONCENTRATION IN FEAL [J].
CHANG, YA ;
PIKE, LM ;
LIU, CT ;
BILBREY, AR ;
STONE, DS .
INTERMETALLICS, 1993, 1 (02) :107-115
[6]   THERMODYNAMICS AND DEFECT STRUCTURE OF INTERMETALLIC PHASES WITH THE B2 (CSCL) STRUCTURE [J].
CHANG, YA ;
NEUMANN, JP .
PROGRESS IN SOLID STATE CHEMISTRY, 1982, 14 (04) :221-301
[7]   ROOM-TEMPERATURE DEFORMATION OF SINGLE-CRYSTAL-B2 FE-AL ALLOYS - THE EFFECT OF STOICHIOMETRY AND COOLING RATE [J].
CRIMP, MA ;
VEDULA, K .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1991, 63 (03) :559-570
[8]   THE RECOVERY OF QUENCHED-IN VACANCIES IN FE-AL (6.3 TO 28.3 AT PERCENT) ALLOYS STUDIED BY POSITRON-ANNIHILATION [J].
DLUBEK, G ;
BRUMMER, O ;
MOSER, B .
CRYSTAL RESEARCH AND TECHNOLOGY, 1982, 17 (08) :951-961
[9]   ELEMENTARY DIFFUSION JUMP OF IRON ATOMS IN INTERMETALLIC PHASES STUDIED BY MOSSBAUER-SPECTROSCOPY .2. FROM ORDER TO DISORDER [J].
FELDWISCH, R ;
SEPIOL, B ;
VOGL, G .
ACTA METALLURGICA ET MATERIALIA, 1995, 43 (05) :2033-2039
[10]   EQUILIBRIUM-POINT DEFECTS IN INTERMETALLICS WITH THE B2 STRUCTURE - NIAL AND FEAL [J].
FU, CL ;
YE, YY ;
YOO, MH ;
HO, KM .
PHYSICAL REVIEW B, 1993, 48 (09) :6712-6715
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