PHONON MODES AND VIBRATIONAL ENTROPY OF MIXING IN FE-CR

被引：67

作者：

FULTZ, B ^{[1
]}

ANTHONY, L ^{[1
]}

ROBERTSON, JL ^{[1
]}

NICKLOW, RM ^{[1
]}

SPOONER, S ^{[1
]}

MOSTOLLER, M ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.52.3280

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Results from neutron inelastic-scattering experiments on Fe, Cr, and three bcc Fe-Cr alloys were analyzed with a Born-von Karmin model to obtain phonon density-of-states (DOS) curves. We compared the phonon DOS of the bce Fe-Cr alloys to the composite phonon DOS from appropriate fractions of the phonon DOS of the pure metals Fe and Cr. In the high-temperature limit, we obtained the vibrational entropy of mixing of Fe and Cr to be 0.141, 0.201, and 0.214 k(B)/atom for alloys of Fe70Cr30, Fe53Cr47, and Fe30Cr70, respectively, with the disordered solid solution having the larger vibrational entropy. Some expected effects of vibrational entropy on the chemical unmixing transformation in Fe-Cr are discussed.

引用

页码：3280 / 3285

页数：6

共 31 条

[1] A MAGNETOELASTIC STUDY OF CR-FE ALLOYS [J].

ALBERTS, HL ;

LOURENS, JAJ .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1992, 4 (14) :3835-3846

[2] THERMODYNAMIC PROPERTIES OF THE CR-FE SYSTEM [J].

ANDERSSON, JO ;

SUNDMAN, B .

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 1987, 11 (01) :83-92

[3] MAGNITUDE AND ORIGIN OF THE DIFFERENCE IN VIBRATIONAL ENTROPY BETWEEN ORDERED AND DISORDERED FE3AL [J].

ANTHONY, L ;

NAGEL, LJ ;

OKAMOTO, JK ;

FULTZ, B .

PHYSICAL REVIEW LETTERS, 1994, 73 (22) :3034-3037

[4] VIBRATIONAL ENTROPY OF ORDERED AND DISORDERED NI3AL [J].

ANTHONY, L ;

OKAMOTO, JK ;

FULTZ, B .

PHYSICAL REVIEW LETTERS, 1993, 70 (08) :1128-1130

[5]

ANTHONY L, 1994, SOLID SOLID PHASE TR, P467

[6]

BLEY F, 1992, ACTA METALL MATER, V10, P1505

[7] ATOMISTIC MODELING OF DIFFUSIONAL PHASE-TRANSFORMATIONS [J].

CEREZO, A ;

HYDE, JM ;

MILLER, MK ;

PETTS, SC ;

SETNA, RP ;

SMITH, GDW .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1992, 341 (1661) :313-326

[8]

CHUANG YY, 1987, CALPHAD, V11, P57

[9] VIBRATIONAL AND ELASTIC EFFECTS OF POINT-DEFECTS IN SILICON [J].

CLARK, SJ ;

ACKLAND, GJ .

PHYSICAL REVIEW B, 1993, 48 (15) :10899-10908

[10]

DEDERICHS PH, 1981, PHONON STATES ELEC A, V13

← 1 2 3 4 →