Composition Dependence of the Hardness of Laves Phases in the Fe-Nb and Co-Nb Systems

被引：0

作者：

Voss, S. ^{[1
]}

Stein, F. ^{[1
]}

Palm, M. ^{[1
]}

Gruener, D.

Kreiner, G.

Frommeyer, G. ^{[1
]}

Raabe, D. ^{[1
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

来源：

ADVANCED INTERMETALLIC-BASED ALLOYS FOR EXTREME ENVIRONMENT AND ENERGY APPLICATIONS | 2009年 / 1128卷

关键词：

MECHANICAL-PROPERTIES; PALMQVIST CRACK; DEFORMATION; TOUGHNESS; ALLOYS;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single-phase Fe-Nb and Co-Nb Laves phase alloys were produced by arc melting and levitation melting. By casting the levitation melted alloys in a preheated mould and subsequent slow cooling to room temperature, solid rods of 15 mm in diameter and about 100 mm length of the brittle Laves phases were obtained. Within the extended homogeneity ranges of the NbFe(2) and NbCo(2) Laves phases, the Vickers hardness was measured in dependence on composition. The results show that the hardness has a maximum at the stoichiometric composition in both systems, indicating defect softening. Nanoindentation measurements on a Co-Nb diffusion couple confirm the dependence of the hardness on composition. In addition, these measurements indicate that the crystal structure of the Laves phase polytype - cubic or hexagonal - seems to have no effect on the hardness. Indentation fracture toughness K(IC-IF) data for the different polytypes of the Laves phases were evaluated from the Palmquist cracks originating from the edges of the Vickers indentations.

引用

页码：469 / 474

页数：6

共 17 条

[1]

Eichler K, 1971, WISS Z TU DRESDEN, V20, P399

[2] Preparation, phase stability and structure of the C36 Laves phase Nb1-xCo2+x [J].

Gruener, Daniel ;

Stein, Frank ;

Palm, Martin ;

Konrad, Joachim ;

Ormeci, Alim ;

Schnelle, Walter ;

Grin, Yuri ;

Kreiner, Guido .

ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 2006, 221 (5-7) :319-333

[3]

GRUNER D, 2007, THESIS TU DRESDEN, P1

[4]

HE C, ADV INTERMETALLIC BA

[5] The mechanical properties and the deformation microstructures of the C15 Laves phase Cr2Nb at high temperatures [J].

Kazantzis, A. V. ;

Aindow, M. ;

Jones, I. P. ;

Triantafyllidis, G. K. ;

De Hosson, J. Th. M. .

ACTA MATERIALIA, 2007, 55 (06) :1873-1884

[6]

KREINER G, ADV INTERMETALLIC BA

[7]

LEITNER G, 1971, THESIS TU DRESDEN, P129

[8] Physical metallurgy and mechanical properties of transition-metal Laves phase alloys [J].

Liu, CT ;

Zhu, JH ;

Brady, MP ;

McKamey, CG ;

Pike, LM .

INTERMETALLICS, 2000, 8 (9-11) :1119-1129

[9] Deformation behaviour of Al-containing C14 laves phase alloys [J].

Machon, L ;

Sauthoff, G .

INTERMETALLICS, 1996, 4 (06) :469-481

[10] A FRACTURE-MECHANICS ANALYSIS OF INDENTATION-INDUCED PALMQVIST CRACK IN CERAMICS [J].

NIIHARA, K .

JOURNAL OF MATERIALS SCIENCE LETTERS, 1983, 2 (05) :221-223

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