The formation of precipitate free zones along grain boundaries in a superalloy and the ensuing effects on its plastic deformation

被引：100

作者：

Krol, T ^{[1
]}

Baither, D ^{[1
]}

Nembach, E ^{[1
]}

机构：

[1] Univ Munster, Inst Materialphys, D-48149 Munster, Germany

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 07期

关键词：

nickel alloy; plastic deformation; grain boundaries; precipitate free zones; transmission electron microscopy;

D O I：

10.1016/j.actamat.2004.01.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The growth of gamma'-precipitate free zones (PFZs) along grain boundaries in polycrystals of the gamma'-strengthened nickel-based superalloy NIMONIC PE16 and the ensuing effects oil the yield strength, the ultimate tensile strength, and the plastic strain to fracture have been experimentally investigated. If the width of PFZs exceeds a well-defined limit, they lower the yield strength drastically. This result is interpreted on the basis of in situ transmission electron microscopic observations of the dislocation processes operating in the PFZs: the ease with which dislocations are generated in the PFZ and the resulting dislocation pile-ups lead to the reduction of the yield strength. Experimental observations of possible effects of PFZs oil the appearance of the stress versus strain-curves and/or on the fracture mode were inconclusive: the observed effects may as well have been caused by the carbide particles formed at the grain boundaries. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2095 / 2108

页数：14

共 35 条

[1]

[Anonymous], PLASTIC DEFORMATION

[2] PRECIPITATION HARDENING [J].

ARDELL, AJ .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1985, 16 (12) :2131-2165

[3] In-situ transmission electron microscopy study of dislocation processes at precipitate-free zones in a γ′-strengthened superalloy [J].

Baither, D ;

Krol, T ;

Nembach, E .

PHILOSOPHICAL MAGAZINE, 2003, 83 (35) :4011-4029

[4]

BAKER TN, 1983, YIELD FLOW FRACTURE

[5]

DIETER GE, 1985, METALS HDB, V8, P20

[6]

GEISLER AH, 1951, PHASE TRANSFORMATION, P387

[7] THE DEFORMATION AND AGEING OF MILD STEEL .3. DISCUSSION OF RESULTS [J].

HALL, EO .

PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION B, 1951, 64 (381) :747-753

[8] POLYCRYSTALLINE STRENGTHENING [J].

HANSEN, N .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1985, 16 (12) :2167-2190

[9] GRAIN-BOUNDARY PRECIPITATE FREE ZONES IN AL-LI ALLOYS [J].

JHA, SC ;

SANDERS, TH ;

DAYANANDA, MA .

ACTA METALLURGICA, 1987, 35 (02) :473-482

[10] DUCTILE FRACTURE IN INTERIOR OF PRECIPITATE FREE ZONE IN AN AL-6.0-PERCENT ZN-2.6-PERCENT MG ALLOY [J].

KAWABATA, T ;

IZUMI, O .

ACTA METALLURGICA, 1976, 24 (09) :817-825

← 1 2 3 4 →