The influence of soft, precipitate-free zones at grain boundaries in Ti and Al alloys on their fatigue and fracture behavior

被引：118

作者：

Luetjring, G. ^{[1
]}

Albrecht, J. ^{[1
]}

Sauer, C. ^{[1
]}

Krull, T. ^{[1
]}

机构：

[1] Tech Univ Hamburg, D-2100 Hamburg, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 468卷 / 201-209期

关键词：

high-strength Al alloys; beta-Ti alloys; precipitate-free zones; ductility; high-cycle fatigue strength; fracture toughness;

D O I：

10.1016/j.msea.2006.07.168

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper discusses the effect of the presence of soft zones along grain boundaries in high-strength A1 and beta-Ti alloys. Soft zones are deformed preferentially and therefore have a strong effect on fracture related properties. The presentation focuses on the ductility, the high-cycle fatigue strength, and the fracture toughness. For microstructures with pancake-shaped grains, the anisotropy of the mechanical properties is discussed on the basis of the effective slip length, determined by the length of the soft grain boundary zones. In high-strength A1 alloys, the presence of hard inclusions additionally affects the fracture behavior. For beta-Ti alloys, the role of the strength difference between the age hardened matrix and the soft grain boundary layers is discussed. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：201 / 209

页数：9

共 9 条

[1]

[Anonymous], TITAN 95 SCI TECHNOL

[2]

BENEDETTI M, 2004, TI 2003 SCI TECHNOLO, P1659

[3]

KRULL T, 2003, TIT 2003 SCI TECHN W, P1871

[4] Mean stress sensitivity in fatigue of alpha, (alpha+beta) and beta titanium alloys [J].

Lindemann, J ;

Wagner, L .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 234 :1118-1121

[5] Property optimization through microstructural control in titanium and aluminum alloys [J].

Lütjering, G .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 263 (02) :117-126

[6]

Peters JO, 1999, FATIGUE BEHAVIOR OF TITANIUM ALLOYS, P127

[7] Influence of precipitate free zones on the test direction dependence of mechanical properties of high strength aluminum alloys [J].

Sauer, C ;

Busongo, F ;

Lütjering, G .

ALUMINUM ALLOYS 2002: THEIR PHYSICAL AND MECHANICAL PROPERTIES PTS 1-3, 2002, 396-4 :1115-1120

[8]

Sauer C, 2002, FAT 2002 EMAS WEST M, P2043

[9] Anisotropy of mechanical properties in 7010 aluminum thick plates [J].

Solas, D ;

Canova, G ;

Brechet, Y ;

Sainfort, P .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 1996, 217 :1533-1538

← 1 →