Relationships between microstructure and fatigue crack propagation paths in Al-Si-Mg cast alloys

被引：45

作者：

Lados, Diana A. ^{[1
]}

Apelian, Diran ^{[1
]}

机构：

[1] Worcester Polytech Inst, Met Proc Inst, Worcester, MA 01609 USA

来源：

ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 3-4期

关键词：

Al-Si-Mg cast alloys; fatigue crack growth; long and small cracks; crack paths; microstructure; plastic zone;

D O I：

10.1016/j.engfracmech.2007.01.027

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Fatigue crack propagation of long and small cracks was investigated for hypoeutectic and eutectic Al-Si-Mg cast alloys. Crack propagation behavior in the near-threshold regime and Regions II and III was related to microstructural constituents namely primary alpha-Al dendrites and volume fraction and morphology of eutectic Si. Long crack thresholds reflect combined closure effects of global residual stress and microstructure/roughness. The small crack threshold behavior is explained through closure independent mechanisms, specifically through the barrier effects of characteristic microstructural features specific to each alloy. In Regions II and III changes in fracture surface roughness are associated with different crack propagation mechanisms at the microstructure scale. The extent of the plastic zone ahead of the crack tip was successfully used to explain the observed changes in crack propagation mechanisms. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：821 / 832

页数：12

共 31 条

[1] The effect of solidification rate on the growth of small fatigue cracks in a cast 319-type aluminum alloy [J].

Caton, MJ ;

Jones, JW ;

Boileau, JM ;

Allison, JE .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1999, 30 (12) :3055-3068

[2] Fatigue crack growth and fracture paths in sand cast B319 and A356 aluminum alloys [J].

Chan, KS ;

Jones, P ;

Wang, QG .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 341 (1-2) :18-34

[3] CONSIDERATIONS OF GRAIN-ORIENTATION AND WORK-HARDENING ON SHORT-FATIGUE-CRACK MODELING [J].

DELOSRIOS, ER ;

NAVARRO, A .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1990, 61 (03) :435-449

[4] Relationship between microstructural extremum and fracture path in a cast Al-Si-Mg alloy [J].

Dighe, MD ;

Gokhale, AM .

SCRIPTA MATERIALIA, 1997, 37 (09) :1435-1440

[5] An evaluation of the adjusted compliance ratio technique for determining the effective stress intensity factor [J].

Donald, JK ;

Bray, GH ;

Bush, RW .

FATIGUE AND FRACTURE MECHANICS: TWENTY-NINTH VOLUME, 1999, 1332 :674-695

[6]

Elber W., 1971, AMAGE TOLERANCE AIRC, P230, DOI DOI 10.1520/STP486-EB

[7] The debonding and fracture of Si particles during the fatigue of a cast Al-Si alloy [J].

Gall, K ;

Yang, N ;

Horstemeyer, M ;

McDowell, DL ;

Fan, JH .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1999, 30 (12) :3079-3088

[8]

Kubota M, 1998, MATER SCI RES INT, V4, P193

[9] Effects of dendrite cell size and eutectic si particle morphology on fatigue crack growth in cast and HIPed AC4CH alloys [J].

Kumai, S ;

Aoki, S ;

Han, SW ;

Sato, A .

MATERIALS TRANSACTIONS JIM, 1999, 40 (07) :685-691

[10]

Kumai S., 1995, Journal of Japan Institute of Light Metals, V45, P204, DOI 10.2464/jilm.45.204

← 1 2 3 4 →