Fracture energy evaluation on 7075-T651 aluminum alloy welds determined by instrumented impact pendulum

被引：11

作者：

Ambriz, R. R. ^{[1
]}

Jaramillo, D. ^{[1
]}

Garcia, C. ^{[2
]}

Curiel, F. F. ^{[3
]}

机构：

[1] Inst Politecn Nacl CIITEC IPN, Cerrada Cecati S-N Col Sta Catarina, Azcapotzalco 02250, DF, Mexico

[2] Carleton Univ, Mech & Aerosp Engn, 1125 Colonel By Dr, Ottawa, ON K1S 5B6, Canada

[3] Univ Autonoma Coahuila UAdeC, Fac Met, Carr 57,Km 5, Monclova, Coahuila, Mexico

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2016年 / 26卷 / 04期

关键词：

7075-T651 welded joint; instrumented Charpy pendulum; force-time curve; fracture energy; dynamic yield strength; MICROSTRUCTURAL EVOLUTION; DYNAMIC FRACTURE; HIGH-STRENGTH; TOUGHNESS; BEHAVIOR;

D O I：

10.1016/S1003-6326(16)64157-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

By using an instrumented impact pendulum, the force versus time curves of 7075-T651 aluminum welds were obtained from standard Charpy-V samples. Considering the force-time curves and constant impact velocity, the fracture energies for different zones were quantified. A fracture energy improvement for the HAZ (33.6 J) was observed in comparison with the weld metal (7.88 J), and base metal (5.37 J and 7.37 J for longitudinal and transverse directions, respectively). This toughness increment was attributed to the microstructural transformation caused by the thermodynamic instability of eta' precipitates during the welding. Fracture energy for weld metal was higher than that for base metal, probably due to pores created during solidification. Regarding the dynamic yielding force obtained from the force-time curves, an approximation to the dynamic yield strength for weld, HAZ and base metal was determined. Fracture surfaces revealed an intergranular failure for base metal in longitudinal direction, whereas a predominately brittle failure (cleavage) with some insights of ductile characteristics was observed for the transverse direction. In contrast, a ductile failure was observed for weld metal and HAZ.

引用

页码：974 / 983

页数：10

共 19 条

[1] Tensile Properties and Fusion Zone Hardening for GMAW and MIEA Welds of a 7075-T651 Aluminum Alloy [J].

Alatorre, N. ;

Ambriz, R. R. ;

Noureddine, B. ;

Amrouche, A. ;

Talha, A. ;

Jaramillo, D. .

ACTA METALLURGICA SINICA-ENGLISH LETTERS, 2014, 27 (04) :694-704

[2] Dynamic fracture toughness of Al-7Si-Mg (A357) aluminum alloy [J].

Alexopoulos, Nikolaos D. ;

Stylianos, Antonis ;

Campbell, John .

MECHANICS OF MATERIALS, 2013, 58 :55-68

[3] Determination of the tensile behavior at middle strain rate of AA6061-T6 aluminum alloy welds [J].

Ambriz, R. R. ;

Froustey, C. ;

Mesmacque, G. .

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 2013, 60 :107-119

[4]

[Anonymous], B209 ASTM

[5] Fracture mechanisms assessment of a multilayer material with high strength and excellent impact toughness based on the aerospace Al 7075 alloy [J].

Cepeda-Jimenez, C. M. ;

Ruano, O. A. ;

Carreno, F. .

REVISTA DE METALURGIA, 2012, 48 (04) :290-302

[6] An experimental study on the dynamic fracture of extruded AA6xxx and AA7xxx aluminium alloys [J].

Chen, Y. ;

Pedersen, K. O. ;

Clausen, A. H. ;

Hopperstad, O. S. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2009, 523 (1-2) :253-262

[7] Evolution of microstructure and mechanical properties in naturally aged 7050 and 7075 Al friction stir welds [J].

Fuller, Christian B. ;

Mahoney, Murray W. ;

Calabrese, Mike ;

Micona, Leanna .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2010, 527 (09) :2233-2240

[8]

Hatch JohnE., 1984, Aluminum: properties and physical metallurgy, V1

[9] Microstructure and mechanical properties of AA7075(T6) hybrid laser/GMA welds [J].

Hu, B. ;

Richardson, I. M. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 459 (1-2) :94-100

[10]

Hwang R. Y., 1998, SCRIPTA MATER, V38, P215

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