Nanomechanical properties of friction stir welded AA6082-T6 aluminum alloy

被引：35

作者：

Kounnoulos, E. P. ^{[1
]}

Charitidis, C. A. ^{[1
]}

Daniolos, N. M. ^{[2
]}

Pantelis, D. I. ^{[2
]}

机构：

[1] Natl Tech Univ Athens, Dept Chem Engn Heroon 9, GR-15780 Athens, Greece

[2] Natl Tech Univ Athens, Dept Naval Architecture & Marine Engn Heroon 9, GR-15780 Athens, Greece

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2011年 / 176卷 / 19期

关键词：

Friction stir welding; Nanoindentation; Aluminum alloy; Nanohardness; Elastic modulus; Plasticity; INDENTATION EXPERIMENTS; SENSING INDENTATION; NANOINDENTATION; HARDNESS; TRANSITION; CRYSTALS; LOAD; TIP;

D O I：

10.1016/j.mseb.2011.01.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Lightweight alloys are of major concern, due to their functionality and applications in transport and industry applications. Friction stir welding (FSW) is a solid-state welding process for joining aluminum and other metallic alloys and has been employed in aerospace, rail, automotive and marine industries. Compared to the conventional welding techniques, FSW produces joints which do not exhibit defects caused by melting. The objective of the present study is to investigate the surface hardness (H) and elastic modulus (E) in friction stir welded aluminum alloy AA6082-T6. The findings of the present study reveal that the welding process softens the material, since the weld nugget is the region where the most deformations are recorded (dynamic recrystallization, production of an extremely fine, equiaxial structure), confirmed by optical microscopy and reduced nanomechanical properties in the welding zone. A yield-type pop-in occurs upon low loading and represents the start of phase transformation, which is monitored through a gradual slope change of the load-displacement curve. Significant pile-up is recorded during nanoindentation of the alloy through SPM imaging. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：1585 / 1589

页数：5

共 30 条

[1]

ADAMS MJ, 2001, MATER RES SOC S P, V649, P1

[2] Non-linear deformation mechanisms during nanoindentation [J].

Bahr, DF ;

Kramer, DE ;

Gerberich, WW .

ACTA MATERIALIA, 1998, 46 (10) :3605-3617

[3] Influence of indenter tip geometry on elastic deformation during nanoindentation [J].

Bei, H ;

George, EP ;

Hay, JL ;

Pharr, GM .

PHYSICAL REVIEW LETTERS, 2005, 95 (04)

[4]

Charitidis C A, 2010, INT J SURF IN PRESS

[5]

CHARITIDIS CA, 2010, MET HAR MAT, V28, P51

[6]

CHIONOPOULOS SK, 2009, INT C INT MAR ASS ME, P429

[7] Time-dependent characteristics of incipient plasticity in nanoindentation of a Ni3Al single crystal [J].

Chiu, YL ;

Ngan, AHW .

ACTA MATERIALIA, 2002, 50 (06) :1599-1611

[8] Adhesion interaction between atomically defined tip and sample [J].

Cross, G ;

Schirmeisen, A ;

Stalder, A ;

Grutter, P ;

Tschudy, M ;

Durig, U .

PHYSICAL REVIEW LETTERS, 1998, 80 (21) :4685-4688

[9] Effects of creep and thermal drift on modulus measurement using depth-sensing indentation [J].

Feng, G ;

Ngan, AHW .

JOURNAL OF MATERIALS RESEARCH, 2002, 17 (03) :660-668

[10] Pop-in phenomenon in MgO and LiF: observation of dislocation structures [J].

Gaillard, Y ;

Tromas, C ;

Woirgard, J .

PHILOSOPHICAL MAGAZINE LETTERS, 2003, 83 (09) :553-561

← 1 2 3 →