Microstructural evolution and aging behavior of cryorolled Al-4Zn-2Mg alloy

被引：56
作者：
Krishna, K. Gopala [1 ,4 ]
Sivaprasad, K. [2 ]
Venkateswarlu, K. [3 ]
Kumar, K. C. Hari [4 ]
机构：
[1] CSIR, Natl Met Lab, Madras Ctr, Madras 600113, Tamil Nadu, India
[2] Natl Inst Technol, Dept Met & Mat Engn, Tiruchirappalli 620015, Tamil Nadu, India
[3] CSIR, Natl Aerosp Labs, Bangalore 560017, Karnataka, India
[4] Indian Inst Technol, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 535卷
关键词：
Al-Zn-Mg alloy; Cryorolling; Ultrafine grain; Aging; Precipitation; ZN-MG ALLOY; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; CU ALLOY; AL-CU; TEMPERATURE; PRECIPITATION; TENSILE; ZONES; DEFORMATION;
D O I：
10.1016/j.msea.2011.12.052
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of cryorolling on microstructural evolution and aging characteristics of an Al-4Zn-2Mg alloy is investigated using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), electron back scattered diffraction (EBSD) and hardness measurements. The Al-4Zn-2Mg alloy in solutionized condition was cryorolled to achieve 70-90% deformation. The cryorolled samples were short annealed followed by three different aging treatments viz., natural aging, peak aging and over aging. The EBSD results suggest the presence of ultrafine grains in the cryorolled alloy. DSC thermograms and aging studies revealed that cryorolling enhances the aging kinetics of the alloy. The two-step peak aging treatment indicated that the degree of peak hardness is directly proportional to the extent of deformation and the time to attain it varied inversely with respect to the amount of deformation. TEM studies of cryorolled and peak aged (CRPA) samples showed large number of uniformly distributed, finer and closely spaced eta' strengthening precipitates when compared to bigger precipitates in coarse grain peak aged (CGPA) alloy. Variations in precipitate distribution and morphology between CRPA and ('CPA alloys are attributed to the stored energy and high density of dislocations generated during cryorolling. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：129 / 135
页数：7
相关论文
共 39 条
[1]   Accelerated artificial ageing regimes of commercial aluminium alloys. II: Al-Cu, Al-Zn-Mg-(Cu), Al-Mg-Si-(Cu) alloys [J].
Ber, LB .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2000, 280 (01) :91-96
[2]   GP-zones in Al-Zn-Mg alloys and their role in artificial aging [J].
Berg, LK ;
Gjonnes, J ;
Hansen, V ;
Li, XZ ;
Knutson-Wedel, M ;
Waterloo, G ;
Schryvers, D ;
Wallenberg, LR .
ACTA MATERIALIA, 2001, 49 (17) :3443-3451
[3]   The influence of cryoECAP on microstructure and property of commercial pure aluminum [J].
Chen, Yanbo ;
Li, Yinglong ;
He, Lizi ;
Lu, Cheng ;
Ding, Hua ;
Li, Qingyan .
MATERIALS LETTERS, 2008, 62 (17-18) :2821-2824
[4]   Tensile and impact-toughness behaviour of cryorolled Al 7075 alloy [J].
Das, P. ;
Jayaganthan, R. ;
Singh, I. V. .
MATERIALS & DESIGN, 2011, 32 (03) :1298-1305
[5]   Investigation of fine scale precipitates in Al-Zn-Mg alloys after various heat treatments [J].
Engdahl, T ;
Hansen, V ;
Warren, PJ ;
Stiller, K .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 327 (01) :59-64
[6]   Production of ultra-fine grain microstructures in Al-Mg alloys by coventional rolling [J].
Gholinia, A ;
Humphreys, F ;
Prangnell, PB .
ACTA MATERIALIA, 2002, 50 (18) :4461-4476
[7]   Precipitation sequences during quenching of the AA 7010 alloy [J].
Godard, D ;
Archambault, P ;
Aeby-Gautier, E ;
Lapasset, G .
ACTA MATERIALIA, 2002, 50 (09) :2319-2329
[8]   Characterization of precipitation and phase transformations in Al-Zn-Mg alloy by the differential dilatometry [J].
Hadjadj, L. ;
Amira, R. ;
Hamana, D. ;
Mosbah, A. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2008, 462 (1-2) :279-283
[9]   THE INFLUENCE OF MG CONTENT ON THE FORMATION AND REVERSION OF GUINIER-PRESTON ZONES IN AL-4.5 AT-PERCENT ZN-X MG ALLOYS [J].
HONYEK, G ;
KOVACS, I ;
LENDVAI, J ;
NGHUYSINH ;
UNGAR, T ;
LOFFLER, H ;
GERLACH, R .
JOURNAL OF MATERIALS SCIENCE, 1981, 16 (10) :2701-2709
[10]   Differential scanning calorimetry and electron diffraction investigation on low-temperature aging in Al-Zn-Mg alloys [J].
Jiang, XJ ;
Noble, B ;
Holme, B ;
Waterloo, G ;
Tafto, J .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2000, 31 (02) :339-348
1234