Effect of heat treatments on the microstructure of an ultrafine-grained Al-Zn-Mg alloy produced by powder metallurgy

被引：10
作者：
Queudet, H. [1 ,2 ,3 ]
Lemonnier, S. [1 ]
Barraud, E. [1 ]
Ghanbaja, J. [3 ]
Allain, N. [2 ]
Gaffet, E. [3 ]
机构：
[1] French German Res Inst St Louis, St Louis, France
[2] Univ Lorraine, Lab Microstruct Studies & Mech Mat, UMR CNRS 7239, Metz, France
[3] Univ Lorraine, UMR CNRS 7198, Inst Jean Lamour, Nancy, France
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 685卷
关键词：
Precipitation; Al alloy; Ultrafine grained materials; Guinier-Preston zones; Heat treatments; Transmission electron microscopy; SEVERE PLASTIC-DEFORMATION; CU ALLOY; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; BORON-CARBIDE; GP-ZONES; BEHAVIOR; PRECIPITATION;
D O I：
10.1016/j.msea.2016.12.109
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Previous study by Queudet et al. [1] showed that powder metallurgy allows to produce high strength ultrafine-grained (UFG) Al-Zn-Mg alloys which contains both eta' and eta phases. This present work investigates the effects of solid solution treatment followed by quenching (W temper) and subsequent ageing to obtain theoretical T6 tempered UFG material. TEM analyses revealed the presence of GP zones and metastable eta' phase in W tempered UFG material. Compared to as-fabricated material, quenching conferred to the alloy higher maximum stress of 785 MPa and stabilized plastic flow. Further ageing resulted in over-aged alloy containing the eta phase, inducing lower hardness and compressive stress. TEM observations showed that variant eta(2) which grows from eta' is delimited by previous GP-II zones.
引用
收藏
页码：71 / 78
页数：8
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