Strength, grain refinement and solute nanostructures of an Al-Mg-Si alloy (AA6060) processed by high-pressure torsion

被引：126
作者：
Sha, G. [1 ]
Tugcu, K. [1 ]
Liao, X. Z. [1 ]
Trimby, P. W. [2 ]
Murashkin, M. Y. [3 ]
Valiev, R. Z. [3 ,4 ]
Ringer, S. P. [1 ,2 ]
机构：
[1] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia
[2] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia
[3] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia
[4] St Petersburg State Univ, Lab Mech Severe Plast Deformat, St Petersburg 198504, Russia
来源：
ACTA MATERIALIA | 2014年 / 63卷
基金：
澳大利亚研究理事会;
关键词：
Solute nanostructures; Strength; Grain refinement; Al alloy; HPT; MECHANICAL-PROPERTIES; PRECIPITATION; BOUNDARIES; MICROSTRUCTURE; DEFORMATION;
D O I：
10.1016/j.actamat.2013.10.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of high-pressure torsion (HPT) processing on an Al-Mg-Si alloy (AA6060) have been investigated comprehensively. We show that the processing temperature has complex effects on the strength, grain refinement and solute nanostructures of the alloy. Ten-revolution HPT processing at room temperature produced the highest yield strength of 475 MPa, which is similar to a high-strength Al alloy. However, processing at 100 degrees C produced the finest grains due to the strong solute segregation to grain boundaries and the formation of high-density precipitates that pin grain boundaries. Processing at 180 degrees C led to significant decomposition of the alloy and the formation of coarse precipitates. This research demonstrates that solute nanostructures provide key information for unravelling the origins of HPT-induced strengthening and grain refinement, and reveals the important opportunities for "engineering" solute nanostructures to enhance grain refinement in HPT processing. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：169 / 179
页数：11
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