Unprecedented Age-Hardening and its Structural Requirement in a Severely Deformed Al-Cu-Mg Alloy

2021 ◽  
Author(s):  
Ran Yang ◽  
Zongqiang Feng ◽  
Tianlin Huang ◽  
Guilin Wu ◽  
Andrew Godfrey ◽  
...  
Keyword(s):  
Mg Alloy ◽  
Age Hardening ◽  
Structural Requirement

scholarly journals Unprecedented age-hardening and its structural requirement in a severely deformed Al-Cu-Mg alloy

2022 ◽  
Vol 206 ◽  
pp. 114240
Author(s):  
Ran Yang ◽  
Zongqiang Feng ◽  
Tianlin Huang ◽  
Guilin Wu ◽  
Andrew Godfrey ◽  
...  
Keyword(s):  
Mg Alloy ◽  
Age Hardening ◽  
Structural Requirement

Computational design and development of novel Al-Mg-Sc-Cr alloy

2015 ◽  
Vol 11 (3) ◽  
pp. 401-412 ◽  
Author(s):  
Abhijit Patra ◽  
Subhas Ganguly ◽  
Partha Protim Chattopadhyay ◽  
Shubhabrata Datta
Keyword(s):  
Genetic Algorithm ◽  
Mg Alloy ◽  
Age Hardening ◽  
Pareto Solutions ◽  
Content Type ◽  
Multi Objective ◽  
Hardening Effect ◽  
Ann Models ◽  
Strength And Ductility ◽  
Alloy Systems

Purpose – The purpose of this paper is to design and develop precipitation hardened Al-Mg alloy imparting enhanced strength with acceptable ductility through minor addition of Sc and Cr by using multi-objective genetic algorithm-based searching. In earlier attempts of strengthening aluminum alloys, owing to the formation of Al3Sc and Al7Cr phase, addition of Sc and Cr have yielded attractive precipitation hardening, respectively. Both the Al-Sc and Al-Cr system are quench sensitive due to presence of a sloping solvus in their phase diagrams. It is also known that both the Al3Sc and Al7Cr phases nucleate directly from the supersaturated solid solution without formation of GP-zones or transient phases prior to the formation of the Al3Sc and Al7Cr. Sc also found to have beneficial effect on the corrosion property of such alloys. In view of the above, it is of interest to explore the possibility of enhancing the age hardening effect in Al-Mg alloy by addition of Sc and Cr. Design/methodology/approach – The paper uses an approach where experimental information of two different alloy systems (namely, Al-Mg-Sc and Al-Cr) has been combined to generate a single database involving the potential features of both the systems with the aim to formulate the suitable artificial neural network (ANN) models for strength and ductility. The models are used as the objective functions for the optimization process. The patterns of the optimized Pareto front are analyzed to recognize the optimal property of the alloy system. The hitherto unexplored Al-Mg-Sc-Cr alloy, designed from the Pareto solutions and suitably modified on the basis of prior knowledge of the system, is then synthesized and characterized. Findings – The paper has demonstrated the ANN- and genetic algorithm (GA)-based design of a hitherto unexplored alloy by utilizing the existing information concerning the component alloy systems. The paper also established that analyses of the Pareto solutions generated through multi-objective optimization using GA provide an insight of the variation of the parameters at different combination of strength and ductility. It also revealed that the Al-Mg-Sc-Cr alloy has exhibited a two-stage age hardening effect. The first and second stages are due to the precipitation of Al3Sc and Al7Cr phases, respectively. Research limitations/implications – In the present study the two alloy systems are used in tandem to develop models to describe the properties involving the distinct mechanistic features of phase evolution inherent in both the systems. Though the ANN models having the capability to capture huge non-linearity of a system have been employed to predict the convoluted effects of those characteristics when an alloy containing Mg, Sc and Cr are added simultaneously, but the ANN models predictions can be checked experimentally by the future researchers. Practical implications – The paper demonstrates the role of scandium and chromium addition on the ageing characteristics of the alloy by analyzing the age hardening behavior of the designed alloy in cast and cold rolled condition clearly. Originality/value – The approach stated in this paper is a novel one, in the sense that experimental data of two different alloy systems have been clubbed to generate a single database with the aim to formulate the suitable ANN models for strength and ductility.

Age-hardening of an Al–Li–Cu–Mg alloy (2091) processed by high-pressure torsion

2012 ◽  
Vol 546 ◽  
pp. 82-89 ◽  
Author(s):  
Seungwon Lee ◽  
Zenji Horita ◽  
Shoichi Hirosawa ◽  
Kenji Matsuda
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Mg Alloy ◽  
Age Hardening

scholarly journals Evaluation of Age Hardening Behavior Using Composite Rule and Microstructure Observation in Al-Si-Mg Alloy Castings

2011 ◽  
Vol 52 (6) ◽  
pp. 1163-1167 ◽  
Author(s):  
Mitsuaki Furui ◽  
Tomoyuki Kitamura ◽  
Tatsuya Ishikawa ◽  
Susumu Ikeno ◽  
Seiji Saikawa ◽  
...  
Keyword(s):  
Mg Alloy ◽  
Age Hardening ◽  
Hardening Behavior ◽  
Microstructure Observation ◽  
Alloy Castings

Aging Behavior of Al-Li-Cu-Mg Alloy Processed by High-Pressure Torsion

2010 ◽  
Vol 654-656 ◽  
pp. 1243-1246 ◽  
Author(s):  
Seung Won Lee ◽  
Daichi Akama ◽  
Z. Horita ◽  
Tetsuya Masuda ◽  
Shoichi Hirosawa ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Rolling Process ◽  
Mg Alloy ◽  
Age Hardening ◽  
Subsequent Aging ◽  
Solid Solution Treatment ◽  
Conventional Rolling

This study presents an application of high-pressure torsion (HPT) to an Al-Li-Cu-Mg alloy (2091). The alloy was subjected to solid solution treatment at 505oC for 30 minutes and was processed by HPT under 6 GPa for 5 revolutions at room temperature. The hardness increased with straining and saturated to a constant level at 225 Hv. Aging was undertaken on the HPT-processed alloy at 100, 150 and 190oC for the total periods up to 9.3 days. The aging treatment led to a further increase in the hardness to ~275 Hv. It is shown that the simultaneous strengthening of the alloy due to grain refinement and age hardening was successfully achieved by application of HPT and subsequent aging treatment. The enhancement of the strength is prominent when compared with the application of a conventional rolling process.

Role of vacancy–solute complex in the initial rapid age hardening in an Al–Cu–Mg alloy

2001 ◽  
Vol 49 (5) ◽  
pp. 913-920 ◽  
Author(s):  
Y Nagai ◽  
M Murayama ◽  
Z Tang ◽  
T Nonaka ◽  
K Hono ◽  
...  
Keyword(s):  
Mg Alloy ◽  
Age Hardening

Spark plasma sintering and age hardening of an Al–Zn–Mg alloy powder blend

2016 ◽  
Vol 650 ◽  
pp. 129-138 ◽  
Author(s):  
S. Rudinsky ◽  
P. Hendrickx ◽  
D.P. Bishop ◽  
M. Brochu
Keyword(s):  
Spark Plasma Sintering ◽  
Alloy Powder ◽  
Mg Alloy ◽  
Age Hardening ◽  
Powder Blend ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Age-hardening behavior of Al–10%Si–0.3%Mg alloy with water quenching and direct quenching after solution treatment

2015 ◽  
Vol 65 (6) ◽  
pp. 218-223 ◽  
Author(s):  
Seiji Saikawa ◽  
Ryuichi Morioka ◽  
Kenji Matsuda ◽  
Susumu Ikeno ◽  
Emi Yanagihara ◽  
...  
Keyword(s):  
Solution Treatment ◽  
Water Quenching ◽  
Mg Alloy ◽  
Age Hardening ◽  
Direct Quenching ◽  
Hardening Behavior
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