Fabrication Optimization of Magnesium Az61 Alloys via Extrusion for High Productivity

2011 ◽  
Vol 378-379 ◽  
pp. 727-730
Author(s):  
Joon Sik Park ◽  
Jeong Min Kim ◽  
Young Ho Song ◽  
Byung Hwan-Hong ◽  
Ye Won Cho ◽  
...  
Keyword(s):  
High Strength ◽  
Alloy System ◽  
Mg Alloys ◽  
Practical Application ◽  
Extrusion Speed ◽  
Surface Stability ◽  
High Productivity ◽  
Specific Strength ◽  
High Specific Strength ◽  
Structural Parts

The nature of high specific strength compared with other structural materials has led to wide application of Mg alloys. However, Mg alloys often exhibit relatively low strength and/or low surface stability, which can limit the practical application of the alloy system. In order to achieve high strength, the commercial AZ61 alloys were extruded, so that the application of the alloy system can be extended towards new structural parts for requiring the light nature of the alloy system. In this study, a high temperature extrusion has been carried out for the commercial Mg alloys (AZ61). The productivity and mechanical properties of the alloy were critically affected by the extrusion conditions such as temperature, extrusion ratio and extrusion speed. The texture development and alloy strengths with respect to the extrusion conditions have been discussed in terms of microstructural observations and phase analyses.

Mechanical Behaviors and Texture Development of the Extruded Magnesium AZ31 Alloys

2011 ◽  
Vol 695 ◽  
pp. 275-278
Author(s):  
Joon Sik Park ◽  
Jeong Min Kim ◽  
Young Ho Song ◽  
Dong Wook Lim ◽  
Won Seok Yang ◽  
...  
Keyword(s):  
Alloy System ◽  
Mg Alloys ◽  
Texture Development ◽  
Practical Application ◽  
Surface Stability ◽  
Specific Strength ◽  
Magnesium Az31 ◽  
Alloy Strength ◽  
Structural Parts ◽  
Strength And Ductility

Mg alloys are one attractive material in applications of transportations and mobile electronics due to their high specific strength compared with other structural materials. However, Mg alloys often exhibit relatively low strength and/or low surface stability, which can limit the practical application of the alloy system. In this perspective, thermo-mechanical treatments of the alloy can give enhanced materials strength, so that the application of the alloy system can be extended towards new structural parts for requiring the light nature of the alloy system. In this study, a high temperature extrusion has been carried out for the commercial Mg alloys (AZ31). The extrusion temperature and extrusion ratio critically affected the alloy strength and ductility. The texture development and alloy strengths with respect to the extrusion conditions have been discussed in terms of microstructural observations and phase analyses.

scholarly journals Accelerated discovery of high-strength aluminum alloys by machine learning

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Jiaheng Li ◽  
Yingbo Zhang ◽  
Xinyu Cao ◽  
Qi Zeng ◽  
Ye Zhuang ◽  
...  
Keyword(s):  
Machine Learning ◽  
Aluminum Alloys ◽  
Mechanical Performance ◽  
High Strength ◽  
Cost Effective ◽  
Alloy System ◽  
Processing Route ◽  
Specific Strength ◽  
Cu Alloy ◽  
High Strength Aluminum Alloys

Abstract Aluminum alloys are attractive for a number of applications due to their high specific strength, and developing new compositions is a major goal in the structural materials community. Here, we investigate the Al-Zn-Mg-Cu alloy system (7xxx series) by machine learning-based composition and process optimization. The discovered optimized alloy is compositionally lean with a high ultimate tensile strength of 952 MPa and 6.3% elongation following a cost-effective processing route. We find that the Al8Cu4Y phase in wrought 7xxx-T6 alloys exists in the form of a nanoscale network structure along sub-grain boundaries besides the common irregular-shaped particles. Our study demonstrates the feasibility of using machine learning to search for 7xxx alloys with good mechanical performance.

Blechkomponenten aus hochfestem Aluminium*/Sheet metal components made of high-strength aluminium

2018 ◽  
Vol 108 (10) ◽  
pp. 639-645
Author(s):  
P. Groche ◽  
J. Günzel ◽  
T. Suckow
Keyword(s):  
Heat Treatment ◽  
Sheet Metal ◽  
Construction Material ◽  
High Strength ◽  
Process Chain ◽  
Lightweight Construction ◽  
Forming Process ◽  
Specific Strength ◽  
Treatment Processes ◽  
High Specific Strength

Zur Ausnutzung der hohen spezifischen Festigkeit und folglich Eignung als Leichtbauwerkstoff von EN AW-7075 bedarf es neben den Umform- auch Wärmebehandlungsprozessen, die im Folgenden in den Umformprozess integriert werden und die Prozesskette somit deutlich kürzer und effizienter gestalten. Dieser Fachbeitrag zeigt, welches Produktivitäts- und Leichtbaupotenzial durch eine Inline-Wärmebehandlung erschlossen werden kann.   To be able to exploit the high specific strength and thus suitability of EN AW-7075 as a lightweight construction material, it requires not only forming but also heat treatment processes. The latter become integrated into the forming process and thus make the process chain significantly shorter and more efficient. This paper points out the potential for productivity and lightweight construction to be tapped by inline heat treatment.

Mechanical behavior of laminated bamboo lumber dowel-type connection

2019 ◽  
Vol 23 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Jiannan Li ◽  
Aiping Zhou
Keyword(s):  
Rectangular Cross Section ◽  
High Strength ◽  
Strength Properties ◽  
Loading Capacity ◽  
Yield Model ◽  
Specific Strength ◽  
High Specific Strength ◽  
Laminated Bamboo ◽  
Theoretical Results ◽  
Laminated Bamboo Lumber

Bamboo is a kind of green material with high specific strength, while the hollow tubular structure makes it rather hard to be utilized in structure. Glue and hot-pressing processes make laminated bamboo lumber rectangular cross section and with high strength properties. The dowel-type connection can be used in I-joist instead of the costly adhesive, while the behaviors of which are extremely complicated. European yield model is confirmed to be an effective method to estimate loading capacity of connection and is adopted by various standard and design codes. This article focused on a kind of connection innovatively with laminated bamboo lumber dowel. The embedment tests were carried out to study the embedment strength of laminated bamboo lumber members. Connection tests under lateral load were conducted to investigate the performance and loading capacity. Finally, theoretical results determined by design rules in current codes were compared with experimental results

Investigation and Application of Excellent Performance Mg Rare Earth Alloys as a Structural Material

2007 ◽  
Vol 539-543 ◽  
pp. 1719-1722 ◽  
Author(s):  
Li Min Wang ◽  
Qiu Ming Peng ◽  
Jie Yang ◽  
Da Qing Fang ◽  
Yao Ming Wu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Structural Material ◽  
Creep Resistance ◽  
Mg Alloys ◽  
Rare Earth Alloys ◽  
Excellent Performance ◽  
Specific Strength ◽  
High Specific Strength ◽  
Transmission Case ◽  
Re Elements

Magnesium (Mg) alloys are becoming one of the key engineering materials for aerospace and automotive industries because of their low density, high specific strength, excellent machinability and good diecastability, etc. In the meantime, conventional Mg alloys are limited for their low strength and creep resistance. Therefore, special attention is given on its applications at high temperature such as the transmission case and the engine block, In the near decades, much effort have been devoted to improving the properties such as strength, ductility, creep resistance of Mg alloys by adding rare earth (RE) elements, and it has been certified that the addition of RE do improve the performances of the Mg alloys. In this paper, we will review the progresses in the investigations of the Mg-RE alloys as a structural material, and also propose its application prospect in future.

scholarly journals Interpretation of Specific Strength-Over-Resistivity Ratio in Cu Alloys

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7150
Author(s):  
Hongming Li ◽  
Shuang Zhang ◽  
Yajun Zhao ◽  
Xiaona Li ◽  
Fushi Jiang ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Lower Limit ◽  
High Strength ◽  
Alloy System ◽  
Resistivity Ratio ◽  
Specific Strength ◽  
Cu Alloys ◽  
The Matrix ◽  
In Series ◽  
Pure Cu

Reaching simultaneously high mechanical strength and low electrical resistivity is difficult as both properties are based on similar microstructural mechanisms. In our previous work, a new parameter, the tensile strength-over-electrical resistivity ratio, is proposed to evaluate the matching of the two properties in Cu alloys. A specific ratio of 310 × 108 MPa·Ω−1·m−1, independent of the alloy system and thermal history, is obtained from Cu-Ni-Mo alloys, which actually points to the lower limit of prevailing Cu alloys possessing high strength and low resistivity. The present paper explores the origin of this specific ratio by introducing the dual-phase mechanical model of composite materials, assuming that the precipitate particles are mechanically mixed in the Cu solid solution matrix. The strength and resistivity of an alloy are respectively in series and parallel connections to those of the matrix and the precipitate. After ideally matching the contributions from the matrix and the precipitate, the alloy should at least reach half of the resistivity of pure Cu, i.e., 50%IACS, which is the lower limit for industrially accepted highly conductive Cu alloys. Under this condition, the specific 310 ratio is related to the precipitate-over-matrix ratios for strength and resistivity, which are both two times those of pure Cu.

Mechanical Properties of Al2O3 Reinforced Cast and Hot Extruded Al Based Metal Matrix Composites

2015 ◽  
Vol 813-814 ◽  
pp. 208-212
Author(s):  
S. Ghanaraja ◽  
K.L. Vinuth Kumar ◽  
K.S. Ravikumar ◽  
B.M. Madhusudan
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Base Alloy ◽  
High Strength ◽  
Matrix Composites ◽  
Specific Strength ◽  
Good Corrosion Resistance ◽  
High Specific Strength ◽  
Low Weight

The Synthesis of aluminium matrix composites is receiving considerable emphasis in meeting the requirements of various industries. Due to the desired properties such as low weight, high specific strength, good corrosion resistance and excellent wear resistance, they have received a great interest in the recent years. Metal-matrix composites (MMCs) based on aluminium and magnesium has emerged as an important class of materials and Al2O3can be considered as ideal reinforcements, due to their high strength, high aspect ratio and thermo-mechanical properties. The objective of this work is to reinforce Al 1100-Mg alloy with different wt% of Al2O3(0, 3, 6, 9 and 12) was added by melt stirring method and Extrusion is carried out (extrusion ratio of 12.25) for the same alloy and composites. Mechanical property like hardness and tensile properties have been investigated for cast and extruded of base alloy and composites.

Umformung von höchstfesten Aluminiumlegierungen*/Forming of high-strength aluminum alloys - Influence of the forming temperature on the formability of 7xxx-aluminum alloys

2017 ◽  
Vol 107 (10) ◽  
pp. 695-699
Author(s):  
B.-A. Prof. Behrens ◽  
S. Hübner ◽  
H. Vogt
Keyword(s):  
Aluminum Alloys ◽  
Room Temperature ◽  
High Strength ◽  
Eine Hohe ◽  
Specific Strength ◽  
Automotive Body ◽  
High Specific Strength ◽  
Body Construction ◽  
Forming Temperature ◽  
High Strength Aluminum Alloys

Der Fachartikel befasst sich mit der Umformbarkeit von höchstfesten Aluminiumlegierungen der 7xxx-Reihe. Diese haben eine hohe spezifische Festigkeit, weshalb sie ein großes Leichtbaupotenzial besitzen. Eine Umformung bei Raumtemperatur ist allerdings nur bedingt möglich und somit ein Einsatz im Automobilkarosseriebau derzeit kaum umsetzbar. Daher werden für diese Legierungen verschiedene Prozessrouten untersucht, welche durch Erwärmung der Platinen und Werkzeuge die Umformbarkeit verbessern.   This study deals with the formability of high-strength aluminum alloys of the 7xxx-series. These alloys have a high specific strength and, therefore, a high lightweight potential. A limited formability at room temperature of these alloys, however, limits the use in automotive body construction. To increase the formability there are different approaches. In this study, the influence of the blank as well as the forming tool temperature is investigated.

scholarly journals Development of a High Strength Magnesium Alloy for Wire Arc Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 778
Author(s):  
Stefan Gneiger ◽  
Johannes A. Österreicher ◽  
Aurel R. Arnoldt ◽  
Alois Birgmann ◽  
Martin Fehlbier
Keyword(s):  
Additive Manufacturing ◽  
Magnesium Alloys ◽  
High Strength ◽  
Manufacturing Processes ◽  
Rare Earth Alloy ◽  
Specific Strength ◽  
High Specific Strength ◽  
Material Utilization ◽  
Wire Arc Additive Manufacturing ◽  
Specific Part

Due to their high specific strength, magnesium alloys are promising materials for further lightweighting in mobility applications. In contrast to casting and forming processes, additive manufacturing methods allow high degrees of geometrical freedom and can generate significant weight reductions due to load-specific part design. In wire arc additive manufacturing processes, large parts can be produced with high material utilization. Process-inherent high melt temperatures and solidification rates allow for the use of magnesium alloys which are otherwise complicated to process; this enables the use of unconventional alloying systems. Here, we report the development of a Mg-Al-Zn-Ca-rare earth alloy for wire arc additive manufacturing (WAAM). Compared to parts made of commercially available filler wire, the newly developed alloy achieves a higher strength (approx. +9 MPa yield strength, +25 MPa ultimate tensile strength) in WAAM.

Influence of Rare Earth Elements in Magnesium Alloy - A Mini Review

2020 ◽  
Vol 979 ◽  
pp. 162-166
Author(s):  
N. Sivashanmugam ◽  
K. L. Harikrishna
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Biomedical Applications ◽  
High Strength ◽  
Alloy System ◽  
Damping Capacity ◽  
Specific Strength ◽  
Large Size ◽  
Strength And Ductility

In recent days, the use of Magnesium and its alloys is preferred in defence, automotive and aerospace industries where large size and complex components are required in light weight. Besides, magnesium alloys are used in computers, electronic devices and biomedical applications. Alloying magnesium with rare earth elements (RE) is used to develop the light alloys for the stated applications at elevated temperature. Rare earth magnesium alloys are having unique properties over other metals, including a high specific strength, low thermal conductivity, good damping capacity and good castability. In this review article, the recent development of rare earth magnesium alloys will be reviewed from the view point of novel alloying designs. It has been revealed that in ternary alloy system Mg-ZN-RE alloy exhibited high strength and ductility. This leads the researchers to investigate Mg-ZN-RE alloy recently.

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