Forming Al and Mg Alloy Sheet and Tube at Elevated Temperatures

Clad metal sheets are composed of one or more different materials joined by resistance seam welding, roll-bonding process, etc. Good formability is an essential property in order to deform a clad metal sheet to a part or component. Temperature is one of the major factors affected the interface strength and formability on warm forming of multilayered sheet metal. In this study, the mechanical properties and formability of a Mg-Al-SUS clad sheet are investigated. The clad sheet was deformed at elevated temperatures because of its poor formability at room temperature. Tensile tests were performed at various temperatures above 250°C and at various strain rates. The limit drawing ratio (LDR) was obtained using a deep drawing test to measure the formability of the clad sheet. Interface strength and fracture pattern were changed mainly by temperature. Uniaxial tensile strength represents entirely different type below and above 200°C at also different strain rate. Mg alloy sheet was fractured earlier more than SUS and Al alloy sheet below 250°C testing temperature. On the contrary, Mg alloy sheet was elongated much more than other metals above 250°C.

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Tensile Ductility of Al-Mg Alloy Sheet at Elevated Temperatures

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.5.1 ◽

1984 ◽

Vol 5 ◽

pp. 1-18

Author(s):

F.A. Shehata

Keyword(s):

Elevated Temperatures ◽

Tensile Ductility ◽

Alloy Sheet ◽

Mg Alloy

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Incremental forming of Mg alloy sheet at elevated temperatures

Journal of Mechanical Science and Technology ◽

10.1007/bf03177368 ◽

2007 ◽

Vol 21 (10) ◽

pp. 1518-1522 ◽

Cited By ~ 16

Author(s):

S. W. Kim ◽

Y. S. Lee ◽

S. H. Kang ◽

J. H. Lee

Keyword(s):

Elevated Temperatures ◽

Incremental Forming ◽

Alloy Sheet ◽

Mg Alloy

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The effect of homogenization on the recrystallization of an Al-Mn-Mg alloy sheet

Journal of Materials Science ◽

10.1007/s10853-005-6929-x ◽

2005 ◽

Vol 40 (5) ◽

pp. 1135-1139 ◽

Cited By ~ 3

Author(s):

M. Aghaie-Khafri

Keyword(s):

Alloy Sheet ◽

Mg Alloy

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Microstructure Evolution and Mechanical Properties of an Al-Cu-Mg Alloy at Elevated Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.148 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 148-153

Author(s):

Min Hao ◽

Ji Gang Ru ◽

Ming Liu ◽

Kun Zhang ◽

Liang Wang ◽

...

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Elevated Temperature ◽

Elevated Temperatures ◽

Shear Fracture ◽

S Phase ◽

Mg Alloy ◽

Transmission Electron ◽

Fracture Features ◽

Scanning Electron

Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized to study the microstructure and mechanical behavior of an Al-Cu-Mg alloy after tensile test at 125°C, 150°C, 175°C and 200 °C, respectively. The yield strength and ultimate tensile strength decreased with the increase of temperature, while the elongation increased firstly and then decreased. The S and S′ precipitate after tension at elevated temperatures. When the temperature was higher than 175°C, the precipitate coarsens rapidly. The alloys displayed a shear fracture features at elevated temperature. The larger S′ and S phase coarsened and dropped which forming crack in the grain boundaries and precipitate interfaces, resulting in the decrease of the elongation of the alloy.

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Study on the Formability of Aluminium Alloy Sheets at Room and Elevated Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.877.393 ◽

2016 ◽

Vol 877 ◽

pp. 393-399

Author(s):

Jia Zhou ◽

Jun Ping Zhang ◽

Ming Tu Ma

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Elevated Temperature ◽

Aluminium Alloy ◽

Aluminium Alloys ◽

Elevated Temperatures ◽

Hot Stamping ◽

Natural Aging ◽

Alloy Sheet ◽

Aluminum Alloy Sheet

This paper presents the main achievements of a research project aimed at investigating the applicability of the hot stamping technology to non heat treatable aluminium alloys of the 5052 H32 and heat treatable aluminium alloys of the 6016 T4P after six months natural aging. The formability and mechanical properties of 5052 H32 and 6016 T4P aluminum alloy sheets after six months natural aging under different temperature conditions were studied, the processing characteristics and potential of the two aluminium alloy at room and elevated temperature were investigated. The results indicated that the 6016 aluminum alloy sheet exhibit better mechanical properties at room temperature. 5052 H32 aluminum alloy sheet shows better formability at elevated temperature, and it has higher potential to increase formability by raising the temperature.

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Improved Formability and Deep Drawing of Cross-Rolled Magnesium Alloy Sheets at Elevated Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.488-489.461 ◽

2005 ◽

Vol 488-489 ◽

pp. 461-464 ◽

Cited By ~ 1

Author(s):

Yong Chao Xu ◽

Shi Hong Zhang ◽

H.M. Liu ◽

Z.T. Wang ◽

W.T. Zheng ◽

...

Keyword(s):

Magnesium Alloy ◽

Deep Drawing ◽

Elevated Temperatures ◽

Rolling Direction ◽

Alloy Sheet ◽

Rolled Sheet ◽

Drawing Ratio ◽

Cross Rolling ◽

Magnesium Alloy Sheet ◽

Cylindrical Cup

The extruded sheets were prepared at the temperature between 350ıand 400ı, and the magnesium alloy sheet was manufactured by a new method, cross rolling, in which the rolling direction was changed in each pass. At the time, deep drawing of magnesium alloy sheet was investigated at elevated temperatures. The results show that the sheet has refined-grain by cross-rolling after it was annealed at 250ı, and the formability is significantly improved at lower temperatures, which is superior to the extruded sheet and the one-way rolled sheet. Deep drawing of magnesium alloy was performed successfully, and cylindrical cup of limited drawing ratio (LDR) 2.6 and 35 mm deep rectangular box (65ı50) was achieved at the lower temperature of 170ı. The different types of fracture were analyzed and reasonable parameters were determined.

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Determining the material model at elevated temperatures with different strain rates and simulating the warm forming process for Mg alloy AZ31B sheet

Science and Technology Development Journal ◽

10.32508/stdj.v18i2.1087 ◽

2015 ◽

Vol 18 (2) ◽

pp. 149-158

Author(s):

Thien Tich Truong ◽

Long Thanh Nguyen ◽

Binh Nguyen Thanh Vu ◽

Hien Thai Nguyen

Keyword(s):

Magnesium Alloy ◽

Constitutive Equations ◽

Elevated Temperatures ◽

Material Model ◽

Alloy Sheet ◽

Strain Rates ◽

Functional Requirements ◽

Temperature Dependent ◽

Forming Process ◽

Az31b Alloy

Magnesium alloy is one of lightweight alloys has been studied more extensively today. Because weight reduction while maintaining functional requirements is one of the major goals in industries in order to save materials, energy and costs, etc. Its density is about 2/3 of aluminum and 1/4 of steel.The material used in this study is commercial AZ31B magnesium alloy sheet which includes 3% Al and 1% Zn. However, due to HCP (Hexagonal Close Packed) crystal structure, magnesium alloy has limited ductility and poor formability at room temperature. But its ductility and formability will be improved clearly at elevated temperature. From the data of tensile testing, the constitutive equations of AZ31B was approximated using the Ramgberg-Osgood model with temperature dependent parameters to fit in the experiment results in tensile test. Yield locus are also drawn in plane stress σ1- σ2 with different yield criteria such as Hill48, Drucker Prager, Logan Hosford, Y. W. Yoon 2013 and particular Barlat 2000 criteria with temperature dependent parameters. Applying these constitutive equations were determined at various temperatures and different strain rates, the finite element simulation stamping process for AZ31B alloy sheet by software PAM- STAMP 2G 2012, to verify the model materials and the constitutive equations.

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