Influence of temper on the performance of a high-strength Al–Zn–Mg alloy sheet in the warm forming processing chain

2016 ◽  
Vol 231 ◽  
pp. 189-198 ◽  
Author(s):  
M. Kumar ◽  
N.G. Ross
Keyword(s):  
High Strength ◽  
Alloy Sheet ◽  
Warm Forming ◽  
Mg Alloy ◽  
Processing Chain

Effects of Surface Strength and Temperature on Warm Forming of MG-AL-SUS Clad Sheet

2010 ◽  
Vol 443 ◽  
pp. 183-188
Author(s):  
Young Seon Lee ◽  
Taek Woo Jung ◽  
Dae Yong Kim ◽  
Young Hoon Moon
Keyword(s):  
Elevated Temperatures ◽  
Interface Strength ◽  
Alloy Sheet ◽  
Warm Forming ◽  
Mg Alloy ◽  
Uniaxial Tensile ◽  
Al Alloy ◽  
Essential Property ◽  
Drawing Ratio ◽  
Clad Sheet

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.

MECHANICAL PROPERTIES OF HIGH STRENGTH Al-Mg ALLOY SHEET

2009 ◽  
Vol 23 (06n07) ◽  
pp. 843-848 ◽  
Author(s):  
BONG-JAE CHOI ◽  
KYUNG-EUI HONG ◽  
YOUNG-JIG KIM
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Alloy Sheet ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Mg Alloy ◽  
Al Alloy ◽  
Calphad Approach ◽  
Automotive Body ◽  
Al Mg Alloys

The aim of this research is to develop the high strength Al alloy sheet for the automotive body. For the fabrication Al - Mg alloy sheet, the composition of alloying elements was designed by the properties database and CALPHAD (Calculation Phase Diagram) approach which can predict the phases during solidification using thermodynamic database. Al - Mg alloys were designed using CALPHAD approach according to the high content of Mg with minor alloying elements. After phase predictions by CALPHAD, designed Al - Mg alloys were manufactured. Addition of Mg in Al melts were protected by dry air/Sulphur hexafluoride (SF6) mixture gas which can control the severe Mg ignition and oxidation. After rolling procedure of manufactured Al - Mg alloys, mechanical properties were examined with the variation of the heat treatment conditions.

Microstructure and Mechanical Properties of Mg Alloy Sheets Produced by Twin Roll Caster

2007 ◽  
Vol 539-543 ◽  
pp. 1747-1752 ◽  
Author(s):  
Kunio Matsuzaki ◽  
Kanichi Hatsukano ◽  
Y. Torisaka ◽  
Kotaro Hanada ◽  
Toru Shimizu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cast Alloy ◽  
High Strength ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Drawing Ratio ◽  
Average Grain Size ◽  
Fine Microstructure ◽  
Twin Roll Caster ◽  
Twin Roll

Mg-Al-Zn alloys containing 0.5% Ca were strip cast into sheets with a thickness of about 1.0mm by twin roll caster. It is found that the addition of Ca to Mg95Al5-XZnX (wt%)alloys prevents the oxidation and burning of molten, and makes the melting and casting easy. The as-cast Mg96Al4Zn0.5Ca0.5 alloy sheet has few cracks at the edge. With increasing Zn content, the generation of cracks occurs more markedly. The as-cast alloys have equiaxed grains with an average grain size of 10 μm. A fine microstructure is obtained. All the samples consist of single hcp-Mg phase. The yield and ultimate tensile strength of the as-cast sheets are in the range of 180 to 200 MPa and 265 to 275 MPa, respectively. The alloy Mg95Al2Zn2.5Ca0.5 shows an elongation of 21% as well as a high strength of 275 MPa. The annealing at 400 °C causes an improvement of elongation to 24% and 30% for Mg96Al4Zn0.5Ca0.5 and Mg95Al2Zn2.5Ca0.5,respectively. A further enhancement of mechanical properties is expected by an appropriate thermomechanical treatment. The as-cast Mg96Al4Zn0.5Ca0.5 sheet was deep drawn at 250°C and a drawing ratio of 2.0 without cracking . In summery, the Ca added Mg alloys are suitable for the production of Mg alloy sheets by strip casting and the cast alloy sheet have high strength with ductility and good formability

scholarly journals Mechanical clinching and self-pierce riveting for sheet combination of 780-MPa high-strength steel and aluminium alloy A5052 sheets and durability on salt spray test of joints

2021 ◽  
Vol 113 (1-2) ◽  
pp. 59-72
Author(s):  
Yohei Abe ◽  
Ken-ichiro Mori
Keyword(s):  
Aluminium Alloy ◽  
High Strength Steel ◽  
Salt Spray ◽  
High Strength ◽  
Alloy Sheet ◽  
Galvanized Steel ◽  
Load Reduction ◽  
Minimum Thickness ◽  
Steel Sheets ◽  
Mechanical Clinching

AbstractTo increase the usage of high-strength steel and aluminium alloy sheets for lightweight automobile body panels, the joinability of sheet combinations including a 780-MPa high-strength steel and an aluminium alloy A5052 sheets by mechanical clinching and self-pierce riveting was investigated for different tool shapes in an experiment. All the sheet combinations except for the two steel sheets by self-pierce riveting, i.e., the two steel sheets, the two aluminium alloy sheets, and the steel-aluminium alloy sheets, were successfully joined by both the joining methods without the gaps among the rivet and the sheets. Then, to show the durability of the joined sheets, the corrosion behaviour and the joint strength of the aged sheets by a salt spray test were measured. The corrosion and the load reduction of the clinched and the riveted two aluminium alloy sheets were little. The corrosion of the clinched two steel sheets without the galvanized layer progressed, and then the load after 1176 h decreased by 85%. In the clinched two galvanized steel sheets, the corrosion progress slowed down by 24%. In the clinched steel and aluminium alloy sheets, the thickness reduction occurred near the minimum thickness of the upper sheet and in the upper surface on the edge of the lower aluminium alloy sheet, whereas the top surface of the upper sheet and the upper surface of the lower sheet were mainly corroded in the riveted joint. The load reduction was caused by the two thickness reductions, i.e., the reduction in the minimum thickness of the upper sheet and the reduction in the flange of the aluminium alloy sheet. Although the load of the clinched steel without the galvanized coating layer and aluminium alloy sheets decreased by about 20%, the use of the galvanized steel sheet brought the decrease by about 11%. It was found that the use of the galvanized steel sheets is effective for the decrease of strength reduction due to corrosion.

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