Annealing Effects on Mechanical Properties and Microstructure of AZ31 Alloy Sheet Differential-Speed-Rolled at Low Temperatures

2007 ◽  
Vol 558-559 ◽  
pp. 213-216 ◽  
Author(s):  
Y.G. Jeong ◽  
Woo Jin Kim ◽  
Seo Gou Choi ◽  
Ha Guk Jeong
Keyword(s):  
Mechanical Properties ◽  
Tensile Elongation ◽  
Az31 Alloy ◽  
Alloy Sheet ◽  
Large Drop ◽  
High Anisotropy ◽  
Texture Change ◽  
Annealing Effects ◽  
Anisotropy Of Mechanical Properties ◽  
Differential Speed

For the Magnesium alloy AZ31, hot rolling is usually carried out in the temperature range between 250 and 400°C but the processed sheets usually exhibit high anisotropy in mechanical properties. In the current study, DSR process was found to be effective in improving anisotropy of mechanical properties and ductility at room temperature. Full recrystallization takes place from 200°C and above. A large drop of UTS occurs above 200°C where full recrystallization starts. Tensile elongation increases with annealing temperature but anisotropy degrades from 200°C onwards. Texture change during recrystallization is believed to be responsible for this result.

The Effect of Differential Speed Rolling on Microstructure and Mechanical Properties of an AZ31 Alloy Sheet

2006 ◽  
Vol 116-117 ◽  
pp. 235-238 ◽  
Author(s):  
Ha Guk Jeong ◽  
Y.G. Jeong ◽  
Duk Jae Yoon ◽  
Seo Gou Choi ◽  
Woo Jin Kim
Keyword(s):  
Mechanical Properties ◽  
Az31 Alloy ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Microstructure And Mechanical Properties ◽  
High Anisotropy ◽  
Az31 Sheet ◽  
Differential Speed Rolling ◽  
Conventional Rolling ◽  
Differential Speed

Magnesium alloy AZ31, which processed by conventional rolling or extrusion, has high anisotropy of mechanical properties in its strength and elongation at room temperature. We compared the influence of differential speed rolling with conventional rolling process on microstructure and mechanical properties of commercial AZ31 sheet. Commercial AZ31 alloy sheets were processed with conventional and differential speed rolled with thickness reduction ratio of 30% at a various temperature. The elongation of AZ31 alloy, warm-rolled by differential speed rolling is larger than rolled by conventional rolling. Besides, grain size and distribution on microstructure of the conventional rolling were coarsely(~30μm) and inhomogeneously but, that those of the differential speed rolling were fine(~13μm) and homogeneously.

Effect of Clock Rolling on Microstructures and Properties of AZ31 Magnesium Alloy Sheets

2011 ◽  
Vol 686 ◽  
pp. 40-45 ◽  
Author(s):  
Xin Huang ◽  
Guang Jie Huang ◽  
Dong Ping Xiao ◽  
Qing Liu
Keyword(s):  
Mechanical Properties ◽  
Az31 Alloy ◽  
Annealed Sample ◽  
Alloy Sheet ◽  
Basal Texture ◽  
Texture Measurement ◽  
Grain Sizes ◽  
Uniform Microstructure ◽  
Similar Texture ◽  
Anisotropy Of Mechanical Properties

In this paper, the influence of clock rolling（CR）on microstructure and texture as well as the anisotropic properties of AZ31 alloy sheet was systematically studied. Compared to unidirectional rolling（UR）, clock rolling leads to more uniform microstructure in annealed sample. The average grain sizes of the two kinds of sheet are similar. Texture measurement reveals that clock rolling can effectively weaken the intensity of basal texture and generate more symmetrical basal texture. Clock rolled samples exhibit weaker anisotropy of mechanical properties due to its lower basal texture intensities and more symmetrical basal texture in tensile test.

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ31 MAGNESIUM ALLOY SHEET BY HOT ROLLING

2009 ◽  
Vol 23 (06n07) ◽  
pp. 984-989 ◽  
Author(s):  
QING MIAO ◽  
LIANXI HU ◽  
ERDE WANG ◽  
SHUJIN LIANG ◽  
HONGYING CHAO
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Hot Rolling ◽  
Tensile Elongation ◽  
Rolling Direction ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Microstructure And Mechanical Properties ◽  
Roll Temperature

AZ31 magnesium alloy sheets with a thickness of about 2mm were prepared by using a unique hot rolling process which was featured by heating the rolls during rolling. Two different rolling routes were used to achieve the final thickness through 6 passes of rolling. The major rolling parameters were chosen as the same for both rolling routes except that the roll temperature was set to be 400°C for route A and the 1st to 4th passes of route B, but lowered to 350°C for the 5th and 6th passes of route B. The microstructure and mechanical properties of the alloy sheets were comparatively investigated. The results showed that dynamic recrystallization occurred during hot rolling, and by choosing the processing parameters appropriately the grain size could be refined steadily with increasing rolling passes. The final alloy sheet prepared by 6 passes of rolling via the rolling route B was featured by a very fine microstructure, with the grain size being 5μm in average. Correspondingly, it presented very high strength and tensile elongation, with its yield strength and tensile elongation achieving 206MPa and 26.4% in the transverse, and 196MPa and 27.6% in the rolling direction, respectively.

Mechanical Properties and Formability of AZ31 Magnesium Alloy Processed by Differential Speed Rolling

2007 ◽  
Vol 544-545 ◽  
pp. 395-398 ◽  
Author(s):  
Xin Sheng Huang ◽  
Kazutaka Suzuki ◽  
Akira Watazu ◽  
Ichinori Shigematsu ◽  
Naobumi Saito
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Rolling Plane ◽  
Alloy Sheet ◽  
Speed Ratio ◽  
Roll Speed ◽  
Proof Stress ◽  
Differential Speed Rolling ◽  
R Value ◽  
Differential Speed

An AZ31 (Mg-3Al-1Zn-0.35Mn in mass%) alloy sheet exhibiting the inclination of the basal plane from the rolling plane at about 15º, was fabricated by a DSR processing with a roll speed ratio of 1.167. Compared with the normal rolled sheets, the DSR processed sheets showed a lower 0.2% proof stress, a larger elongation, a smaller r-value and a larger n-value. The Erichsen value at room temperature significantly increased from 2.2 to 3.1, and the deep drawability also improved.

Effects of Differential Speed Rolling on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 1759-1763 ◽  
Author(s):  
Xin Sheng Huang ◽  
Kazutaka Suzuki ◽  
Yong Jai Kwon ◽  
Akira Watazu ◽  
Ichinori Shigematsu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Bands ◽  
Rolling Direction ◽  
Az31 Alloy ◽  
Speed Ratio ◽  
Rolled Sheet ◽  
Proof Stress ◽  
Tensile Direction ◽  
Differential Speed Rolling ◽  
Differential Speed

A differential speed rolling (DSR) processing with a roll speed ratio of 1.167 was carried out on an AZ31 alloy for investigating the effects of DSR on microstructure, texture and mechanical properties. The DSR processed sheet showed unidirectional shear bands with a small grain size of 5.5 μm inclining to the rolling direction, and the basal plane tended to incline at about 15º from the rolling plane toward the rolling direction. Compared with the normal rolled sheet, the DSR processed sheets showed a lower proof stress and a larger elongation with an increase from 21% to 26% in the rolling direction. The proof stress increased and the elongation decreased with the angle between the tensile direction and the rolling direction.

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