Quick Plastic Forming Behavior of AZ91 Magnesium Alloy Sheet

2011 ◽  
Vol 314-316 ◽  
pp. 842-846
Author(s):  
Gang Wang ◽  
Zhi Peng Zhang ◽  
Cheng Bo Liu ◽  
Xia Sheng
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Alloy Sheet ◽  
Gas Pressure ◽  
Test Results ◽  
Free Gas ◽  
Magnesium Alloy Sheet ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Bulging Test

The quick plastic forming (QPF) behavior for fine-grained AZ91D magnesium alloy sheet with the thickness of 1.0 mm and the grain size of 6.0 µm was investigated. Free gas bulging tests were conducted under different gas pressure for 300 s in the range of 250-400°C to investigate how the temperature and pressure impact on the formability of QPF. Free gas bulging test results show that the bulge height of semisphere part exist the peak value of 33 mm under the gas pressure of 0.5 MPa at 400°C. QPF tests of cup part were performed based on the free gas bulging test results. A cup part with the height of 20 mm which both of surface quality and fillet radius were satisfactory was formed using a two-stage loading path at 400°C during 300 s. Furthermore the microstructural revolution law during the QPF was discussed. The larger the thinning rate of parts is, the smaller the grain size will be.

Stress Behavior of AZ31 Magnesium Alloy Sheet Asymmetrical Accumulative Rolling-Bond Based on Simulation Analysis

2014 ◽  
Vol 711 ◽  
pp. 181-184
Author(s):  
Guang Ji Xue ◽  
Shou Ren Wang ◽  
Jing Wang ◽  
Chang Xiu Zhou ◽  
Ying Han
Keyword(s):  
Magnesium Alloy ◽  
Simulation Analysis ◽  
Alloy Sheet ◽  
Deformation Resistance ◽  
Az31 Magnesium Alloy ◽  
Test Results ◽  
Asymmetrical Rolling ◽  
Magnesium Alloy Sheet ◽  
Stress Behavior ◽  
Az31 Magnesium Alloy Sheet

Asymmetrical accumulative rolling-bond was a new method to achieve AZ31 magnesium alloy sheet. The stress behavior of AZ31 magnesium alloy sheet asymmetrical accumulative rolling-bond was studied by simulation analysis. Test results show that the deformation resistance has a significant reduction in composite rolling, compared to the simple accumulative or asymmetrical rolling alone. And asynchronous ratio of two rolls was discussed in relation to deformation resistance.

Effect of Lubrications on Quick Plastic Forming Behavior of AZ31 Magnesium Alloy Sheet

2013 ◽  
Vol 690-693 ◽  
pp. 2222-2225
Author(s):  
Gang Wang ◽  
Jian Long Wang ◽  
Zhi Peng Zhang ◽  
Shen Jie Yao
Keyword(s):  
Magnesium Alloy ◽  
Thickness Distribution ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet ◽  
Part Surface ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Formed Part ◽  
Microscopic Morphology ◽  
Lubrication Conditions

Lubrication plays important role in Quick Plastic Forming (QPF). Friction coefficient between AZ31B magnesium alloy and the die steel was examined by ring upsetting tests at 400°C with no lubrication, boron nitride (BN), graphite and molybdenum disulfide respectively. The effect of the four lubrication conditions on bulging height and wall thickness distribution of conical, rectangular and cylinder components in QPF within 300s was investigated. Macroscopic and microscopic morphology of the formed part surface in the four conditions was observed.

Influence of Annealing on Microstructure and Texture of AZ31 Magnesium Alloy Sheet

2012 ◽  
Vol 430-432 ◽  
pp. 213-216
Author(s):  
Jing Yuan Li ◽  
Zhi Hui Yang ◽  
Jia Fei Wang
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Basal Texture ◽  
Magnesium Alloy Sheet ◽  
Texture Intensity ◽  
Post Annealing ◽  
Az31 Magnesium Alloy Sheet ◽  
Rolling Deformation

There are strong basal textures in AZ31 magnesium alloy sheet. Through rolling and post-annealing, we can significantly reduce the basal texture, and with the rising of deformation, the texture intensity falls. The peak intensity of basal texture reduced from 12 to 4 when the rolling deformation rises to 35%. The influence of post-annealing on grain refinement is very obvious. When the temperature of pre-annealing is 773K and rolling temperature is 623K, the grain size reduce to 201μm after 1% deformation. But we can reduce the grain size to 30μm after post-annealing. If the rolling deformation is 36.4%, the grain size reduces to 73μm. But after post-annealing, the grain size reduces to 12μm.

Superplasticity in Ultrafine Grained Magnesium Alloy AZ31 Prepared by Accumulative Roll Bonding

2007 ◽  
Vol 551-552 ◽  
pp. 249-254 ◽  
Author(s):  
Qing Feng Wang ◽  
X.P. Xiao ◽  
X.J. Chen ◽  
W. Chen
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
Accumulative Roll Bonding ◽  
Superplastic Deformation ◽  
Grain Boundary Sliding ◽  
Alloy Sheet ◽  
Roll Bonding ◽  
Magnesium Alloy Sheet ◽  
Ultrafine Grained

In this paper, an ultra-fine grained AZ31 magnesium alloy sheet with grain size less than 3μm was generated by three-run accumulative roll bonding of as cast alloy at a deformation temperature of 350°C and a reduction of 80% for each pass. The microstructures on the different ARB stages were observed and superplasticity examination in the ultrafine grained AZ31 alloy were carried out at a fixed temperature of 300°C and varied strain rate ranging from 10-4 to 10-1 s-1. It is indicated that significant grain refinement was mainly achieved in the first run and gradual uniformity of grain size in the next by continuous dynamic recrystalization. Besides, a superplastic deformation with a moderate elongation-to-fracture of 316% was obtained at a strain rate of 10-2 s-1 indicating a low temperature and high strain rate superplasticity, while a maximum elongation-to-fracture of 562% at10-4 s-1. The strain rate sensitivity exponent as high as of 0.34-0.41 implies the dominant role of grain boundary sliding in superplastic deformation at strain rate ranging from 10-3 to 10-2 s-1. The results indicate a possible approach to produce magnesium alloy sheet with fine grain and excellent deep drawing workability.

Influence of Hot-Extrusion on Mechanical Properties of AZ31B Magnesium Alloy Sheet

2005 ◽  
Vol 15 (1) ◽  
pp. 25-30
Author(s):  
Yong-Gil Kim ◽  
Hak-Kyu Choi ◽  
Min-Cheol Kang ◽  
Hae-Yong Jeong ◽  
Cha-Hurn Bae
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Hot Extrusion ◽  
Alloy Sheet ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31b Magnesium Alloy Sheet
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