Residual-stress-induced grain growth of twinned grains and its effect on formability of magnesium alloy sheet at room temperature

2015 ◽  
Vol 109 ◽  
pp. 88-94 ◽  
Author(s):  
Se-Jong Kim ◽  
Daeyong Kim ◽  
Keunho Lee ◽  
Hoon-Hwe Cho ◽  
Heung Nam Han
Keyword(s):  
Residual Stress ◽  
Magnesium Alloy ◽  
Grain Growth ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Magnesium Alloy Sheet

Texture of AZ31 Magnesium Alloy Sheet Heavily Rolled by High Speed Warm Rolling

2007 ◽  
Vol 539-543 ◽  
pp. 3359-3364 ◽  
Author(s):  
Tetsuo Sakai ◽  
Hiroshi Utsunomiya ◽  
H. Koh ◽  
S. Minamiguchi
Keyword(s):  
Magnesium Alloy ◽  
High Speed ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Rolling Temperature ◽  
Az31 Magnesium Alloy ◽  
Basal Texture ◽  
Double Peak ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet

Magnesium alloy sheets had to be rolled at elevated temperature to avoid cracking. The poor workability of magnesium alloy is ascribed to its hcp crystallography and insufficient activation of independent slip systems. Present authors have succeeded in 1-pass heavy rolling of AZ31 magnesium alloy sheet below 473K by raising rolling speed above 1000m/min. Heavy reduction larger than 60% can be applied by 1-pass high speed rolling even at room temperature. The improvement of workability at lower rolling temperature is due to temperature rise by plastic working. The texture of heavily rolled AZ31 magnesium alloy sheet is investigated in the present study. The texture of sheets rolled 60% at room temperature was <0001>//ND basal texture. At the rolling temperature above 373K, the peak of (0001) pole tilted ±10-15 deg toward RD direction around TD axisto form a double peak texture. The texture varied through thickness. At the surface, the (0001) peak tilted ±10-15 deg toward TD direction around RD axis to form a TD-split double peak texture. The direction of (0001) peak splitting rotated 90 deg from the surface to the center of thickness. Heavily rolled magnesium alloy sheets have non-basal texture. The sheets having non-basal texture are expected to show better ductility than sheets with basal texture.

Static Recrystallization and Grain Growth in AZ31B-H24 Magnesium Alloy Sheet

2014 ◽  
pp. 139-142 ◽  
Author(s):  
Aravindha R. Antoniswamy ◽  
Jon T. Carter ◽  
Louis G. Hector ◽  
Eric M. Taleff
Keyword(s):  
Magnesium Alloy ◽  
Grain Growth ◽  
Static Recrystallization ◽  
Alloy Sheet ◽  
Magnesium Alloy Sheet

Modified texture and room temperature formability of magnesium alloy sheet by Li addition

2015 ◽  
Vol 9 (3) ◽  
pp. 305-311 ◽  
Author(s):  
Qingshan Yang ◽  
Bin Jiang ◽  
Jun Li ◽  
Hanwu Dong ◽  
Wenjun Liu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Magnesium Alloy Sheet

Improving the room-temperature formability of a magnesium alloy sheet by texture control

2018 ◽  
Vol 724 ◽  
pp. 156-163 ◽  
Author(s):  
Se-Jong Kim ◽  
Changjoon Lee ◽  
Jamyeong Koo ◽  
Jinwoo Lee ◽  
Young-Seon Lee ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Magnesium Alloy Sheet

Research on Formability of AZ31B Magnesium Alloy at Room Temperature

2014 ◽  
Vol 886 ◽  
pp. 3-6
Author(s):  
Zu Jian Yu ◽  
Jian Hui Li ◽  
Yan Yang
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Strain Ratio ◽  
Alloy Sheet ◽  
Strain Hardening Exponent ◽  
Drawing Ratio ◽  
Plastic Strain Ratio ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31b Magnesium Alloy Sheet

Tensile tests and a cold deep drawing process were developed at room temperature to estimate the stamping formability of AZ31B magnesium alloy sheet. The results show that AZ31B magnesium alloy sheet has poor formability at room temperature with the total elongation of ~ 20%, the yield ratio is about 0.6 and the strain-hardening exponent is 0.18, while the plastic strain ratio is 1.58, and the earing ratio is-0.55.Thus, AZ31B magnesium alloy sheet can not suffer server plastic deformation. It was found that comparatively shallow magnesium alloy cups were satisfactorily formed at room temperature without heating when the punch fillet radius 6mm and the die fillet radius10mm with a 1mm thickness sheet with limit drawing ratio of 1.25.

Formability of AZ31B Magnesium Alloy Sheet in Hydro-Bugling by Pulsating Hydraulic Pressure

2011 ◽  
Vol 295-297 ◽  
pp. 1699-1704
Author(s):  
Liang Yi ◽  
Lian Fa Yang ◽  
Chen Guo
Keyword(s):  
Finite Element ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Hydraulic Pressure ◽  
Excellent Performance ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Forming Technology ◽  
Az31b Magnesium Alloy Sheet

The formability of the magnesium alloy sheets is poor at room temperature even though the magnesium alloy sheets are attractive because of their excellent characteristics. Hydro-forming technology, especially the pulsating hydro-forming, may be a way to improve the formability. Finite element simulations have been conducted to investigate the formability of AZ31B magnesium alloy sheet in hydro-bugling by pulsating hydraulic pressure. The influence of linear pressure, pulsating pressure and pulsating frequency on the maximum bulging height and minimum wall thickness of the formed parts have been analyzed. The research results show that the formability of AZ31B magnesium alloy sheet can be improved dramatically by pulsating hydro-forming. And enough bugling height can be obtained by lesser forming hydraulic pressure. The AZ31B sheet has an excellent performance in formability when the pulsating frequency is properly selected.

New Method for Improving Formability of AZ31B Magnesium Alloy Sheets

2009 ◽  
Vol 610-613 ◽  
pp. 737-741 ◽  
Author(s):  
Guang Sheng Huang ◽  
Wei Xu ◽  
Guang Jie Huang ◽  
Hong Cheng Li ◽  
Fu Sheng Pan
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Orthogonal Experiment ◽  
Alloy Sheet ◽  
New Method ◽  
Technological Parameters ◽  
Magnesium Alloy Sheet ◽  
Before And After ◽  
Cold Rolled

The magnesium alloy sheets have poor plasticity and formability due to their strong (0002) basal texture. In this paper a new method, repeatedly unidirectional bending (RUB), was used to improve formability of the magnesium alloy sheets. The samples were deformed repeatedly by the unidirectional bending at room temperature and annealed. Firstly, RUB route which is the most infection to formability was investigated. There were two RUB route, single surface RUB and reserve surface RUB. The result showed that better formability can be obtained by the reserve surface RUB. Focused on the development of formability of magnesium alloy sheet, the technological parameters, such as RUB passes, radius of support, annealing temperature and holding time, were determined by orthogonal experiment,and hence the optimal RUB process was acquired. Mechanical property of the samples before and after RUB were characterized and compared. After RUB, (0002) basal textural component of cold rolled magnesium alloy sheet was weakened and σb, σ0.2 decreased obviously. The Erichsen values can be considerably enhanced from 3.53mm to around 6.0mm through RUB.The samples were deformed repeatedly by the unidirectional bending at room temperature and annealed. Firstly, RUB route which is the most infection to formability was investigated. There were two RUB route, single surface RUB and

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