Microstructural Analysis of Segregated Area in Twin Roll Cast Magnesium Alloy Sheet

The knowledge about the formation of hot cracking in magnesium alloys, such as in twin-roll cast magnesium sheets and strips, is fundamental for a good quality of the strips during the further processing by rolling or welding and minimize the reject. Hot cracking often occurs in the so-called mushy zone, when solid phases and melt coexist, at temperatures where the material no longer exhibits ductility. For the evaluation of the hot cracking tendency of an alloy, the width of the HTBR (High-temperature brittleness range) can be used. On the basis of a test on a Gleeble HDS-V40, the HTBR was determined for a twin-roll cast AZ31 magnesium alloy. The transition between ductile forming behaviour and complete brittle reaction of the AZ31 alloy is confirmed by the observation of the fracture surfaces (determination of the fracture type) in the scanning electron microscope (SEM) and is located at 555 °C. The HTBR shows a range 35 K.

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A Decoupling Control Model on Perturbation Method for Twin-Roll Casting Magnesium Alloy Sheet

Journal of Material Science and Technology ◽

10.1016/j.jmst.2015.01.005 ◽

2015 ◽

Vol 31 (5) ◽

pp. 517-522 ◽

Cited By ~ 9

Author(s):

Wenyu Zhang ◽

Dongying Ju ◽

Hongyang Zhao ◽

Xiaodong Hu ◽

Yao Yao ◽

...

Keyword(s):

Magnesium Alloy ◽

Perturbation Method ◽

Control Model ◽

Alloy Sheet ◽

Decoupling Control ◽

Magnesium Alloy Sheet ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Numerical Fatigue Analysis for Twin Roll Cast Magnesium Sheet Metal Structures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.891-892.1021 ◽

2014 ◽

Vol 891-892 ◽

pp. 1021-1026 ◽

Cited By ~ 3

Author(s):

Johannes Dallmeier ◽

Otto Huber ◽

Holger Saage

Keyword(s):

Sheet Metal ◽

Damage Model ◽

Cyclic Stress ◽

Alloy Sheet ◽

Stress And Strain ◽

Load Range ◽

Sheet Plane ◽

Cast Magnesium ◽

Twin Roll Cast ◽

Twin Roll

In cyclic stress and strain controlled tests, the fatigue life was determined for twin roll cast AM50 magnesium alloy sheet metals. Different stress and strain ratios were applied to cover the technical relevant load range. The investigated sheet metal shows a strong basal texture which leads to twinning in compression parallel to the sheet plane direction. Accordingly, at low cycles to failure Nf the cyclic plastic deformation is dominated by twinning and detwinning. In this study an energy based approach for lifetime estimation is presented and compared with the Smith-Watson-Topper damage model as well as with experimental test results. The energy based approach shows a comparatively high correlation at all investigated stress and strain ratios in a wide cycle range (20< Nf <1.000.000) and is adequate for the lifetime prediction at various mean stresses.

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Mechanical Properties and Formability of Ultrasonic Treated Twin Roll Casting Magnesium Alloy Sheet

Rare Metal Materials and Engineering ◽

10.1016/s1875-5372(17)30107-8 ◽

2017 ◽

Vol 46 (3) ◽

pp. 622-626 ◽

Cited By ~ 2

Author(s):

Yu Kun ◽

Xiong Hanqing ◽

Dai Yilong ◽

Teng Fei ◽

Fan Sufeng ◽

...

Keyword(s):

Mechanical Properties ◽

Magnesium Alloy ◽

Alloy Sheet ◽

Magnesium Alloy Sheet ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Effects of Rolling Condition on Warm Deep Drawability of Magnesium Alloy Sheets Produced by Twin-Roll Strip Casting

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.489 ◽

2005 ◽

Vol 475-479 ◽

pp. 489-492 ◽

Cited By ~ 3

Author(s):

Hisaki Watari ◽

Keith Davey ◽

M.T. Alonso Rasgado ◽

L.D. Clark ◽

Ryoji Nakamura ◽

...

Keyword(s):

Magnesium Alloy ◽

Magnesium Alloys ◽

Casting Process ◽

Strip Casting ◽

Drawing Ratio ◽

Deep Drawability ◽

Cast Magnesium Alloy ◽

Cast Magnesium ◽

Hot Rolled ◽

Twin Roll

Effects of rolling conditions on warm deep drawability of cast magnesium alloy that were hot rolled after roll strip casting were investigated to ascertain the feasibility of twin-roll strip casting process of AZ31B magnesium alloy. Hot rolling and heat treatment conditions were changed to examine which conditions were appropriate for producing AZ31B wrought magnesium alloys after strip casting process. Microscopic observation of the crystals of the manufactured wrought magnesium alloys was performed. It has been found that a limiting drawing ratio of 2.7 was possible in a warm deep drawing test of the cast magnesium alloy sheets after being hot rolled.

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