Rolling Texture Evolution of AZ31 Magnesium Alloy Sheets by Isothermal Eccentric-Rolls Drawing

Kohzu, Masahide; Nakatsuka, Shota; Higashi, Kenji

doi:10.2320/matertrans.l-mra2008820

Cited by 11 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They reported that the deformation was carried out primarily by basal slip assisted by prismatic and <c + a> pyramidal slip. This splitting of basal poles in front of and behind the RD after final rolling pass on sample B reflects indeed a significant improvement in the sheet formability/rollability by decreasing the basal poles intensity [23][24]. Similar double peak basal poles figures were observed by Kohzu et.…”

Section: Methodssupporting

confidence: 71%

“…The micrograph of this sample shows an equiaxed grain structure [ figure. 2(e)] with an average grain size of 27 µm evaluated by linear intercept method. It is envisaged that these refined equiaxed grains are mainly induced by the dynamic recrystallization (DRX) involved during the repeated pre-heating for about 5 min during multi-pass warm rolling [24]. Another interesting result of sample C is that optical micrograph exhibits twin free grains.…”

Section: Methodsmentioning

confidence: 87%

See 1 more Smart Citation

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness

Kamran

Hasan

Tariq

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness Abstract. In this study the effect of multi-passes warm rolling of AZ31 magnesium alloy on texture, microstructure, grain size variation and hardness of as cast sample (A) and two rolled samples (B & C) taken from different locations of the as-cast ingot was investigated. The purpose was to enhance the formability of AZ31 alloy in order to help manufacturability. It was observed that multi-passes warm rolling (250°C to 350°C) of samples B & C with initial thickness 7.76mm and 7.73 mm was successfully achieved up to 85% reduction without any edge or surface cracks in ten steps with a total of 26 passes. The step numbers 1 to 4 consist of 5, 2, 11 and 3 passes respectively, the remaining steps 5 to 10 were single pass rolls. In each discrete step a fixed roll gap is used in a way that true strain per step increases very slowly from 0.0067 in the first step to 0.7118 in the 26th step. Both samples B & C showed very similar behavior after 26th pass and were successfully rolled up to 85% thickness reduction. However, during 10 th step (27 th pass) with a true strain value of 0.772 the sample B experienced very severe surface as well as edge cracks. Sample C was therefore not rolled for the 10th step and retained after 26 passes. Both samples were studied in terms of their basal texture, microstructure, grain size and hardness. Sample C showed an equiaxed grain structure after 85% total reduction. The equiaxed grain structure of sample C may be due to the effective involvement of dynamic recrystallization (DRX) which led to formation of these grains with relatively low misorientations with respect to the parent as cast grains. The sample B on the other hand showed a microstructure in which all the grains were elongated along the rolling direction (RD) after 90 % total reduction and DRX could not effectively play its role due to heavy strain and lack of plastic deformation systems. The microstructure of as cast sample showed a near-random texture (mrd 4.3), with average grain size of 44 µm & micro-hardness of 52 Hv. The grain size of sample B and C was 14µm and 27µm respectively and mrd intensity of basal texture was 5.34 and 5.46 respectively. The hardness of sample B and C came out to be 91 and 66 Hv respectively due to reduction in grain size and followed the well known Hall-Petch relationship.

show abstract

Section: Methodssupporting

confidence: 71%

Section: Methodsmentioning

confidence: 87%

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness

Kamran

Hasan

Tariq

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…The details of the experimental methods omitted here are identical to those in our previous paper. 7) Test pieces for 90 degree cold V-bending were made up into 20 (RD) Â 12 Â 0.9 mm 3 plates by cutting and grinding from the thickness tapered samples following texture measurements. Punches with tip radii R shown in Table 3 were prepared, and a bending limit R=t was evaluated by a strict criterion as shown in Fig.…”

Section: Test Piece After Drawingmentioning

confidence: 99%

“…This study is based on the idea that annealing is indispensable for sheet forming and final textures are not determined by plastic processing only. Figure 1 shows the scheme of the eccentric-roll drawing 7) (hereinafter called isothermal rolling), in which rolling reduction changes continuously, and the rolls can be heated uniformly in a furnace together with the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the process of texture evolution during rolling deformation was systematically investigated by isothermal eccentric roll drawing as simulation rolling. 7) Double peak textures were obtained at 423-523 K with rolling reductions of 22% and above. About the cold formability, there has been a report on AZ31 sheets annealed at high temperature (773 K) being drawn with a drawing ratio of 1.75.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Texture Randomization of AZ31 Magnesium Alloy Sheets for Improving the Cold Formability by a Combination of Rolling and High-Temperature Annealing

et al. 2010

Self Cite

View full text Add to dashboard Cite

To improve the cold formability of AZ31 magnesium alloy sheets, we investigate texture control by rolling and annealing. The texture ideal for forming close to random orientation was obtained by annealing at 773 K before and after isothermal rolling at 298-573 K. For the randomizing process, such a high temperature in pre-annealing was essential, whereas a slightly lower temperature was acceptable for final annealing, assuming a sufficiently long annealing time. The randomized sheet could be obtained in a wide range of rolling temperatures and reductions. It could also be produced easily with a standard mill without roll heating. The microstructure of the randomized sheet consisted of relatively homogeneous grains 25-30 mm large on average. In a 90 degree V-bending test, a well randomized sheet could be bent without cracking with a minimum bending radius per thickness R=t ¼ 1:4, which was about half of that in commercial AZ31D-O sheets, in spite of manganese content of over 0.6%.

show abstract

Influence of aluminum content on microstructure and performance of Mg-Zn-Ca-Al-Mn magnesium alloys

Huang

Bian

Nakatsugawa

et al. 2023

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Rolling Texture Evolution of AZ31 Magnesium Alloy Sheets by Isothermal Eccentric-Rolls Drawing

Cited by 11 publications

References 9 publications

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness

Texture Randomization of AZ31 Magnesium Alloy Sheets for Improving the Cold Formability by a Combination of Rolling and High-Temperature Annealing

Influence of aluminum content on microstructure and performance of Mg-Zn-Ca-Al-Mn magnesium alloys

Contact Info

Product

Resources

About