Texture evolution during large-strain hot rolling of the Mg AZ61 alloy

Valle, Jorge F. del; Pérez‐Prado, M.T.; Ruano, Oscar Antonio

doi:10.1016/s0921-5093(03)00043-1

Cited by 280 publications

(150 citation statements)

References 21 publications

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“…2b and 2c). Such a structure was observed by Valle et al in magnesium alloy AZ31 after hot rolling at 450°C and at strain rate of 10 −3 s −1 [6]. Valle concluded that the small grains around big grains resulted from a dynamic recrystalli zation process.…”

Section: Methodsmentioning

confidence: 51%

“…However, the plastic deformation of magnesium alloys is rather problematic due to the strong anisotropy of the hexagonal structure [3]. One of the effects of anisotropy on the hcp structures is the formation of a strong basal texture during rolling, for example [4][5][6]. These strong textures cause great mechanical anisotropy in many magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, very interesting processing methods have been developed. Valle et al processed AZ61 by hot rolling in several thermomechanical routes at strain rates ranging from 10 −4 to 10 −2 s −1 and observed that a decrease of basal texture intensity together with dynamic recrystallization (DRX) led to the enhancement of AZ61 ductility manifested a capacity for large deformations in one pass [6]. Ma et al processed magnesium alloy AM30 at high strain rates and found that, at strain rates > 0.8 s −1 , profuse twinning is activated [7].…”

Section: Introductionmentioning

confidence: 99%

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Structure and Properties of Hot-Rolled and Annealed Az61 Magnesium Alloy

Sułkowski

2017

mafe

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Structure and properties of hot-rolled and annealed AZ61 magnesium alloy Struktura i własności stopu AZ61 po walcowaniu na gorąco i wyżarzaniu AbstractMagnesium alloy AZ61 was processed by hot rolling up to a large thickness reduction (~89%) in several routes with intermediate annealing. The hot rolling process was conducted at 450°C and at a 1.5 s −1 strain rate. The structure and texture evolution as well as the mechanical properties during processing were investigated. The structure studies showed that, during the hot-rolling process, a large number of twins formed, which had an impact on the mechanical properties of the hot-rolled samples. After annealing for 15 minutes, the twins were no longer observed in the annealed samples, causing a significant decrease in hardness. Moreover, an investigation of the hardness showed that annealing for 15 minutes did not remove all of the hardening effects nor did the hardness of the annealed samples decrease to the value before hot rolling. The texture investigations showed that the texture of the hot-rolled samples was a typical basal-type texture. However, the basal pick was split into two tilted towards the rolling direction (RD). The texture changed during annealing while the new strong texture components evolved. The annealing led to an increased intensity of <1010>{1120} texture component and enhanced ductility. It was concluded that the texture changes observed in the present investigations may lead to the enhanced ductility of magnesium alloys and, therefore, help us design a deformation scheme for magnesium alloys consisting of several thermomechanical routes. Keywords: magnesium alloys, texture, hot rolling, annealing StreszczenieStop magnezu AZ61 został odkształcony przez walcowanie na gorąco do sumarycznego zgniotu 89%, w kilku przepustach z wyżarzaniem międzyoperacyjnym. Walcowanie odbywało się w temperaturze 450°C, a prędkość odkształcenia wynosiła 1,5 s −1 . W pracy badano wpływ struktury oraz tekstury na własności mechaniczne stopu AZ61. Badania strukturalne pokazały występowanie

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Section: Methodsmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and Properties of Hot-Rolled and Annealed Az61 Magnesium Alloy

Sułkowski

2017

mafe

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“…Nevertheless, preliminary mechanical property data seemed to show an improved superplastic response in Mg alloys processed via large strain hot rolling [10].…”

Section: Introductionmentioning

confidence: 96%

“…This simple procedure aims to obtain significant grain refinement through a small number of passes with high reduction per pass. It has been shown [10,11] that grain sizes as small as 1-2 m can be obtained after only one to two rolling passes.…”

Section: Introductionmentioning

confidence: 99%

Superplastic Behavior of a Fine Grained AZ61 Alloy Processed by Large Strain Hot Rolling

Pérez‐Prado

Valle

Ruano

2004

MSF

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Abstract.A processing route based on conventional hot rolling has been recently developed to induce significant grain refinement in Mg alloys. The simplicity and rapidity of the processing route as well as the fact that conventional rolling is used, may allow it to be put into practice successfully in industry. This method consists of only two to three rolling passes, each producing a large thickness reduction, and intermediate annealings of 5 minutes duration. The resulting microstructure is mainly formed by very fine grains. Tensile tests at different temperatures and strain rates were performed in order to analyse the mechanical behaviour of the processed AZ61 alloy under different testing conditions. Microstructure and texture evolution during deformation were examined by optical microscopy (OM) and X-ray diffraction, respectively. It is shown that the microstructures developed by large strain hot rolling are capable of exhibiting significant superplastic elongations at moderate to low temperatures. Stress exponents close to 2 were measured during deformation under optimum superplastic conditions. Additionally, grains remained equiaxed and a significant decrease in the texture intensity is observed. This is consistent with the predominance of grain boundary sliding as the main deformation mechanism responsible for superplasticity.

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