Twinning behaviors of a rolled AZ31 magnesium alloy under multidirectional loading
TL;DR: In this article, the microstructure and texture evolution of an AZ31 magnesium rolled sheet during quasi-static compression at strain rates of 10 − 3 ǫ s − 1 has been investigated by in situ electron backscattered diffraction.
About: This article is published in Materials Characterization.The article was published on 2017-02-01. It has received 34 citations till now. The article focuses on the topics: Crystal twinning & Electron backscatter diffraction.
Citations
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TL;DR: In this paper, the as-cast ZEK100 (Mg 1.2Zn 0.35Zr 0.17Nd, in wt%) magnesium alloy was subjected to hot rolling at temperatures from 350-oC to 450 -oC using the laboratory 50 ton reversible mill with preheated rolls to manufacture the 1.5-1.7mm thick sheet.
47 citations
02 Jan 2019-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effect of 0.5wt% Ca addition on the activity of slip systems in AZ31 magnesium alloy (AZ31-0.5Ca) was investigated.
Abstract: Magnesium is the lightest structural material, but its applications are very limited due to the intrinsic brittleness, which is attributed to the limited number of independent slip systems available at room-temperature. In the present study, accordingly, we investigated the effect of 0.5 wt% Ca addition on the activity of slip systems in AZ31 magnesium alloy (AZ31-0.5Ca). For this purpose, polycrystal plasticity simulation based on viscoplastic self-consistent model was used to simulate the texture of AZ31 alloys (with and without Ca) at 10% tensile deformation, and hence, to predict the relative activities of various slip systems in both alloys. The results confirmed that prismatic slip is the dominated deformation system in AZ31-0.5Ca, leading to a higher ductility as compared to the AZ31 alloy. This, in turn, was attributed to the formation of (Mg,Al)2Ca intermetallic compound due to the Ca addition, as found by microstructural observations using scanning electron microscopy.
46 citations
07 Feb 2018-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, two kinds of micro-tensile test systems for in-situ Electron Back-Scattered Diffraction (EBSD) are developed to explore the difference in microstructure evolution of AZ31 alloy under biaxial tensile stress state (BTSS) and uniaxia-linear tensile stressed state (UTSS) and the different responses of tensile twins (TTs) in various stress states are proved the main reason.
Abstract: In this paper, two kinds of micro-tensile test systems for in-situ Electron Back-Scattered Diffraction (EBSD) are developed to explore the difference in microstructure evolution of AZ31 alloy under biaxial tensile stress state (BTSS) and uniaxial tensile stress state (UTSS). The in-situ EBSD results show that there is an apparent difference of texture evolutions during deformation under BTSS and UTSS and the different responses of tensile twins (TTs) in various stress states are proved to be the main reason. A modified calculation of Schmid factor (SF) for varied stress states further reveals that the distribution of TT SF on {0001} pole figure (PF) determined by BTSS significantly differs from that under UTSS. In addition, the change of stress states also affects the deformation compatibility of TT to slip systems. The poor formability of Mg alloy rolled sheets partly results from the incompatibility between TT and slip systems or tensile twinning under BTSS.
38 citations
TL;DR: In this article, a hot-extruded magnesium alloy AZ31 bar was cut into hexagonal prisms and then compressed at room temperature with the loading direction parallel to the extrusion direction (ED) or perpendicular to ED.
27 citations
TL;DR: In this article, material orientation effects on cyclic deformation and fatigue of a rolled AZ31B magnesium (Mg) alloy were experimentally studied, and significant anisotropy was observed in the monotonic deformation behavior.
27 citations
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TL;DR: In this paper, a combination of experimental and simulation techniques were used to investigate the plastic behavior of wrought magnesium alloy and found that an increased activity of non-basal dislocations provides a self-consistent explanation for the observed changes in the anisotropy with increasing temperature.
1,427 citations
25 Aug 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a series of tensile test results are reported for the common wrought alloy AZ31 and a simple constitutive model is employed to argue that View the MathML source twinning (which gives extension along the c-axis) can increase the uniform elongation in tensile tests.
Abstract: Magnesium and its alloys do not in general undergo the same extended range of plasticity as their competitor structural metals. The present work is part I of a study that examines some of the roles deformation twinning might play in the phenomenon. A series of tensile test results are reported for the common wrought alloy AZ31. These data are employed in conjunction with a simple constitutive model to argue that View the MathML source twinning (which gives extension along the c-axis) can increase the uniform elongation in tensile tests. This effect appears to be similar to that seen in Ti, Zr and Cu–Si and in the so called TWIP phenomenon in steel.
1,102 citations
TL;DR: This work reviews the current state of technology in terms of strain analysis using EBSD and the effects of both elastic and plastic strain on individual EBSD patterns will be considered.
Abstract: Since the automation of the electron backscatter diffraction (EBSD) technique, EBSD systems have become commonplace in microscopy facilities within materials science and geology research laboratories around the world. The acceptance of the technique is primarily due to the capability of EBSD to aid the research scientist in understanding the crystallographic aspects of microstructure. There has been considerable interest in using EBSD to quantify strain at the submicron scale. To apply EBSD to the characterization of strain, it is important to understand what is practically possible and the underlying assumptions and limitations. This work reviews the current state of technology in terms of strain analysis using EBSD. First, the effects of both elastic and plastic strain on individual EBSD patterns will be considered. Second, the use of EBSD maps for characterizing plastic strain will be explored. Both the potential of the technique and its limitations will be discussed along with the sensitivity of various calculation and mapping parameters.
964 citations
TL;DR: With a density of 1.74 g/cm3—about 30% less than aluminum, one-quarter that of steel, and nearly the same as many polymers—magnesium is attractive for lightweight structural systems and, most notably, automotive systems.
Abstract: The compelling need for lightweight, energy-efficient, environmentally benign engineering systems is driving the development of a wide range of structural and functional materials for energy generation, energy storage, propulsion, and transportation. These challenges motivate wider spread use of magnesium—the eighth most common element in the earth's crust and also extractable from seawater. In addition, the ease of recycling, compared with polymers, makes magnesium alloys environmentally attractive. Importantly, with a density of 1.74 g/cm3—about 30% less than aluminum, one-quarter that of steel, and nearly the same as many polymers—magnesium is attractive for lightweight structural systems and, most notably, automotive systems. A typical car weighing 1525 kg currently contains about 975 kg of steel, 127 kg of Al, 114 kg of polymeric materials, and 5 to 6 kg of magnesium ( 1 ). It is estimated that 22.5 kg of mass reduction would improve fuel efficiency by around 1%; thus, automotive manufacturers worldwide have goals to increase the Mg content of automobiles to between 45 and 160 kg ( 1 , 2 ).
839 citations
TL;DR: In this paper, the activation of specific twin variants depending on the strain path induced a significant difference in twinning characteristics, such as twin morphology, volume fraction of twins with strain, and twin texture, and consequently gave rise to a totally different effect on the deformation.
651 citations