Microstructure, Texture, Properties of Mg Alloy and Its Application

Topic Information

Dear Colleagues,

As the lightest metal structural material, magnesium alloys have in recent years been of interest to the automotive, aerospace, and 3C electronics industries, as well as for home appliances and biodegradable devices, owing to their low density (1.78 g/cm³), high specific strength, high specific stiffness, good electromagnetic shielding and thermal conductivity, excellent biocompatibility, etc. Thus, Mg alloys are regarded as having the potential to become the most widely used green structure materials in the 21st century. However, due to the special close-packed hexagonal (hcp) crystal structure of Mg alloys, a typical basal rolled or extruded texture is always generated, which results in poor mechanical properties. Mg alloys’ strength is relatively low, their plasticity and formability at low temperatures are unsatisfactory, and their corrosion resistance is poor, which limit their applications. Thus, identifying how to improve the properties of Mg alloys is urgent if we want to promote their large-scale use in industries. These properties have been proven to be related to Mg alloys’ microstructures (composition, texture, grain size, second phases, etc.), and many methods have been developed to achieve the goal of improving these properties, such as alloy design, plastic deformation, powder metallurgy, etc. to control the microstructures and thus modify the mechanical properties and surface treatment such as coating to improve corrosion resistance. Additionally, new technologies are being developed at the same time. This topic aims to publish the latest high-quality research results on Mg alloys, including Mg-based composites. Short communications, reviews, as well as regular-length original articles are acceptable. All items related to Mg alloy design, microstructure and texture modification, casting and processing technologies, heat treatment, deformation mechanisms, corrosion behaviors, surface treatment, etc., and applications are welcomed.

Dr. Kwang Seon Shin
Dr. Lifei Wang
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Alloys alloys	-	-	2022	19.4 Days	CHF 1000
Coatings coatings	2.9	5.0	2011	13.7 Days	CHF 2600
Materials materials	3.1	5.8	2008	15.5 Days	CHF 2600
Metals metals	2.6	4.9	2011	16.5 Days	CHF 2600

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Published Papers (5 papers)

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20 pages, 17701 KiB  

Open AccessArticle

High-Strength β-Phase Magnesium–Lithium Alloy Prepared by Multidirectional Rolling

by Zhengyou Guo, Qing Ji, Ruizhi Wu, Haoyang Jia, Di An, Xiaochun Ma, Siyuan Jin, Jiarui Li, Jinyang Liu, Huajie Wu, Jinghuai Zhang and Legan Hou

Materials 2023, 16(8), 3227; https://doi.org/10.3390/ma16083227 - 19 Apr 2023

Cited by 2 | Viewed by 1516

Abstract

Magnesium–lithium alloys are popular in the lightweight application industry for their very low density. However, as the lithium content increases, the strength of the alloy is sacrificed. Improving the strength of β-phase Mg–Li alloys is urgently needed. The as-rolled Mg-16Li-4Zn-1Er alloy was multidirectionally [...] Read more.

Magnesium–lithium alloys are popular in the lightweight application industry for their very low density. However, as the lithium content increases, the strength of the alloy is sacrificed. Improving the strength of β-phase Mg–Li alloys is urgently needed. The as-rolled Mg-16Li-4Zn-1Er alloy was multidirectionally rolled at various temperatures in comparison to conventional rolling. The results of the finite element simulations showed that multidirectional rolling, as opposed to conventional rolling, resulted in the alloy effectively absorbing the input stress, leading to reasonable management of stress distribution and metal flow. As a result, the alloy’s mechanical qualities were improved. By modifying the dynamic recrystallization and dislocation movement, both high-temperature (200 °C) and low-temperature (−196 °C) rolling greatly increased the strength of the alloy. During the multidirectional rolling process at −196 °C, a large number of nanograins with a diameter of 56 nm were produced and a strength of 331 MPa was obtained. Full article

(This article belongs to the Topic Microstructure, Texture, Properties of Mg Alloy and Its Application)

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14 pages, 10554 KiB  

Open AccessArticle

Effect of Rolling Parameters on Room-Temperature Stretch Formability of Mg–2Zn–0.5Ca Alloy

by Wei Li, Guangjie Huang, Xingpin Chen and Xinde Huang

Materials 2023, 16(2), 612; https://doi.org/10.3390/ma16020612 - 9 Jan 2023

Viewed by 1551

Abstract

In this work, Mg–2Zn–0.5Ca (wt.%) alloy sheets fabricated according to various rolling parameters were evaluated to investigate the effect of rolling parameters on room-temperature stretch formability. The sheet rolled at 360 °C with a pass rolling reduction of 10~33% exhibited the worst I.E. [...] Read more.

In this work, Mg–2Zn–0.5Ca (wt.%) alloy sheets fabricated according to various rolling parameters were evaluated to investigate the effect of rolling parameters on room-temperature stretch formability. The sheet rolled at 360 °C with a pass rolling reduction of 10~33% exhibited the worst I.E. value of 4.4 mm, while the sheet rolled at 360 °C with a pass rolling reduction of 20~50% exhibited the best index Erichsen (I.E.) value of 5.9 mm. Among the sheets, the (0002) basal texture intensity was the weakest, and the grain basal poles split away from the normal direction toward both the rolling direction and the transverse direction. Microstructural and deformation mechanism measurements of stretch forming to 2 mm for the sheet rolled at 360 °C with a pass rolling reduction of 20~50% by electron backscatter diffraction and in-grain misorientation axes showed that there was a higher activity of {10–12} extension twins and that a prismatic <a> slip was initiated. As a result, the weakening of the texture and the broader distribution of basal poles in the plane contributed to the improved formability of the sheet rolled at 360 °C with a pass rolling reduction of 20~50%. Full article

(This article belongs to the Topic Microstructure, Texture, Properties of Mg Alloy and Its Application)

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12 pages, 2972 KiB  

Open AccessArticle

Microstructural and Textural Investigation of an Mg-Zn-Al-Ca Alloy after Hot Plane Strain Compression

by Kristina Kittner, Madlen Ullmann and Ulrich Prahl

Materials 2022, 15(21), 7499; https://doi.org/10.3390/ma15217499 - 26 Oct 2022

Cited by 2 | Viewed by 1256

Abstract

The formability of magnesium alloys can be significantly improved by Ca as an alloying addition. Compared to conventional alloy sheets such as AZ31, texture modification can be found in rolled Mg-Ca sheets, which reveal a randomized orientation distribution. The hot deformation behavior of [...] Read more.

The formability of magnesium alloys can be significantly improved by Ca as an alloying addition. Compared to conventional alloy sheets such as AZ31, texture modification can be found in rolled Mg-Ca sheets, which reveal a randomized orientation distribution. The hot deformation behavior of a twin-roll cast and homogenized Mg-2Zn-1Al-0.3Ca (ZAX210) alloy was characterized during hot compression at a temperature of 350 °C and strain rates of 0.1 s⁻¹ and 10 s⁻¹. Electron backscatter diffraction (EBSD) analysis was performed in order to describe the microstructural and texture evolution. The ZAX210 alloy exhibits a pronounced dynamic recrystallization (DRX) behavior during compression at high strain rates, while at lower strain rates DRX hardly occurred. This effect can be attributed to different DRX mechanisms that take place as a function of strain rate. At low strain rates, DRX occurred locally at the grain boundaries of the original microstructure, forming a so-called necklace structure. Increasing strain rate results in an increased fraction of recrystallized grains from 18% (0.1 s⁻¹) to 39% (10 s⁻¹). The microstructure revealed that twin boundaries act as nucleation sites for the DRX (TDRX). The recrystallized areas exhibit a weaker texture compared to the deformed microstructure. Full article

(This article belongs to the Topic Microstructure, Texture, Properties of Mg Alloy and Its Application)

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8 pages, 2122 KiB  

Open AccessArticle

Identification of Active Slip Mode and Calculation of Schmid Factors in Magnesium Alloy

by Lichao Li, Chunjoong Kim and Young-Min Kim

Metals 2022, 12(10), 1604; https://doi.org/10.3390/met12101604 - 26 Sep 2022

Cited by 2 | Viewed by 1810

Abstract

Four types of slip systems (basal <a>, prismatic <a>, pyramidal <a>, and pyramidal <a + c>) and two types of twinning (extension twinning {10$\bar{1}$2} and contraction twinning {10$\bar{1}$1}) could be identified in magnesium alloys using scanning electron [...] Read more.

Four types of slip systems (basal <a>, prismatic <a>, pyramidal <a>, and pyramidal <a + c>) and two types of twinning (extension twinning {10$\bar{1}$2} and contraction twinning {10$\bar{1}$1}) could be identified in magnesium alloys using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). In addition, the Schmid factors (SF) of these slip systems were systematically calculated on the basis of the Euler angle which was obtained in EBSD. The identification of slip systems and calculation of SF can help us to understand the contribution made by each type of slip in the plastic deformation of the material, which is important for understanding the deformation mechanism. Full article

(This article belongs to the Topic Microstructure, Texture, Properties of Mg Alloy and Its Application)

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15 pages, 14100 KiB  

Open AccessArticle

Mechanical Behavior and Microstructure Evolution during High-Temperature Tensile Deformation of MnE21 Magnesium Alloy

by Xiangji Li, Jiahui Wang, Yutong Jiang and Maoqiang Zhang

Metals 2022, 12(9), 1431; https://doi.org/10.3390/met12091431 - 29 Aug 2022

Cited by 3 | Viewed by 1326

Abstract

In this study, tensile tests for magnesium–manganese rare earth alloy (MnE21) were conducted with a WDW-300 high-temperature universal testing machine at different temperatures (300 °C~500 °C) and strain rates (1 × 10⁻⁴s⁻¹~1 × 10⁻¹s⁻¹). The [...] Read more.

In this study, tensile tests for magnesium–manganese rare earth alloy (MnE21) were conducted with a WDW-300 high-temperature universal testing machine at different temperatures (300 °C~500 °C) and strain rates (1 × 10⁻⁴s⁻¹~1 × 10⁻¹s⁻¹). The high temperature thermal deformation behavior, dynamic recrystallization, and texture of MnE21 magnesium alloy were analyzed by combining the constitutive equation, hot processing map, and electron backscatter diffraction (EBSD). The results show that the strain compensation equation can accurately predict the thermal deformation behavior. According to the hot processing map, the optimal processing regions were determined to be 350 °C, $\dot{\epsilon }=$ 1 × 10⁻²s⁻¹~$\dot{\epsilon }=$ 1 × 10⁻⁴s⁻¹, and 450–500 °C, $\dot{\epsilon }=$ 1 × 10⁻¹s⁻¹~$\dot{\epsilon }=$ 1 × 10⁻⁴s⁻¹. Based on the EBSD analysis, it was found that dynamic recrystallization of the alloy occurs above 350 °C, it was concluded that dynamic recrystallization was more adequate at 450 °C by analyzing the grain orientation and grain boundary difference orientation distribution. In addition, the texture index at different temperatures was also analyzed and it was found that the material showed a typical extrusion texture internally. During dynamic recrystallization, (01-11) [2-1-11], texture was produced. Full article

(This article belongs to the Topic Microstructure, Texture, Properties of Mg Alloy and Its Application)

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