Calcium-alloyed magnesium alloys

Рохлин, Л. Л.; Nikitina, N. I.; Tarytina, I. E.

doi:10.1007/s11041-009-9127-7

Cited by 20 publications

(5 citation statements)

References 3 publications

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“…The ductile-brittle transition temperature for Ca(Mg,Al) 2 is expected to lie in the range of 590-810 K since its melting temperature would likely lie in between 988 K (T m for CaMg 2 ) and 1352 K (T m for CaAl 2 ). [50,51] The deformation temperature in this study was %443 K which is well below the expected ductile-brittle transition temperature, but consistent with size-dependent plasticity of brittle phases at small scales. The deformation mechanisms of the Mg-C36 Laves phase observed under these and similar conditions have been reported elsewhere.…”

Section: Microstructural Features Of the Deformed Mg-465al-282ca Alloysupporting

confidence: 79%

Determination of the Rate Dependence of Damage Formation in Metallic‐Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

Medghalchi,

Zubair,

Karimi

et al. 2023

Adv Eng Mater

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We study a cast Mg‐4.65Al‐2.82Ca alloy with a microstructure containing an α‐Mg matrix, reinforced with a C36 Laves phase skeleton. Such ternary alloys are targeted for elevated temperature applications in automotive engines, since they possess excellent creep properties. However, in application, the alloy may be subjected to a wide range of strain rates, and thus accelerated testing is often essential. It is, therefore, crucial to understand the effect of such rate variations. Here, we focus on their impact on damage formation. Our analysis is based on high resolution panoramic imaging using scanning electron microscopy, combined with automated damage analysis using deep learning for object detection and classification (YOLOv5). We find, that with decreasing strain rate the dominant damage mechanism for a given strain level changes: at a strain rate of 5•10‐4/s, the evolution of microcracks in the C36 Laves phase dominates damage formation. However, when the strain rate is decreased to 5•10‐6/s, interface decohesion at the α‐Mg/Laves phase interfaces becomes equally important. We also observe a change in crack orientation, indicating an increasing influence of plastic co‐deformation of the α‐Mg matrix and Laves phase. We attribute this transition in the leading damage mechanism to thermally activated processes at the interface.This article is protected by copyright. All rights reserved.

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Section: Microstructural Features Of the Deformed Mg-465al-282ca Alloysupporting

confidence: 79%

Determination of the Rate Dependence of Damage Formation in Metallic‐Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

Medghalchi,

Zubair,

Karimi

et al. 2023

Adv Eng Mater

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“…Some Ca-containing Mg alloys have been characterized by adequate mechanical properties [106], which are achieved through refinement of precipitates and grain size [83,[107][108][109], whereas some Mg-Ca alloys are brittle [83,108]. Li et al [108] reported that the yield strength of AZ91D was improved 20% by alloying with 1 wt.% Ca due to the grain refinement and thinning of the β-phase.…”

Section: Camentioning

confidence: 99%

Oxidation of magnesium alloys at elevated temperatures in air: A review

et al. 2016

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Highlights The oxidation behaviours of Mg alloys from low to high temperatures are reviewed. Characteristics of MgO during oxidation is discussed. Mechanisms of Mg oxidation is presented. Effect of various alloying elements is analysed. AbstractThis paper reviews (i) the oxidation of Mg alloys at elevated temperatures in air; (ii) the influence of alloying elements on the oxidation of Mg alloys; and (iii) the progress in the development of oxidation-resistant Mg alloys. Low oxidation rates have been shown by Mg alloys containing the alloying elements, Ca, Be and rare earth elements. However, these alloying elements may also decrease mechanical properties, such as ductility.

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“…The combination of Mg–Zn and REE and/or Zr, on the other hand, is a well-established practice and used to increase the overall performance of these alloys [ 61 , 62 ]. The fact that Ca can be considered an alternative for REE additions [ 63 , 64 ] is visible as well, as the combination of Ca and REE in the same section is minimal.…”

Section: Mg Alloys With a Low Alloying Contentmentioning

confidence: 99%

Lean Wrought Magnesium Alloys

et al. 2021

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Lean magnesium alloys are considered attractive candidates for easy and economical hot forming. Such wrought alloys, defined here as materials with a maximum alloying content of one atomic or two weight percent, are known to achieve attractive mechanical properties despite their low alloy content. The good mechanical properties and the considerable hardening potential, combined with the ease of processing, make them attractive for manufacturers and users alike. This results in potential uses in a wide range of applications, from rolled or extruded components to temporary biomedical implants. The characteristic behavior of these alloys and the optimal use of suitable alloying elements are discussed and illustrated exemplarily.

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Calcium-alloyed magnesium alloys

Cited by 20 publications

References 3 publications

Determination of the Rate Dependence of Damage Formation in Metallic‐Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

Determination of the Rate Dependence of Damage Formation in Metallic‐Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

Oxidation of magnesium alloys at elevated temperatures in air: A review

Lean Wrought Magnesium Alloys

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