Structure and mechanical properties of Mg^|^ndash;Ca and Mg^|^ndash;Ca^|^ndash;Zr alloys

洋介, 田村; 芳一, 杉本; 博, 早田; マクリーン, アレキサンダー

doi:10.2464/jilm.63.279

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…Experimentally, there is some support for our model. Recent experimental studies have indeed found that Ca solutes enhance non-basal slip deformation (H. Somekawa, private communication) although they make the fracture toughness weaker as a result from the grain boundary segregation 30 , and that Zr solutes improve the elongation to failure with a positive effect on grain refinement 31 32 in which multiple slip plays an important role.…”

Section: Resultsmentioning

confidence: 99%

“…6 , this binding is dissipated over a distance of roughly 3/2 c . Using the binding energy per unit length, and the estimate of the interaction distance, one can estimate the pinning strength of an assumed immobile single Y atom 30 31 32 (this calculation is presented in the Supplementary Information .). Incorporating this pinning strength into simple models for obstacle controlled glide, we estimate that Y levels of 1 at.-% will increase the yield stress of the basal glide plane by approximately 90 MPa.…”

Section: Resultsmentioning

confidence: 99%

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Effect of solute atoms on dislocation motion in Mg: An electronic structure perspective

Tsuru

Chrzan

2015

Sci Rep

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Solution strengthening is a well-known approach to tailoring the mechanical properties of structural alloys. Ultimately, the properties of the dislocation/solute interaction are rooted in the electronic structure of the alloy. Accordingly, we compute the electronic structure associated with, and the energy barriers to dislocation cross-slip. The energy barriers so obtained can be used in the development of multiscale models for dislocation mediated plasticity. The computed electronic structure can be used to identify substitutional solutes likely to interact strongly with the dislocation. Using the example of a-type screw dislocations in Mg, we compute accurately the Peierls barrier to prismatic plane slip and argue that Y, Ca, Ti, and Zr should interact strongly with the studied dislocation, and thereby decrease the dislocation slip anisotropy in the alloy.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of solute atoms on dislocation motion in Mg: An electronic structure perspective

Tsuru

Chrzan

2015

Sci Rep

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“…Provided that Ca concentrations are kept below the solubility limit to avoid Mg 2 Ca formation, the corrosion rate will not sharply accelerate, while solid solutions of Mg-Ca can display appreciable ductility. [103][104][105] Copper (Cu)…”

Section: Calcium (Ca)mentioning

confidence: 99%

Corrosion of magnesium alloys: the role of alloying

Gusieva

Davies

Scully

et al. 2014

International Materials Reviews

420

208

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The demand for light-weighting in transport and consumer electronics has seen rapid growth in the commercial usage of magnesium (Mg). The major use of Mg is now in cast Mg products, as opposed to the use of Mg as an alloying element in other alloy systems and there is an emerging market of wrought Mg products and biomedical Mg components -such that the past two decades have seen a significant number of new Mg-alloys reported. None-the-less, the corrosion of Mg alloys continues to be a challenge facing engineers seeking weight reductions by deployment of Mg. Herein, authors review the influence of alloying on the corrosion of Mg-alloys, with particular emphasis on the underlying electrochemical kinetics that dictate the ultimate corrosion rate. Such a review focusing on the chemistry-corrosion link, both in depth and in a holistic approach, is lacking. As such the authors do not describe aspects such as high-temperature oxidation or cracking, but focus on delivering the state-of-the-art with regards to alloying influences on corrosion kinetics. It has been demonstrated that Mg itself will not be thermodynamically passive in environments of pH,11, regardless of the extent and type of alloying and hence corrosion kinetics require unique attention. Authors consolidate the presentation to include essentially all commercially available alloys and in excess of 350 custom alloys with wide variations in composition; in addition to reviewing the range of intermetallic compounds and impurities that form in such alloys systems. An update is also given regarding mechanistic advances and the role of grain size on corrosion of Mg. A wider understanding of the role of chemical effects upon corrosion of Mg is both timely and serves to highlight metallurgical approaches towards kinetically retarding the corrosion problem. The latter is of key relevance to next generation lightweight alloys and rational design of wrought Mg and bio-Mg.

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“…However, in excess amounts, Zr aggregates into particles larger than 5 µm and reduces the corrosion resistance of Mg alloys [26]. The casting Mg-Ca-Zr alloy has better tensile strength and elongation than Mg-Ca alloy at all Ca content ratios [27]. Heat treatment is important for Mg alloys in application.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Implantation Material: Mechanical Properties and Surface Corrosion Mechanism of Mg-1Ca-0.5Zr Alloy

Chen

Hung

Syu

2019

Metals

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Mg alloy is suitable for biomedical implants as the mechanical properties of Mg are close to those of human bone. Ca is a major element in bone and Zr has a great grain refinement effect. Hence, we developed Mg-1Ca-0.5Zr alloy (XK105) as a biodegradable biomaterial and investigated its mechanical properties and surface corrosion mechanism. The results showed that heat treatment made the secondary phase homogeneous. Tensile tests showed that the heat treatment increased ductility, and that the tensile stress results in the extrusion direction showed better ductility than that in the transverse direction because of the fiber texture and extrusion characteristics. Electrochemistry test results showed that XK105 after heat treatment had a lower corrosion rate than that before heat treatment and that of pure Mg. XK105 after heat treatment formed a calcium phosphate layer after immersion in simulated body fluid; this layer protects Mg from corrosion. Surface roughening treatment increased corrosion because pits on the surface promoted pitting corrosion. This study developed Mg-1Ca-0.5Zr alloy as a biomedical implant material. The results can be used as a reference for the biomedical material industry.

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Structure and mechanical properties of Mg^|^ndash;Ca and Mg^|^ndash;Ca^|^ndash;Zr alloys

Cited by 6 publications

References 18 publications

Effect of solute atoms on dislocation motion in Mg: An electronic structure perspective

Effect of solute atoms on dislocation motion in Mg: An electronic structure perspective

Corrosion of magnesium alloys: the role of alloying

Biodegradable Implantation Material: Mechanical Properties and Surface Corrosion Mechanism of Mg-1Ca-0.5Zr Alloy

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