Microstructural evolution and mechanical properties of Cr-Ru alloys

Ro, Y.; Kobayashi, Toshiharu; Harada, Hiroshi

doi:10.1007/s11661-005-0172-6

Cited by 9 publications

(6 citation statements)

References 11 publications

(11 reference statements)

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“…Solid solution strengthening of chromium by addition of refractory elements such as Ta, Nb, V, Re, W, Mo [1] or Ru [10] can lead to substantial increases of high-temperature strength (Figs. 1 and 2).…”

Section: Alloy Designmentioning

confidence: 99%

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Quaternary chromium-based alloys strengthened by Heusler phase precipitation

Locq

Caron

Ramusat

et al. 2015

Materials Science and Engineering: A

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Section: Alloy Designmentioning

confidence: 99%

“…However, research programs on such alloys have recently resumed. The potential applications are for general high temperature structural materials [3][4][5][6][7][8], or more specifically gas turbines [9][10][11][12], for nuclear plants [13,14] as well as for glass tools [15].…”

Section: Introductionmentioning

confidence: 99%

Quaternary chromium-based alloys strengthened by Heusler phase precipitation

Locq

Caron

Ramusat

et al. 2015

Materials Science and Engineering: A

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“…However, these advantages are negated by the low ductility at room temperature, embrittlement in air at high temperature by nitrogen contamination, and low oxidation resistance at ultra‐high temperatures (>1000 °C) due to the oxidation of chromia . Researchers have been working on enhancing the mechanical and high temperature performance of Cr‐based alloys by micro–macro alloying with binary–ternary or quaternary elements such as Al, Ag, Si, Mo, Ta, W, Ru, Ce, and Nb . As a result, some of the drawbacks were overcome .…”

Section: Introductionmentioning

confidence: 99%

On ultra‐high temperature oxidation of Cr–Cr₃Si alloys: Effect of germanium

Soleimani-Dorcheh

Donner

Galetz

2014

Materials & Corrosion

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The oxidation behavior of Cr–Cr3(Si1−XGeX) alloys with the composition range Cr85GeXSi1−X (0 < X < 15) was studied at 1350 °C. Thermogravimetric measurements showed improved oxidation kinetics by alloying up to 2 at% of Ge, but a significant weight loss was observed when higher Ge was added. Phase analysis and composition of the spalled oxide scales and subscale alloy substrates revealed that eskolaite (Cr2O3) forms the protective scale, while SiO2 (cristobalite) is locally formed below the chromia scale. Addition of up to 2 at% altered the morphology of locally formed silica and subsequently affected the spallation of chromia scale. The morphological observations of the different chromia scales are discussed for all alloys oxidized at 1350 °C.

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“…In order to stabilize or remove the interstitial impurities, scavenging elements, such as tungsten, molybdenum, and rhenium were alloyed with Cr [9]. In 1965, Shruggs surprisingly found that the ductility of Cr and Mo can be increased by mixing with suitable amount of MgO dispersions.…”

Section: Introductionmentioning

confidence: 99%

Ductility Enhancement of Molybdenum Phase by Nano-sizedd Oxide Dispersions

Kang¹

2008

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Project SummaryThe objective of this research is to understand and to remedy the impurity effects for room-temperature ductility enhancement of molybdenum (Mo) based alloys by the inclusion of nano-sized metal oxide dispersions. This research combines theoretical, computational, and experimental efforts. The results will help to formulate systematic strategies in searching for better composed Mo-based alloys with optimal mechanical properties.For this project, majority of the research effort was directed to atomistic modeling to identify the mechanisms responsible for the oxygen embrittling and ductility enhancement based on fundamental electronic structure analysis. Through first principles molecular dynamics simulations, it was found that the embrittling impurity species were attracted to the metal oxide interface, consistent with previous experiments. Further investigation on the electronic structures reveals that the presence of embrittling species degrades the quality of the metallic chemical bonds in the hosting matrix in a number of ways, the latter providing the source of ductility. For example, the spatial flexibility of the bonds is reduced, and localization of the impurity states occurs to pin the dislocation flow. Rice's criterion has been invoked to explain the connections of electronic structure and mechanical properties. It was also found that when impurity species become attracted to the metal oxide interface, some of the detrimental effects are alleviated, thus explaining the observed ductility enhancement effects. These understandings help to develop predictive capabilities to facilitate the design and optimization of Mo and other high temperature alloys (e.g. ODS alloys) for fossil energy materials applications.Based on the theoretical and computational studies, the experimental work includes the preparation of Mo powders mixed with candidate nano-sized metal oxides, which were then vacuum hot-pressed to make the Mo alloys. Several powder mixing methods were evaluated, however, the Mo alloys produced showed little improvement of room-temperature ductility. Finally, toward the end of the research project, a particle mixing process (Hosokawa mechano chemical bonding technology) was applied and the sample Mo alloys showed much improved room-temperature ductility. Follow-up mechanical properties evaluations on the as-processed Mo alloys were carried out using an in-house developed micro-indentation technique which is suitable for in-situ material mechanical properties measurement and ductility/brittle evaluation on small-size sample alloys. Relevant experimental results of the micro-indentation tests are presented. 3 PUBLICATIONS Journal Papers IntroductionIn developing ultra-high temperature structural materials for hot components in fossil energy conversion and combustion systems, there are two important factors to consider: oxidation resistance and mechanical properties. A number of molybdenum-silicide-based intermetallics have attracted considerable interest for many years due to their high...

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Microstructural evolution and mechanical properties of Cr-Ru alloys

Cited by 9 publications

References 11 publications

Quaternary chromium-based alloys strengthened by Heusler phase precipitation

Quaternary chromium-based alloys strengthened by Heusler phase precipitation

On ultra‐high temperature oxidation of Cr–Cr₃Si alloys: Effect of germanium

Ductility Enhancement of Molybdenum Phase by Nano-sizedd Oxide Dispersions

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Microstructural evolution and mechanical properties of Cr-Ru alloys

Cited by 9 publications

References 11 publications

Quaternary chromium-based alloys strengthened by Heusler phase precipitation

Quaternary chromium-based alloys strengthened by Heusler phase precipitation

On ultra‐high temperature oxidation of Cr–Cr3Si alloys: Effect of germanium

Ductility Enhancement of Molybdenum Phase by Nano-sizedd Oxide Dispersions

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On ultra‐high temperature oxidation of Cr–Cr₃Si alloys: Effect of germanium