Cr-Ge-Si Alloys for High-Temperature Structural Applications: Microstructural Evolution

Soleimani-Dorcheh, Ali; Galetz, Mathias C.

doi:10.1007/s11661-013-2091-2

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…This is in good accordance with the results, shown in Table 4 found for the samples used in this work. This is also in accordance to the findings for A15 phase of Soleimani-Dorcheh and Galetz [5] published on chromium-based alloys with additions of germanium. The density of the sintered samples is lower for two reasons.…”

Section: à3supporting

confidence: 93%

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Influence of Ingot and Powder Metallurgy Production Route on the Tensile Creep Behavior of Mo–9Si–8B Alloys with Additions of Al and Ge

2017

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Refractory metals and their alloys show potential for high temperature applications, due to the elevated melting points often paired with very good creep resistance. Spark plasma sintering (SPS) as well as arc-melting is used here to prepare quaternary and quinternary Mo-9Si-8B-xAl-yGe (x is 0 or 2; y is 0 or 2, all numbers in at%) samples. All samples consist of a Mo solid solution (Mo ss ) and two intermetallic phases: Mo 3 Si (A15) and Mo 5 SiB 2 (T2). Aluminum and germanium reduce the melting point and slightly decrease the density of the material. The specimens are homogenized and coarsened by a subsequent heat-treatment in vacuum at 1850C for 24 h. The resulting microstructure is investigated using scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), and inductively coupled plasma optical emission spectrometry (ICP-OES) analysis. A vacuum creep testing device for small tensile creep specimens is presented. It is heated by graphite radiation heaters usable up to 1500 C in vacuum of 2 Á 10 -4 Pa with an oil diffusion pump. Tensile creep tests are performed at 1250 C and stresses from 50 MPa up to 250 MPa. Specimens produced by ingot metallurgy feature superior creep properties compared to powder metallurgy samples.

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Section: à3supporting

confidence: 93%

“…[2] For a further increase, new materials are in discussion. Several novel concepts such as Ptbased alloys, [3] refractory metal alloys based on Nb, [4] Cr, [5] and Mo [6,7] and ceramic materials are under study. Berczik et al [8,9] pioneered the work on Mo-Si-B alloys and patented a wide concentration field.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ingot and Powder Metallurgy Production Route on the Tensile Creep Behavior of Mo–9Si–8B Alloys with Additions of Al and Ge

2017

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“…This microstructure is mostly affected by the peritectic transformation, which occurs in the Cr–Ge system . A recent study on microstructural evolution of Cr–Ge–Si system at high Cr corner of the thernary system showed that addition of Ge to the binary Cr–Si system alters the microstructure from a lamellar eutectic structure to a peritectic one .…”

Section: Resultsmentioning

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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Oxidation and Nitridation Behavior of Cr–Si Alloys in Air at 1473 K

Soleimani-Dorcheh

Galetz

2015

Oxid Met

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Cr-Ge-Si Alloys for High-Temperature Structural Applications: Microstructural Evolution

Cited by 13 publications

References 28 publications

Influence of Ingot and Powder Metallurgy Production Route on the Tensile Creep Behavior of Mo–9Si–8B Alloys with Additions of Al and Ge

Influence of Ingot and Powder Metallurgy Production Route on the Tensile Creep Behavior of Mo–9Si–8B Alloys with Additions of Al and Ge

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

Oxidation and Nitridation Behavior of Cr–Si Alloys in Air at 1473 K

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Cr-Ge-Si Alloys for High-Temperature Structural Applications: Microstructural Evolution

Cited by 13 publications

References 28 publications

Influence of Ingot and Powder Metallurgy Production Route on the Tensile Creep Behavior of Mo–9Si–8B Alloys with Additions of Al and Ge

Influence of Ingot and Powder Metallurgy Production Route on the Tensile Creep Behavior of Mo–9Si–8B Alloys with Additions of Al and Ge

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

Oxidation and Nitridation Behavior of Cr–Si Alloys in Air at 1473 K

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