Microstructure, oxidation resistance and high-temperature strength of γ′ hardened Pt-base alloys

Wenderoth, Markus; Völkl, Rainer; Vorberg, Stefan; Yamabe‐Mitarai, Yoko; Harada, Hiroshi; Glatzel, Uwe

doi:10.1016/j.intermet.2006.09.009

Cited by 38 publications

(21 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various studies have shown that a similar hardening mechanism can be applied to Pt-base alloys: i.e. a Pt-rich solid solution with a L1 2 ordered cuboidal Pt 3 Al phase precipitated [3,4]. Previous investigations showed Pt alloys at compositions close to 12 at.% Al, 6 at.% Cr, 6 at.% Ni, and Pt balance, with microstructures and lattice misfits similar to conventional Ni-base superalloys [5,6].…”

Section: Introductionmentioning

confidence: 94%

Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations

Preußner

Prins

Völkl

et al. 2009

Materials Science and Engineering: A

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 94%

Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations

Preußner

Prins

Völkl

et al. 2009

Materials Science and Engineering: A

View full text Add to dashboard Cite

“…Three major ranges of Pt-based alloys have been developed. One is based on Pt-Al-Cr-Ni (Hüller et al, 2005;Wenderoth et al, 2005Wenderoth et al, , 2007Rudnik et al, 2008;Völkl et al, , 2009 and two are based on Pt-Al-Cr-Ru (Cornish et al, 2009a(Cornish et al, , 2009b Douglas et al, 2009). For the Pt-Al-CrRu alloys, one set was more malleable but less resistant to extreme chemical environments, whereas the other had higher chemical resistance, but was more difficult to form.…”

Section: * Dst-nrf Centre Of Excellence In Strong Materialsmentioning

confidence: 99%

“…These differences were significant because they would affect the stabilities of the strengthening Pt 3 Al phases, as well as the amounts that could be produced. The German workers in the PDI collaboration (Fischer, 1992(Fischer, , 2001 Fischer et al 1997 Fischer et al 1999a Fischer et al , 1999bVölkl et al, 2000; Hüller et al, 2005;Rudnik et al, 2008;Vorberg et al, 2004Vorberg et al, , 2005Wenderoth et al, 2007) (Douglas et al, 2007) and showed some similarities to the modelled phase of Chauke et al (2010). The only difference was the purity of the raw materials: those of the Germans were much purer (Cornish and Chown, 2011).…”

mentioning

confidence: 95%

PGMs: A cornucopia of possible applications

Cornish¹

2017

J. South. Afr. Inst. Min. Metall.

View full text Add to dashboard Cite

South Africa has been mining PGMs for many years and has a vested interest in the usefulness of these metals, although originally, there was little thought about downstream beneficiation and some of the products were later purchased, in effect repurchasing the raw materials. However, for about 20 years, it has been realised that in order to build wealth sustainably, at least some of the beneficiation and development has to be done in South Africa. This is because for each stage of beneficiation, the value of the commodity increases and so to buy the PGMs back in a later state is uneconomical. Also, the industries need to be established here in South Africa, so that South Africans can work in them and become part of the workforce and generate their own wealth and sustainability for their families. This is part of the rationale of the AMI.In order to drive this, as well as a viable commercial strategy, with viable and wanted products, there has to be something different in the production mixture, for example, the product has to be better, new or cheaper. This is where research is used to try and develop new capabilities, or to improve them. PGMs, application, product development. PGMs: A cornucopia of possible applications and thermal conductivity of Pt are important (Fischer, 1992). Mechanically, Pt alloyed with rhodium or iridium combine high ductility with adequate creep strength and these properties give the alloys potential for applications in the chemical, space technology and glass industries (Fischer, 2001;Whalen, 1988; Lupton, 1990). In the spacecraft industry, PGMs are used to increase the heat resistance of rocket engine nozzles. A very important application is the manufacture of high-purity optical glasses and glass fibres by using platinum-containing tank furnaces, stirrers and feeders to withstand the high temperatures, mechanical loads and corrosive attack under the glass manufacturing and shaping conditions. In glasses, outstanding purity, homogeneity and the absence of bubble inclusions can be achieved only by using platinum alloys. If ceramic melting vessels were used, ceramic particles would be loosened by erosion, which would contaminate the glass melts and so compromise the desired optical properties such as transmittance. The alloys are expensive, but there are very few other materials that could replace platinum without risk of compromising the product. Thus, this is a valuable and safe use for platinum and some of its alloys. * DST-NRF Centre of Excellence in Strong MaterialsAnother 'standard use' of PGMs is in thermocouples and this arises because of their high electrical and thermal conductivity, as well as stability due to their high corrosion resistance. Typical alloys are Pt-Rh and Pt-Ru. The thermocouples do eventually degrade in aggressive environments and become brittle, but usually without much impairment of the electrical and conductive properties.A long-standing use of PGMs is in catalysts and South Africa has established an autocatalyst manufacturing and refurbishment plant for...

show abstract

“…The calculated B/G ratios of PtAl 2 H x and PtAl 2 are bigger than 1.75, implying that these compounds exhibit ductile behavior, which are different from hydrogen embrittlement of other intermetallic compounds [28,29]. Furthermore, the B/G ratio of H 2 _ I3 (3.29) is lower than that of PtAl 2 (3.58) and H_ I3 (5.38).…”

Section: Mechanical Propertiesmentioning

confidence: 99%