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Schmitz-Niederau, Martin; Schütze, M.

doi:10.1023/a:1018891527940

Cited by 30 publications

(8 citation statements)

References 9 publications

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“…The extent of spallation depends on many factors such as coefficient of thermal expansion (CTE) difference between the oxides and alloys, mechanical properties and structure of the oxide scale. As the observation of the scale spallation in gamma alloys is quite limited [9], our knowledge about the influences of such factors on scale spallation is almost nothing. For further alloy development, good understanding about oxidation behavior as well as scale spallation is necessary.…”

Section: Introductionmentioning

confidence: 99%

Oxidation behavior of gamma alloys designed for high temperature applications

2005

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Section: Introductionmentioning

confidence: 99%

Oxidation behavior of gamma alloys designed for high temperature applications

2005

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“…For the development of physical defects in some cases it is assumed that an incubation period exists before the actual formation and growth of pores take place. In other cases pore growth starts at the beginning of oxidation and follows laws of the type [35][36][37] …”

Section: Higher Impact Parametersmentioning

confidence: 99%

Development of a Comprehensive Oxide Scale Failure Diagram

2009

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This paper describes a new approach towards the development of a comprehensive oxide scale failure diagram (OSFD) that delineates the mechanical limits of scales for the different types of failure mechanisms. While former diagrams of a similar type were based on relating the critical strain to scale failure to oxide scale thickness, the new approach replaces scale thickness with a comprehensive operational parameter x o that summarizes in a multi-level treatment all contributing factors, e.g. physical defect size, interface roughness, scale thickness, Young's modulus, fracture toughness, etc., that influence failure strain. While this approach should ideally be based on a comprehensive treatment of x o using fully implemented coding, further considerations based on the identification of ''lowimpact'' and ''high-impact'' parameters lead to a simplified OSFD where only the physical defect size is needed. This simplified approach can be used to assess the strain tolerance of oxide scales in industrial operation once the particular diagram has been established from laboratory data.

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“…[92,95,96] Conventional c-TiAl-based alloys as described in Section 2 show a degradation of strength and, in particular, ductility after oxidation at temperatures >700 C. This degradation is caused by the formation of brittle corrosion layers and/or in-terdiffusion zones which act as initiation sites for cracks upon loading. [97,98] Various oxidation protective coating systems have been developed and tested for c-TiAl-based alloys. [96,99] Significant improvements in oxidation resistance were achieved, however, these coatings tend to embrittle the base material due to formation of brittle phases at the interface.…”

Section: Oxidation Behavior and Oxidation Protective Coatingsmentioning

confidence: 99%

Processing and Applications of Intermetallic γ-TiAl-Based Alloys

2000

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REVIEWSDevelopment and processing of high-temperature materials is the key to technological advancements in engineering areas where materials have to meet extreme requirements. Examples for such areas are the aerospace and spacecraft industry or the automotive industry. New structural materials have to be ªstronger, stiffer, hotter, and lighterº to withstand the extremely demanding conditions in the next generation of aircraft engines, space vehicles, and automotive engines. Intermetallic c-TiAl-based alloys show a great potential to fulfill these demands.

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Cited by 30 publications

References 9 publications

Oxidation behavior of gamma alloys designed for high temperature applications

Oxidation behavior of gamma alloys designed for high temperature applications

Development of a Comprehensive Oxide Scale Failure Diagram

Processing and Applications of Intermetallic γ-TiAl-Based Alloys

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