Microstructure and Properties of the Refractory Intermetallic Ti5Si3 Compound and the Uhnidirectionally Solidified Eutectic Ti-Ti5Si3 Alloy / Gefüge und Eigenschaften der hochschmelzenden intermetallischen Phase Ti5Si3 und der gerichtet erstarrten eutektischen Legierung Ti-Ti5Si3

Frommeyer, G.; Rosenkranz, Rainer; Lüdecke, Christa

doi:10.1515/ijmr-1990-810501

Cited by 13 publications

(7 citation statements)

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“…Unidirectionally solidified Ti-Ti 5 Si 3 composite, produced by the electron beam zone melting technique has shown a much higher fracture toughness of about 11 MPa m 1/2 at room temperature. 198 Although Nb 5 Si 3 has shown very poor fracture toughness and very high brittleness even at elevated temperatures, in situ composites of Nb solid solution and Nb 5 Si 3 have shown a remarkable improvement in fracture toughness, while retaining the high strength. [64][65][66][67][68][69][70][71][72][73][74]153,[199][200][201][202][203][204][205][206] The flexural strength and fracture toughness values of selected Nb-silicides along with the composition and method of experimentation are shown in Table 8.…”

Section: Other Silicidesmentioning

confidence: 99%

Mechanical behaviour and oxidation resistance of structural silicides

Mitra¹

2006

International Materials Reviews

256

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The need for high performance materials in aerospace, automotive and industrial components operating at temperatures in the range of 1100-1500uC has led to a surge in the research and development of the refractory metal silicide based intermetallics, multiphase alloys and composites. The silicides of Mo, W, Ti, Nb and Cr are attractive for high melting points, strength retention and ductile behaviour, combined with reasonable to excellent oxidation resistance at elevated temperatures. The major limitation to the widespread use of structural silicides is their inherent brittleness and poor fracture toughness at room temperature, which may be improved further by suitable alloying or tailoring composite microstructures or use of innovative processing routes. The high temperature deformation behaviour of the structural silicides is complex, and depends on the composition and alloy content, crystal structure, character of bonding and orientation, microstructural constitution (nature of phases present and volume fraction), and grain size. Over the past decade, the basic character and role of dislocations involved in the deformation of single or polycrystalline samples at different temperatures and strain rates, including creep conditions, have been investigated in order to understand the operating mechanisms and decide on the strategies to further improve the mechanical properties. Oxidation behaviour in different structural silicides has been studied with emphasis on the constitution of the oxide scale and the kinetics of oxidation under different temperature regimes, which also involve pest disintegration at intermediate temperatures. The present study is a review with a comparative assessment of the known mechanisms of deformation, fracture and oxidation along with strategies to improve the properties to the targeted levels and some of the emerging applications of structural silicides.

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Section: Other Silicidesmentioning

confidence: 99%

Mechanical behaviour and oxidation resistance of structural silicides

Mitra¹

2006

International Materials Reviews

256

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“…2b and Table 2), this material is a metal-matrix composite of Ti-Si-Al-Sn-C system with high titanium content. It possibly comprises the titanium matrix phase, Ti5Si3 phase [54,56,61], Ti3SiC2 MAX phase, and titanium carbide phase. EDX mapping (Fig.…”

Section: Xrd Analysis Of the Studied Compositesmentioning

confidence: 99%

“…4b and Table 3) showed 76.79 wt% Ti, 6.77 wt% C, 3.88 wt% Al, 5.75 wt% Si, and 6.81 wt% Zr in this material. Thus, this material is a metal-matrix composite of Ti-Si-Al-Zr-C system possibly comprising the titanium matrix phase, (Ti, Zr)5Si3 phase [54,56,61], Ti3SiC2 MAX phase, and titanium carbide phase.…”

Section: Xrd Analysis Of the Studied Compositesmentioning

confidence: 99%

“…Unexpectedly, no signs of carbon were detected. Like composite 2, this material is a metal-matrix composite of Ti-Si-Al-Zr-C system possibly comprising the α-Ti matrix phase, (Ti, Zr)5Si3 phase [54,56,61], Ti3SiC2 MAX phase (only according to XRD analysis), and titanium carbide phase. Locations of these phases may also be determined using EDX mapping (Fig.…”

Section: Ti-si-al-zr-c Composite (3)mentioning

confidence: 99%

“…In particular, MAX phases are formed as quite distinct regions along the boundaries of titanium or chromium grains in Ti and Cr based composites [52][53][54][55]. It was shown in a number of works that MAX phases may be effectively used in aerospace industry and mechanical engineering as well as in power generation equipment [2,54,56]. MAX phases are ternary compounds which can be described by the conditional formula Mn+1AXn (n = 1, 2, 3 …).…”

Section: Introductionmentioning

confidence: 99%

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THE EFFECT OF ULTRA-FINE ALLOYING ELEMENTS ON THE PHASE COMPOSITION, MICROSTRUCTURE, HIGH-TEMPERATURE STRENGTH AND FRACTURE TOUGHNESS OF Ti–Si–X AND Ti–Cr–X COMPOSITES

Kulyk

Vasyliv

Duriagina

et al. 2022

Acta Metall Slovaca

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Advanced Ti-based composites are promising for applications in components of modern aircraft and rocket engines as well as other power equipment owing to their high strength-to-weight ratio and fracture toughness in a temperature range of 20 °C to 650 °C. However, there is a need to increase their operating temperature range up to 700−800 °C. In this work, mechanical behavior of Ti–Si–X composites (X=Al and/or Zr, Sn, C) has been studied. For comparison, mechanical behavior of Ti–Cr–X composite (X=Al and/or C) has been studied. As-cast and thermo-mechanically deformed series of beam specimens were examined. Strength tests of specimens were performed under three-point bending in a temperature range of 20 °C to 1000 °C. Single-edge notch beam (SENB) tests under three-point bending of specimen series were carried out in a temperature range of 20 °C to 900 °C for estimating fracture toughness of materials. Based on the constructed dependences of fracture toughness and strength on testing temperature for the specimen series as well as the microstructure and failure micromechanism analyses, the role of ultra-fine alloying elements in achieving good high-temperature strength and fracture toughness of the studied composites was substantiated.

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