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NICKEL-BASE ALLOY SHEET ALLOYS USED IN AEROSPACE APPLICATIONS

J.H. Tundermann(Inco Alloys International , Inc. , Huntington , WV 25705 , USA Manuscript received 26 August 1996)

金属学报(英文版)

Many gas turbine components are made from nickel alloy sheet. Most are used for directing or containing gases at high temperatures and pressures where metal temperatures can be as high as 1090℃ (2000°F). These applications included combustor systems, casings and liners, transition and exhaust ducting, afterburners, and thrust reversere. Light weight components and sub-assemblies call for alloy sheet with high levels of stength and oxidation resistance. Complex component design calls for excellent ductility and ease of fabrication.The wide range of nickel alloy sheet alloys presently used in aircraft and land-based gas turbines is briefly described and typical properties presented. New sheet alloy developments, involving INCONEL~* alloys 625LCF, 718SPF and MA754, are presented including the process routes involved and material properties.

关键词: :aerospace , null , null , null , null , null , null , null , null

Recent Activities of the Board of Governors of Acta Materialia Inc.July 2007-July 2008

金属学报(英文版)

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Effect of pressure on thermal stability of Mg65Cu25Y10 bulk metallic glass

Scripta Materialia

The pressure effect on thermal stability of Mg65Cu2Y10 bulk metallic glass has been investigated in the pressure range up to 4 GPa. It was found that the behavior of the onset crystallization temperature versus pressure significantly differs in various pressure ranges. (C) 2003 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

关键词: metallic glass;stability;phase transformation;pressure;amorphous-alloys;crystallization;nanocrystallization;transition;liquid;phase

Applications of microdiffraction related to HREM

Microscopy Research and Technique

This paper deals with the coherent and the incoherent microdiffraction, as well as their applications, for example, determination of the nature of defects and boundaries, measurement of the strain field and identification of the symmetry, etc. The localized structure information obtained from microdiffraction has been compared with and complements that provided by HREM. (C) 1998 Wiley-Liss, Inc.

关键词: coherence of source;domain boundary;stacking fault;interference;fringe;strain field;beam electron-diffraction;strained-layer superlattices;antiphase;domain boundaries;elastic relaxation;micro-diffraction;crystals;dislocations;distortions;specimens;phase

Strengthening and improvement of sulfide stress cracking resistance in acicular ferrite pipeline steels by nano-sized carbonitrides

Scripta Materialia

Methods used to strengthen pipeline steels generally involve a reduction in their sulfide stress cracking (SSC) resistance. A non-quench ageing process is proposed to provide higher strength combined with more excellent SSC resistance for acicular ferrite (AF) pipeline steels, while microstructural characteristics are retained. (C) 2005 Acta Materiala Inc. Published by Elsevier Ltd. All rights reserved.

关键词: ageing;strengthening;sulfide stress cracking;pipeline steels

Hardness and strain rate sensitivity of nanocrystalline Cu

Scripta Materialia

The measured hardness of nanocrystalline Cu with grain sizes (( as small as 10 nm still follows the Hall-Petch relation. A rate sensitivity of 0.06 +/- 0.01 and a flow stress activation volume of 8b(3) were determined at d = 10 nm, suggesting grain boundary activities are enhanced but not yet dominant in the plastic deformation. (c) 2006 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

关键词: nanocrystalline Cu;hall-petch relation;grain size;strain rate;sensitivity;plastic-deformation;activation volume;tensile behavior;copper;metals;strength;ductility;fcc;ni;temperature

Compression stress induced flow temperature reduction in a bulk Zr41.2Ti13.8CU12.5Ni10.0Be22.5 metallic glass

Scripta Materialia

For a bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10.Be-0(22.5), flow behavior was investigated under uniaxial pressure up to 1.37 GPa upon continuous heating. Under compression stress, flow temperature is reduced by 45 K/1.37 GPa and the processible temperature range is expected to be possibly widened by about 70 K/1.37 GPa. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

关键词: metallic glasses;hot pressing;plastic;stress;flow;supercooled liquid region;amorphous alloy;transition;deformation;pressure;crystallization;behavior;state

An abnormal strain rate effect on tensile behavior in nanocrystalline copper

Scripta Materialia

An abnormal strain rate effect on the tensile ductility was observed in an electrodeposited nanocrystalline (nc) Cu sample, in which the fracture strain increases significantly at higher strain rates (from 6 x 10(-5) to 1.8 x 10(3) s(-1)). This phenomenon might be associated with a different fracture mechanism in the nc Cu sample compared with that for conventional coarse-grained materials. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

关键词: nanocrystalline material;copper;mechanical property;strain rate;effect;mechanical-properties;room-temperature;nanoindentation;creep;ni

On the ferrite refinement during the dynamic strain-induced transformation: A cellular automaton modeling

Scripta Materialia

Two-dimensional cellular automaton modeling has been performed to investigate the mechanism of ferrite refinement during the dynamic strain-induced transformation (DSIT) from austenite (gamma) to ferrite (alpha) in a low-carbon steel. The simulated results indicate that the refinement of ferrite grains derived from the DSIT could be interpreted in context of "un-saturated" nucleation and limited growth. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

关键词: dynamic strain-induced transformation;refined ferrite grains;low-carbon steel;cellular automaton model;ultrafine ferrite;carbon-steel;cooling rate;austenite;kinetics;growth

Strength-ductility combination of nanostructured Cu-Zn alloy with nanotwin bundles

Scripta Materialia

The tensile properties of mixed structures with microsized recrystallized grains and nanotwin bundles in a Cu-Zn alloy prepared using dynamic plastic deformation (DPD) and subsequent thermal annealing were investigated. A better strength-ductility combination was found in the partially recrystallized samples of the mixed structures with finer recrystallized grains and thinner nanotwins. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

关键词: Dynamic plastic deformation;Nanostructures;Nanotwins;Ductility;Cu-Zn;alloy;dynamic plastic-deformation;mechanical-properties;metals;copper;nanocrystalline