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Correlation of processing, microstructure, and superplasticity in an Al-MG-ZR alloy

Peter C. Lyle

Correlation of processing, microstructure, and superplasticity in an Al-MG-ZR alloy

by Peter C. Lyle

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  • 13 Currently reading

Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

ContributionsMcNelley, Terry R., Kalu, Peter N.
The Physical Object
Pagination63 p. ;
Number of Pages63
ID Numbers
Open LibraryOL25512012M

Mechanical behavior and microstructure evolution of the cast TiAlVNbZrGdB alloy were studied at temperatures from to °С and strain rates in the range s Following phase fields (α2+γ), (α+γ), (α) and (α+β) during heating of alloy were revealed. Microstructure analysis after deformation and mechanical behavior allowed defining main processes. Determining a desirable strain rate-temperature range for superplasticity and elongation-to-failure are critical concerns during the prediction of superplastic forming processes in α + β titanium-based alloys. This paper studies the superplastic deformation behaviour and related microstructural evolution of conventionally processed sheets of Ti-6Al-4V alloy in a strain rate range of 10&ndash.

This is the second volume of an advanced textbook on microstructure and properties of materials. (The first volume is on aluminum alloys, nickel-based superalloys, metal matrix composites, polymer matrix composites, ceramics matrix composites, inorganic glasses, superconducting materials and magnetic materials). It covers titanium alloys, titanium aluminides, iron aluminides, iron and steels. Z. Y. Ma and R. S. Mishra, "Development of ultrafine-grained microstructure and low temperature ( Tm) superplasticity in friction stir processed Al-Mg-Zr," Scripta Materialia, 53 () S. Mohan and R. S. Mishra, "Friction stir microforming of superplastic alloys," Microsystem Technologies, 11 .

  Metallography, Microstructure and Analysis focuses on the art and science of preparing, interpreting, and analyzing microstructures in engineered materials, to better understand materials behavior and performance.   Sotoudeh [] and Bricknell [] believed that diffusion creep is the main superplasticity mechanism of "supral type" alloys with banded microstructure. del Valle et al. [] concluded that Al alloys that were composed of fine-equiaxed grains at the start of the superplastic test deformed mainly by GBS at low strain rate with only small.


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Correlation of processing, microstructure, and superplasticity in an Al-MG-ZR alloy by Peter C. Lyle Download PDF EPUB FB2

However, the microstructure and superplasticity of these alloys processed by severe plastic deformation (SPD) methods remain less understood. In this work, the microstructure and superplastic behavior of an Mg–5Gd–4Y–Zr (GW54) alloy were investigated after processing using extrusion and the SPD processes of equal-channel angular Cited by: CORRELATION OF PROCESSING, MICROSTRUCTURE, Microstructure SUPERPLASTICITY IN AN Al-MG-ZR ALLOY by PETER C.

LYLE Lieutenant, United States Navy B.S.M.E., Massachusetts Maritime Academy, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL Ma   The cold-rolled Al–Mg–Mn–Sc–Zr alloy without any other additional process has superplasticity in wide temperature range from °C to °C and strain rate range from ×10 –3 s −1 to 1×10 –1 s −1.

The highest elongation of % was achieved at °C with initial strain rate of ×10 –3 s −1. (2)Cited by: Superplasticity in an Al–Mg–Zr–Sc alloy produced by equal-channel angular pressing Article in Materials Science and Engineering A (1) July with Reads How we measure 'reads'.

In this work, the microstructure and superplastic behavior of an Mg–5Gd–4Y–Zr (GW54) alloy were investigated after processing using extrusion and the SPD processes of equal-channel.

Correlation of Processing, Microstructure and Superplasticity in an Al-MG-ZR Alloy. March Peter C. Lyle. Microstructure evolution in the thickness center of the Mg alloy substrate during superplasticity. The tensile tests were stopped at several strains, i.e., 8, 50, and % to observe the microstructure evolution during the superplastic elongation.

Evaluation of microstructure and superplasticity in friction stir processed Al Correlation of processing - Volume 19 Issue 11 - I. Charit, R.S. Mishra. M.-T. Pérez-Prado, M.E.

Kassner, in Fundamentals of Creep in Metals and Alloys (Second Edition), Introduction. Superplasticity is the ability of a polycrystalline material to exhibit, in a generally isotropic manner, very high tensile elongations prior to failure (T > T m) [].The first observations of this phenomenon were made as early as [].

SEM micrographs of Mg–2Gd alloy after extrusion and 2 and 4 cycles of CGP are shown in Fig. is evident that after extrusion, as a result of complete dynamic recrystallization (DRX) during hot deformation, a uniform equiaxed microstructure is obtained (Fig.

2a).The microstructure also includes some sparsely distributed fine second phase particles, smaller than μm in size.

Abstract. The microstructure, superplasticity characteristics at a subsolidus temperature (°C), and the room-temperature mechanical properties of an alloy of the Al–Mg–Ni–Fe–Mn–Cr–Zr system have been investigated using the methods of scanning and transmission electron microscopy and.

Microstructure, Texture, and Superplasticity of a Fine-Grained Mg-Gd-Zr Alloy Processed by Equal-Channel Angular Pressing. There are limited reports to date on the microstructure and superplasticity of the Mg-Gd alloys after processing by equal-channel angular pressing (ECAP).

Request PDF | Superplastic behavior and microstructure evolution of a new Al-Mg-Sc-Zr alloy subjected to a simple thermomechanical processing | A new Al-Mg% Sc% Zr (wt. %) alloy. The Al–Mg–Sc alloys have become important materials in research conducted on superplasticity in aluminum-based alloys.

Many results are now available and this provides an opportunity to examine the consistency of these data and also to make a direct comparison with the predicted rate of flow in conventional superplasticity.

The effect of friction stir processing on the superplastic behavior of extruded Al-4Mg-1Zr was examined at °C to °C and at initial strain rates of 1×10−3 to 1 s−1.

A combination of a fine grain size of μm and high-angle grain boundaries in the friction stir-processed (FSP) alloy led to considerably enhanced superplastic ductility, much-reduced flow stress, and a shift to a.

The influence of a 3–10% content of magnesium in Al–Mg–Mn(Cr) alloys on the characteristics of the microstructure of sheet blanks and their superplasticity has been examined.

It has been shown that the minimum size of grains and the best superplasticity are characteristic of the alloy that contains about 7% magnesium and is additionally.

Friction stir processing (FSP) is a novel severe plastic deformation technique to prepare fine-grained metallic materials.

Superplastic behaviors of FSP magnesium alloys have not been fully studied until now. In this study, microstructure and tensile behaviors of a fine-grained Mg-9Al-1Zn alloy prepared by FSP under water are investigated.

Abstract: The manuscript considers microstructure, mechanical and processing properties (formability and solid state weldability) of sheet titanium alloy VT6(Ti-6Al-4V) with improved superplastic properties production of JSC «VSMPO-AVISMA Corporation" for the process of superplastic forming at low temperatures and new experimental cheaper sheet titanium alloy VST2k.

Mg–Gd–Y–Zr alloys have attracted much attention recently due to their ability to exhibit stable fine-grained microstructures and their potential superplastic behavior.

However, the microstructure and superplasticity of these alloys processed by severe plastic deformation (SPD) methods remain less understood.

In this work, the microstructure and superplastic behavior of an. In the present paper, multidirectional forging (MDF), as a severe plastic deformation process, was carried out on an extruded AM60 magnesium alloy.

The microstructure, texture, and mechanical properties of the MDFed samples were examined. Microstructural findings indicated that the grain size of the alloy decreased from to µm after six MDF passes, carried out at a constant.

Due to the advantage of having such a highly refined microstructure, the HRDSR-processed Ca-AZ31 alloy sheet exhibited a high yield stress over MPa and good superplasticity at elevated.

There are limited reports to date on the microstructure and superplasticity of the Mg-Gd alloys after processing by equal-channel angular pressing (ECAP). Accordingly, the effects of ECAP temperature from K to K ( °C to °C) and number of passes (2, 4, and 8) on the microstructure and texture of an extruded Mg-5GdZr (GW50) alloy were investigated by [email protected]{osti_, title = {Superplasticity in aluminum alloys}, author = {Nieh, T G}, abstractNote = {We have characterized in the Al-Mg system the microstructure and mechanical properties of a cold-rolled Al-6MgSc alloy.

The alloy exhibited superplasticity at relatively high strain rates (about s-1). At a strain rate of s-1 there exists a wide temperature range (`C.