Mechanical characteristics of a superplastic aluminum-10.2%Mg-0.1%Zr alloy by Thomas S. Hartmann

Cover of: Mechanical characteristics of a superplastic aluminum-10.2%Mg-0.1%Zr alloy | Thomas S. Hartmann

Published .

Written in English

Read online


  • Mechanical engineering

Book details

ID Numbers
Open LibraryOL25584549M

Download Mechanical characteristics of a superplastic aluminum-10.2%Mg-0.1%Zr alloy

Mechanical Characteristics of a Superplastic Aluminum%Mg-O.1%Zr Alloy by Thomas S. Hartmann Lieutenant Commander, United States Navy B.S., Texas A&M University, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL June Author.

Approved for public release; distribution is unlimitedThe elevated temperature mechanical characteristics of an aluminum-magnesium-zirconium alloy were studied. Thermomechanical processing consisted of solution treating and hot working at °C and then warm rolling at Author: Thomas S.

Hartmann. T6 aluminium alloy; Incoloy ; T1- 6A1- 4v titanium alloy; SPF can be formed complex shape with stiffening rims and other structural features.

And also thermal and mechanical processing lead to increase in super plasticity performance. The superplastic forming evaluates the new material and best optimize form cycle. superplastic forming of sheetmetal.

The preform of sheet metal is elongated into integral stiffing member between outer sheets of metal. The stiffness of metal core is determined by pattern of laser welding sinusoidal, truss core and other internal stiffening geometric are produced a single form step by using automatic weld pattern.

Superplastic characteristics. High-temperature tensile tests were performed on a Walter Bay LFM universal testing machine.

The specimens with a gauge length of 14 mm and width of 6 mm were cut along the rolling direction of the sheet of 1 mm thickness. The square grips had a size of 14 × 14 mm 2. All experiments were performed in an. The phase composition, mechanical properties, and superplastic deformation behavior of a novel AlCuYZr alloy were analyzed.

The precipitation of Al 3 (Zr,Y) dispersoids was observed during a homogenization treatment. The precipitates have an L1 2 structure and a mean size of 17 and 19 nm at and °C, respectively. The sheets exhibit a yield strength of MPa, an.

Characteristics of Second Phases. Most superplastic materials that have been discovered are eutectic and eutectoid alloys. Based on this observation, a microstructure consisting of two phases would be considered an essential condition for superplasticity.

In fact, this is not true. This has ushered in low temperature superplastic forming by the production of ultra-fine grain sizes via dispersion strengthening and severe plastic deformation (SPD).

The promise of superplastic forming of Al-Li alloys for the future and the factors including cost that limit the use of Al-Li alloys are also discussed. Superplastic deformation mechanism of AZ31B magnesium alloy sheet was investigated.

Maximum elongation of % and strain rate sensitivity of were obtained at K and a strain rate of 1. Figure 1: Plasticity of the AlZnMgCu alloy at various working temperatures and strain rate x s Superplastic sheet metals enable the fabrication of complex-shaped products with a single working operation using relatively inexpensive tools.

Figure expresses the Al–Li alloy density reductions, tensile yield and ultimate strengths, elastic modulus, fracture toughness (R-curve), and fatigue crack growth resistance (FCGR) as ratios of the equivalent properties of Alclad T3.

There are several points to note: 1. The key attributes of T8E74 are a 5% density reduction and significantly higher fatigue crack growth resistance. The alloy composition corresponds to a relatively large addition of zirconium which provides a dispersion of very fine Al 3 Zr particles that stabilize the wrought structure developed during hot/cold rolling and prevent recrystallization until the onset of superplastic forming [45, 46].

This alloy is a medium strength alloy with mechanical. Cavitation behavior of a superplastic Al alloy during gas blow forming has been investigated by deforming the sheet into a die with a rectangular cavity. Cavitation characteristics could be separated into two stages.

In stage I, the sheet deformed freely as part of a hemi-cylindrical shape, cavity volume increased exponentially with deformation. Velukkudi Santhanam, SK, Pasupathy, G, & Anantha, PK. "Determination of Superplastic Material Properties for Parent Material and Friction Stir Welded Joint of Al-Alloy AAT6." Proceedings of the ASME International Mechanical Engineering Congress and Exposition.

Volume 2A: Advanced Manufacturing. Houston, Texas, USA. November 13–19, In this study, the uniaxial tensile tests were carried out at three strain rates (i.e., 10 −3, 10 −2, and 10 −1 s −1) on a superplastic grade AA aluminum sheet alloy.

In addition, the volume fractions of cavities at different plastic strain levels were assessed using X-ray microtomography. The ability of superplastic metallic alloys to exhibit large elongations to failure at relatively low flow stress is being utilized commercially to form components with complex shapes.

It is demonstr. decimal value. The decimal.0 in all cases pertains to casting alloy limits. Decimals.1, and.2 concern ingot compositions, which after melting and pro-cessing should result in chemistries conforming to casting specification requirements.

Alloy families for casting compositions include the f ollowing: Aluminum and Aluminum Alloys / The ability of superplastic metallic alloys to exhibit large elongations to failure at relatively low flow stress is being utilized commercially to form components with complex shapes.

It is demonstrated that an Al‐Li alloy exhibits superplastic mechanical characteristics, with an. A collaborative University and Industry research project was undertaken to evaluate the performance of as friction stir welded (FSW) and friction stir welded and superplastically formed (FSW-SPF) titanium 6Al-4V alloy sheets.

The purpose of this initial phase of research is to test and evaluate the mechanical properties of FSW and post SPF-FSW mm thick sheets of titanium. An investigation of boundary sliding in the superplastic Pb% Sn eutectic alloy shows that the contribution from sliding is high in the superplastic region II (− 50–60%, where ϵgbs is the.

The superplastic properties of fine–grained materials can be optimized by promoting grain–boundary sliding and inhibiting slip. alloy. A single superplastic. forming. characteristics. Micrograin Superplasticity refers to the ability of fine-grained materials (1 µm. amenable to the superplastic forming practices and equipment now in commercial use.

This paper seeks to show the applicability of alloy SPF to this manufacturing method by describing the superplastic forming characteristics of this alloy and the microstructure of the finished part.

compositions and the mechanical and physical proper- The sources that have been most helpful are the metal and alloy producers, ALLOY DIGEST, WOLDMAN’S ENGI-NEERING ALLOYS, International Nickel’s publications and UNIFIED NUMBERING SYSTEM for METALS and ALLOYS.

These data are presented to facilitate general compari. This paper studies the effects of interfacial friction distribution on the integrity of superplastic formed parts. For that purpose, the deformation of AA superplastic aluminum alloy into a long rectangular box is investigated.

The die surface is divided into five regions for local application of friction coefficients. The need for light-weight materials, especially in the automobile industry, created renewed interest in innovative applications of magnesium materials.

This demand has resulted in increased research and development activity in companies and research institutes in order to achieve an improved property profile and better choice of alloy systems. @article{osti_, title = {Strain and strain-rate hardening characteristics of a superplastic Al-Li-Cu-Zr alloy}, author = {Ash, B A and Hamilton, C H}, abstractNote = {A number of alloys based on the composition of Al-Li-Zr have been shown to be superplastic under at least one of two different microstructural conditions: 1.

fully recrystallized to a fine, stable grain size, and 2. warm. Copper additions up to 3% maintains the superplastic properties of the alloy and has obvious strain rate sensitivity, i.e. the stress rises rapidly with increasing strain rate deformation.

In addition, the alloy with copper and without copper has excellent damping properties, as we can see from figure 3. Zn mass%Al-2 mass%Cu (zinalco) foams.

In this investigation, static fracture, microstructure, and the mechanical behavior of SP alloy (a superplastic grade) were evaluated and compared with two other titanium alloys.

The comparisons were made in terms of suitably designed heat treatment cycles. The heat treatment cycles included annealing and a combination of solutionizing and aging treatments for all three alloys. 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) within which the tensile elongation is over %. Request PDF | Numerical and Experimental Investigation on the Hybrid Superplastic Forming of the Conical Mg Alloy Component | Hybrid superplastic forming (SPF) is a novel sheet metal forming.

An alternative route to prepare superplastic alloy is the thermomechanical treatment (TMT) consisted from the heat treatment in two stages (homogenisation at °C for 10 h and ageing at temperatures from to °C).

Aged samples were hot extruded at °C. [11, 12, 13]. The grain size of samples and superplastic behaviour depends on the. In this work, the superplastic material behavior of Ti-6Al-4V has been correlated with the grain size of the a phase. Because this microstructural state variable is directly observable, the viscoplastic flow kinetics could be determined separately from the state evolution (grain growth).

Characteristics of aluminum alloy microplastic deformation in different structural states. Full Record; Other Related Research; Abstract. The solution to the problem of improving the mechanical properties (including cyclic strength) of structural materials is largely dependent on our knowledge of the laws governing the development of.

The microstructure and mechanical properties of the cast Ti–Al–(Nb,Cr,Mo)–B alloy and a Ti–45Al–8Nb–C alloy after hot extrusion followed by heat treatment were studied in. The Temperature and the Grains of Ti-6Al-4V Alloy on the Uniaxial and Biaxial Deformations for Superplasticity K.

Sato, T. Nishimura and Y. Kimura A Study on Post-SPF Mechanical Characteristics of Ti-6Al-4V Alloy C.M.

Wang and G. Hou Influence of Microcrystalline Structure and Superplastic Deformation on the. alloy, since it is commercially available in sheet form, possesses good mechanical properties and high strength/weight ratio.

A general multi-axial anisotropic microstructure-based constitutive model that describes the deformation behaviour during superplastic forming is first developed.

The book covers commercial pure (CP) titanium, alpha + beta and beta alloys, as well as titanium based intermetallics and titanium matrix composites.

Richly illustrated with more than figures, this compendium takes a conceptual approach to the physical metallurgy and applications of titanium, making it suitable as a reference and tutorial 5/5(2). Abstract: aluminum alloy was processed with combined process of warm rolling and annealing.

Elongation and tensile strength of samples were measured to analyze the influences of annealing temperature and annealing time on its mechanical s show that low temperature superplasticity is very sensitive to temperature.

@article{osti_, title = {Elevated temperature mechanical properties of a Al-Mg alloy processed by equal-channel-angular-extrusion}, author = {Kawazoe, M and Shibata, T and Mukai, T and Higashi, K}, abstractNote = {In the present work, the authors examine the mechanical properties of AA Al-Mg alloy with a submicron structure produced by ECAE process and compare these to an.

To develop a superplastic damper, the mechanical properties of the superplastic ZnAl alloy differently processed are studied by the test, at room temperature.

It is indicated that the alloy at the air cooling after rolling processing has better mechanical properties at room temperature, such as higher ductility and lower work-hardening, which is very useful to a seismic damper. Table 2 shows mechanical properties of some alloys used for implant.

It also shows chemical composition of the alloy which is a determined factor for the formation of microstructure and phases, thus their properties, i.e. mechanical properties. For example, the addition of Al and V into pure Ti greatly increase its tensile strength.The precipitates suppressed superplastic deformation at room temperature and stabilized the grains at elevated temperatures, reducing the grain growth rate of zinc to × 10−2 µ/h at °C.

The deformation characteristics of the alloy are investigated with special emphasis on the influence of the precipitates on the tensile properties.

86927 views Tuesday, November 3, 2020