Nano-Refinement, Nano-Consolidation: Different Fabrication Routes of Nano-Crystalline Aluminium Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 87-90
Author(s):  
Małgorzata Lewandowska ◽  
Henryk Dybiec ◽  
Mariusz Kulczyk ◽  
Jerzy Latuch ◽  
Krzysztof J. Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Melt Spinning ◽  
Al Alloys ◽  
Grain Boundary Character ◽  
Nano Structures ◽  
Nano Crystalline ◽  
Grain Size And Shape ◽  
Rapidly Solidified ◽  
Warm Extrusion

The aim of the present work was to compare microstructures and mechanical properties of nano-Al alloys fabricated by two different methods: (i) SPD induced grain refinement, (ii) plastic consolidation of nano-powders or nano-crystalline ribbons. SPD grain refinement has been implemented by hydrostatic extrusion, HE. The ribbons were rapidly solidified using a melt spinning methods. Plastic consolidation of powder and ribbons was conducted by warm extrusion. The results of the studies show that by applying various fabrication routes for a given chemical composition, diverse nano-structures can be obtained, which differ in terms of grain size and shape, grain boundary character and dislocation density. As a result, the alloys also differ significantly in the mechanical properties. The findings are discussed in terms of the possibilities for optimizing properties of the bulk-nano-metals.

An analysis of the transport properties and mechanical stability of rapidly solidified Al-Sb alloy

2015 ◽  
Vol 10 (2) ◽  
pp. 2663-2681
Author(s):  
Rizk El- Sayed ◽  
Mustafa Kamal ◽  
Abu-Bakr El-Bediwi ◽  
Qutaiba Rasheed Solaiman
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Melt Spinning ◽  
Elastic Moduli ◽  
Mechanical Stability ◽  
Microstructural Analysis ◽  
Alloy System ◽  
Antimony Content ◽  
The Stability ◽  
Rapidly Solidified

The structure of a series of AlSb alloys prepared by melt spinning have been studied in the as melt–spun ribbons  as a function of antimony content .The stability  of these structures has  been  related to that of the transport and mechanical properties of the alloy ribbons. Microstructural analysis was performed and it was found that only Al and AlSb phases formed for different composition.  The electrical, thermal and the stability of the mechanical properties are related indirectly through the influence of the antimony content. The results are interpreted in terms of the phase change occurring to alloy system. Electrical resistivity, thermal conductivity, elastic moduli and the values of microhardness are found to be more sensitive than the internal friction to the phase changes. 

Microstructural and Mechanical Properties Enhancement in Ultrafine Grained Ni-Cr Alloy

2012 ◽  
Vol 1372 ◽  
Author(s):  
Kuk Hyun Song ◽  
Hye Jin Lee ◽  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Effective Strain ◽  
Initial Material ◽  
Grain Boundary Character ◽  
Ultrafine Grained ◽  
Processed Material ◽  
Average Grain Size ◽  
Ebsd Technique ◽  
Conventional Rolling

ABSTRACTThe present study was carried out to evaluate the microstructures and mechanical properties of severely deformed Ni-30Cr alloy. Cross-roll rolling (CRR) as severe plastic deformation (SPD) process was introduced and Ni-30Cr alloy sheets were cold rolled to a 90% thickness reduction and subsequently annealed at 700 °C for 30 min so as to obtain the recrystallized microstructure. For the analysis of grain boundary character distributions (GBCDs), electron back-scattered diffraction (EBSD) technique was introduced. CRR on Ni-30Cr alloy was effective to enhance the grain refinement through heat treatment; consequently, average grain size was significantly reduced from 33 μm in initial material to 0.6 μm in CRR processed material. This grain refinement directly affected the mechanical properties improvement, in which yield and tensile strengths were significantly increased than those of initial material. In this study, we systematically discussed the grain refinement, accompanying with increase in mechanical properties, in terms of the effective strain imposed by CRR, comparing with conventional rolling (CR).

Microstructures of Rapidly Solidified Aluminum Alloys

1983 ◽  
Vol 28 ◽  
Author(s):  
J.W. Zindel ◽  
J.T. Stanley ◽  
R.D. Field ◽  
H.L. Fraser
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Melt Spinning ◽  
Metastable Phase ◽  
Laser Surface ◽  
Metastable Phase Diagram ◽  
Transmission Electron ◽  
Ternary Additions ◽  
Rapidly Solidified

ABSTRACTAn investigation was performed to study the origin and stability of microstructures in rapidly solidified aluminum alloys. Al-Ni and Al-Fe base alloys were rapidly solidified by means of laser surface melting and melt spinning techniques. Microstructures were studied using optical and transmission electron microscopy. The effect of microstructure on mechanical properties was also studied using microhardness measurements. The origin of the observed microstructural constituents will be explained in terms of features of the metastable phase diagram. The effect of ternary additions on stability will also be considered.

Software for Simulation of Diffusion Process in Polycrystalline Material

2005 ◽  
Vol 237-240 ◽  
pp. 219-223 ◽  
Author(s):  
Hua Long Li ◽  
Jerzy A. Szpunar
Keyword(s):  
Diffusion Process ◽  
Diffusion Processes ◽  
Orientation Imaging Microscopy ◽  
Superplastic Forming ◽  
Grain Boundary Character Distribution ◽  
Triple Junctions ◽  
Orientation Imaging ◽  
Grain Boundary Character ◽  
Nano Crystalline ◽  
Grain Size And Shape

Understanding of diffusion processes in polycrystalline solids is of importance for studying processes like oxidation, precipitation, creep, superplastic forming, annealing and many other processes. In this paper, we will introduce our latest software that is able to simulate the diffusion process in poly and nano-crystalline solids. The diffusion process is simulated based on Random Walk theory. The diffusion matrix can be computer generated or obtained from the experimental measurement using Orientation Imaging Microscopy. The software describes microstructure and incorporates the effects of the material’s texture, grain size and shape, grain boundary character distribution, statistical information on CSL boundary distributions, contribution from triple junctions and interfaces, the trapping of diffusing atoms and interaction of atoms with second phases and voids. A built-in database of diffusivities of various diffusing species and the user friendly interface make the software easy to use. The software is also applicable to thin films and multilayer structures. The output of simulation can be presented as a normalized concentration profile, a two-dimensional contour map of diffusing species, and also using many other statistical representations.

Damping behaviour and mechanical properties of rapidly solidified Al–Fe–Mo–Si/Al alloys

1998 ◽  
Vol 33 (8) ◽  
pp. 2227-2231 ◽  
Author(s):  
DAI SHENGLONG ◽  
LIU DABO ◽  
WAN TIANZHEN ◽  
DAI SHENGLONG
Keyword(s):  
Mechanical Properties ◽  
Al Alloys ◽  
Rapidly Solidified

Structure and Properties Studies of Rapidly Solidified Al-Mn Alloys

2016 ◽  
Vol 682 ◽  
pp. 199-204 ◽  
Author(s):  
Anna Kula ◽  
Ludwik Blaz ◽  
Patrycja Lobry
Keyword(s):  
Mechanical Properties ◽  
Rapid Solidification ◽  
Spray Deposition ◽  
Hot Extrusion ◽  
Al Alloys ◽  
Inert Gas ◽  
Structure And Properties ◽  
Vacuum Degassing ◽  
Rapidly Solidified ◽  
Varied Concentration

Rapid solidification (RS) combined with plastic consolidation by hot extrusion was used to produce Al alloys with additions of varied concentration of Mn. RS flakes were manufactured using an inert gas atomizing of the molten alloy and the spray deposition on the water-cooled cooper roll. Rods of 7mm in diameter were received using cold pressing of RS-flakes, vacuum degassing and hot extrusion procedures. Mechanical properties of as extruded materials were tested in hot compression at temperature range 293K - 773K. It was found that the flow stress was reduced monotonically with deformation temperature for all tested materials. RS alloys exhibit higher mechanical properties than those produced by conventional metallurgy methods. Higher mechanical properties of RS materials are ascribed to beneficial particles morphology obtained due to the rapid solidification. Development of fine Al6Mn particles was observed in all tested RS-materials.

scholarly journals Thermo-Mechanical Processing of Rapidly Solidified 5083 Aluminium Alloy - Structure and Mechanical Properties

2015 ◽  
Vol 60 (1) ◽  
pp. 177-180 ◽  
Author(s):  
T. Tokarski
Keyword(s):  
Mechanical Properties ◽  
Melt Spinning ◽  
Isothermal Annealing ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Alloy Structure ◽  
Rapidly Solidified ◽  
Melt Spinning Technique

AbstractAluminium-magnesium 5083 alloy was rapidly solidified by means of melt spinning technique and plastically consolidated during subsequent hot extrusion process. As a result, rods 8 mm in diameter were obtained. Structure of as-extruded material is characterized by ultra-fined grains, which influences on increasement of mechanical properties of the material. The strengthening effect was further enhanced by application of thermo-mechanical treatment consist of cold rolling combined with isothermal annealing. As a result, reduction of grain size from ∼710 nm to ∼270 nm as well as enhancement of yield stress (330 MPa to 420 MPa) and ultimate tensile strength (410 MPa to 460 MPa) were achieved. Based on received results Hall-Petch coefficients (σ0, k) for 5083 RS material were determined.

Shape Memory Behaviour in Rapidly Solidified TiNi Alloys

1985 ◽  
Vol 58 ◽  
Author(s):  
M. Igharo ◽  
J.V. Wood
Keyword(s):  
Shape Memory ◽  
Grain Refinement ◽  
Melt Spinning ◽  
Formation Energy ◽  
Tini Alloy ◽  
Alloyed Powder ◽  
Dominant Effect ◽  
Shape Memory Behaviour ◽  
Rapidly Solidified

ABSTRACTEquiatomic TiNi alloy has been rapidly solidified by melt spinning. The M3 temperature of ribbon is depressed with respect to samples made from elemental powders. This phenomenon is related to grain refinement. Some of the ribbons have been crushed and the consolidation characteristics of the resulting pre-alloyed powder is compared with that of elemental blends. Sintering activity is higher in elemental compacts as a result of the dominant effect of the a]loy formation energy in elemental blends.

Microstructure and Mechanical Properties of Rapidly Solidified AZ91HP Alloy

2005 ◽  
Vol 488-489 ◽  
pp. 249-252 ◽  
Author(s):  
J. Cai ◽  
Li Lin ◽  
Zhen Liu ◽  
Hai Feng Zhang ◽  
Zhuang Qi Hu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Yield Strength ◽  
Grain Refinement ◽  
Microstructure And Mechanical Properties ◽  
Mg17al12 Phase ◽  
Rapidly Solidified ◽  
Mould Casting ◽  
Copper Mould

Bulk AZ91HP rods with a diameter of 8mm were prepared by copper mould casting. The microstructure and mechanical properties have been studied. The compressive strength, yield strength, elongation and microhardness of the rapidly solidified AZ91HP alloy are 392MPa, 183 MPa, 3.6% and HV87, respectively. It results from grain refinement and reinforcement of β-Mg17Al12 phase.

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