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alloys of compositions al-6nd, al-9ce, al-16nd and al-22ce (wt%) were prepared by chill-block melt-spinning at a surface speed of ∼ 29 m s−1 into ribbons of thickness between 20 and 70 μm. the melt-spun ribbons were heat treated for 2 h at 200, 300, 400 and 500 °c. the as-spun and heat-treated ribbons were tested for microhardness and investigated by optical and transmission electron microscopy and x-ray diffraction. age hardening was not observed for any of the alloys, indicating only a limited amount of extended solid solubility as a result of the melt-spinning conditions used. al-9ce and al-6nd were found to be relatively stable at a hardness of ∼ 90 hk0.01 and 75–80 hk0.01, respectively, unaffected by heat treatment at up to 300 °c for 2 h, but heat treatment for 2 h at 400 or 500 °c caused softening. al-6nd and al-9ce as-solidified ribbons comprised a cellular zone b structure with αal cells (of size ∼ 0.5 μm) and intercellular orthorhombic αal11(nd, ce)3. the hardness of al-16nd as-spun was measured as 330±20 hk0.01 unchanged by heat treatment at 200 °c for 2 h, while heat treatment for 2 h at higher temperatures caused softening. as-spun al-16nd consisted of zone a only comprising αal solid solution and orthorhombic α or tetragonal βal11nd3 partly coherent with the matrix. al-22ce had a hardness of 330±20 hk0.01 as-spun but softened on treatment for 2 h at 200 °c. as-spun al-22ce consisted partly of zone a structure extending from the wheel side of the ribbon through half of the thickness. the remaining part of the ribbon consisted of cellular zone b (cell size ∼ 0.2 μm) with intercellular αal/αal11ce3 lamellar eutectic together with areas that were 100% lamellar eutectic (interlamellar spacing 0.09±0.02 μm). all the as-spun microstructures showed coarsening upon heat treatment at sufficiently high temperature. the resulting microstructure after treatment at 500 °c for 2 h consisted of a bimodal distribution of αal11 (nd, ce)3 which formed as large particles on the grain boundaries and smaller ones in the grain interiors. the corresponding microstructure was less coarse for al-16nd and al-22ce.
the crystallization process, both at the initial and subsequent stages, of amorphous al88-re4-ni8 alloys (re = y, sm and ce) has been studied. additionally, the consequences of adding 1 at.% cu replacing ni or al were studied. the stability of the amorphous structure in melt spun ribbons was
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aluminum is lightweight and corrosion-resistant, but much more cost-effective than stainless steel. wenzel metal spinning produces spun aluminum parts in both high quantities and in “one-off” custom spinnings.
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giant magnetoresistance (gmr) has recently been observed in a new system, melt-spun ribbons of cu-mn-al, with /spl delta/r/r(0)=15% at 30 k. the gmr behavior in this system has been extensively studied for a range of compositions. it is suggested that the onset of gmr may be attributed to the appearance of tweed microstructure in the ferromagnetic cu/sub 2/mnal phase. it has also been observed that gmr existed in all samples consisting of a mixture of varying amounts of cu/sub 2/mnal and cu/sub 9/al/sub 4/ phases. extensive transmission electron microscopy studies have been carried out to evaluate the microstructural evolution of the tweed and the observed phases, and to correlate the microstructure with the observed gmr behavior.
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al, al-5.23, al-13.46 and al-33 wt% cu ribbons with different thicknesses,t, have been prepared by chilled block melt spinning under different processing conditions. surface roughness, taken as peak to valley values,r t, measured on both the substrate and air sides of the ribbon, shows great dependence on substrate velocity,v, ejection gas pressure,p, nozzle height above the substrate,h, and a lesser dependence on substrate thermal conductivity,k, and melt superheat, Δt. the bulk density over all the zones shows an increase over conventionally cast alloys of 7.4% for al-33 wt% cu and about 3% for aluminium. microhardness,h n, measurements inside each of the three microstructure zones, which were identified across the ribbon section, show variation witht ash n =h o t −m, where the constanth o depends on the microstructure zone andm depends on the alloy composition. the zone at the substrate side has the highesth n values and that at the air side has the lowest ones. the number of bending cycles to fracture, which is taken as a measure of ductility, increased with ribbon thickness and decreased with copper content.
al-ni-nd-si alloy with nominal composition of al-8 wt.%ni-5 wt.%nd-4 wt.%si was rapidly solidified by using melt-spinning technique to examine the influence of the cooling rate/conditions on microstructure and mechanical properties. the resulting conventional cast (ingot) and melt-spun ribbons were characterized by x-ray diffraction, optical microscopy, scanning electron microscopy together with energy dispersive spectroscopy, differential scanning calorimetry, differential thermal analysis and vickers microhardness tester. the ingot alloys consists of four phases namely {alpha}-al, intermetallic al{sub 3}ni, al{sub 11}nd{sub 3} and fcc si. melt-spun ribbons are completely composed of {alpha}-al phase. the optical microscopy and scanning electron microscopy results show that the microstructures of rapidly solidified ribbons are clearly different from their ingot alloy. the change in microhardness is discussed based on the microstructural observations. - highlights: black-right-pointing-pointer rapid solidification allows a reduction in grain size, extended solid solution ranges. black-right-pointing-pointer we observed the matrix lattice parameter increases with increasing wheel speed. black-right-pointing-pointer melt-spun ribbons consist of partly amorphous phases embedded in crystalline phases. black-right-pointing-pointer the solidification rate is high enough to retain most of alloying elements in the al matrix. black-right-pointing-pointer the rapid solidification has effect on the phase constitution. | osti.gov
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the mechanical properties of the al-7075 material, which is used in important areas such as automotive, aviation and defense industry, are still...
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microstructure and physical properties of melt spun al-17 wt.% ni-10 wt.% cu alloy - volume 50 issue 2
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six quaternary alloys al-6si-3cu-xmg were produced by melt spinning using two different tangential speeds of the copper wheel and characterized using optical microscopy (om), scanning electron microscopy (sem), transmission electron microscopy (tem), x-ray diffraction (xrd) and microhardness.
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microstructure and physical properties of melt spun al-17 wt.% ni-10 wt.% cu alloy - volume 50 issue 2
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we aimed to improve the mechanical properties of alginate fibers by reinforcing with various cellulose nanofibrils (cnfs). pure cellulose nanofibril (pcnf), lignocellulose nanofibril (lcnf) obtained via deep eutectic solvent (des) pretreatment, and ...
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melt-spun al-rich metallic glasses and nanostructured composites were synthesized under various quenching rates. differential scanning calorimetry (dsc), x-ray diffraction and transmission electron microscopic techniques were employed to study the microstructure and devitrification of these samples in more details. the microstructure obtained is strongly sensitive to the quenching rates used. a reduction of the quenching rate from 50 to 9 m/s changed the structure from an amorphous single phase to the coexistence of α-al nanocrystals and amorphous phase, and finally to a combination of α-al, al3(ni,fe), al11ce3 and amorphous matrix. upon devitrifying, a two-stage crystallization reaction was observed but the glass transition was not detected in these samples. the absence of glass transition was presumably due to the formation of pre-existing nuclei. isothermal and non-isothermal dsc measurements indicated that the first crystallization was associated with the growth of α-al nanocrystals controlled by the volume diffusion with a small activation energy of 1.3 -1.7ev. the second crystallization was derived from the growth of al3(ni,fe) and al11ce3 nanophases.
the microstructural features and mechanical properties of three groups of melt-spun al-fe-si-v ribbons were investigated in order to enhance its optimization for elevated temperature applications and their variation with process variables noted. the influence of cooling rate, heat treatments on the microstructure and mechanical properties are discussed. from the combined studies of microstructure, dsc, xrd and theoretical correlations on the crystallization behaviors of these group of ribbons, it can be concluded that the melt spinning conditions and determines the crystallization behaviors and hence the microstructure. thus, the characterization results of the three batches of melt-spun corresponding to the flakes produced in 2003, 2004 and 2005, respectively, varied significantly. it was concluded that the melt-spinning conditions were responsible for the variations in the microstructures and mechanical properties of the ribbons.
the al3zr precipitation behaviours of as-quenched and heat-treated samples of a melt-spun al-0.2cu-l.2mg-0.5zr alloy have been studied by tem. the results show
the crystallization process, both at the initial and subsequent stages, of amorphous al88-re4-ni8 alloys (re = y, sm and ce) has been studied. additionally, the consequences of adding 1 at.% cu replacing ni or al were studied. the stability of the amorphous structure in melt spun ribbons was thermally studied by differential scanning calorimetry, with ce alloys being the most stable. the effect of cu to reduce the nanocrystal size during primary crystallization was analyzed by transmission electron microscopy. this latter technique and x-ray diffraction showed the formation of intermetallic phases at higher temperatures. a clear difference was observed for the ce alloy, with a simpler sequence involving the presence of al3ni and al11ce3. however, for the y and sm alloys, a more complex evolution involving metastable ternary phases before al19re5ni3 appears, takes place. the shape of the intermetallics changes from equiaxial in the ce alloys to elongate for y and sm, with longer particles for sm and, in general, when cu is added to the alloy.