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Elisa Maria Ruiz-Navas

Bio: Elisa Maria Ruiz-Navas is an academic researcher from Charles III University of Madrid. The author has contributed to research in topics: Powder metallurgy & Alloy. The author has an hindex of 26, co-authored 73 publications receiving 1538 citations. Previous affiliations of Elisa Maria Ruiz-Navas include Federal University of São Carlos & Carlos III Health Institute.


Papers
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TL;DR: In this paper, a method for recycling aluminium alloy chips by cold and hot pressing followed by hot extrusion was studied as well as the possibility of using this method to recycle aluminium matrix composite chips.

130 citations

Journal ArticleDOI
TL;DR: This processconsistsofrepeatedwelding-fracturing-welded-weildingwith-aductile-brittlesystem, thecharacteristicsofthepowderwillbesuchastoenhancethe propertiesofthecompositematerials, andthemechanicalpropertiesoftheconsolidatedmaterialsisnotwell-determined as mentioned in this paper.

85 citations

Journal ArticleDOI
TL;DR: In this article, a high energy horizontal ball mill (Zoz attritor) was used to produce aluminium-based metal matrix composite powders, and the influence of the mechanical alloying parameters on morphology, particle size, microhardness, and microstructure of the final powder was studied.
Abstract: Mechanical alloying technique has been used to produce aluminium-based metal matrix composite powders. As base material, the aluminium alloy AA2014 was selected, and two different carbides (VC and TiC) were chosen as reinforcements. Elemental powders (Al, Mg, Si and Cu) and carbide powders were mixed together in a high energy horizontal ball mill (Zoz attritor), with a balls/load (in weight) ratio of 20/1 at 700 rpm for different times (5, 7 and 10 h). The amount of elemental powders was such that the composition of AA2014 alloy (4.4% Cu, 0.5% Mg, 0.7% Si, Al bal., all wt.%) reinforced with 5%vol carbide powders was obtained. The produced composite powders were consequently analysed. The influence of the mechanical alloying parameters on morphology, particle size, microhardness, and microstructure of the final powder was studied. Results show that composite powders can be obtained in an only step with improved properties by means of mechanical alloying. The use of this technique and these powders as raw materials not only eliminates problems associated to other techniques of the MMC production but allows the achievement of materials with enhanced final properties due to a better powder production.

83 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the performance of a composite material reinforced with zirconium diboride by mechanical alloying followed by cold pressing and hot extrusion, and compared the results with the same composite produced by conventional powder metallurgy (PM), and showed that the incorporation of the ZrB2 particles produces only a small increase in the material hardness, but a small decrease in the UTS.
Abstract: The homogenous distribution of the reinforcement phase is an essential condition for a composite material to achieve its superior performance. Powder metallurgy (PM) can produce metal matrix composites in a wide range of matrix reinforcement compositions without the segregation phenomena typical of casting processes. Particularly, mechanical alloying can be used to mix the matrix and reinforcement particles, enhancing the homogeneity of the reinforcement distribution. This work investigates the production of aluminium 6061 reinforced with zirconium diboride by mechanical alloying followed by cold pressing and hot extrusion, and compares the results with the same composite produced by conventional PM and hot extrusion. The incorporation of the ZrB2 particles produces only a small increase in the material hardness, but a small decrease in the UTS when conventional PM is employed. Mechanical alloying breaks the reinforcement particle clusters, eliminates most of the cracks present in the surface of the reinforcement particles, decreases its size and improves its distribution. This enhancement of the composite structure, in addition to the metallurgical aspects promoted by mechanical alloying in the matrix, brings approximately 100% improvements in the composite UTS and hardness, compared with the composites obtained by PM.

67 citations

Journal ArticleDOI
Abstract: The extensive industrial employment of titanium is hindered by its high production costs where reduction of these costs can be achieved using cheap alloying elements and appropriate alternative processing techniques. In this work the feasibility of the production of low-cost titanium alloys is addressed by adding steel to pure titanium and processing the alloys by powder metallurgy. In particular, a spherical 4140 LCH steel powder commonly used in metal injection moulding is blended with irregular hydride-dehydride Ti. The new low-cost alloys are cold uniaxially pressed and sintered under high vacuum and show comparable properties to other wrought-equivalent and powder metallurgy titanium alloys. Differential thermal analysis and X-ray diffraction analyses confirm that Ti can tolerate the employment of iron as primary alloying element without forming detrimental TiFe-based intermetallic phases. Thus, the newly designed α+β alloys could be used for cheaper non-critical components.

66 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.

1,172 citations

Journal ArticleDOI
TL;DR: Powder metallurgy (PM) of titanium is a potentially cost-effective alternative to conventional wrought titanium as mentioned in this paper, which examines both traditional and emerging technologies, including the prod...,.
Abstract: Powder metallurgy (PM) of titanium is a potentially cost-effective alternative to conventional wrought titanium. This article examines both traditional and emerging technologies, including the prod...

336 citations

Journal ArticleDOI
TL;DR: In this article, the deformation behavior and underlying mechanisms that govern Cryomilled materials are discussed and compared with those of nanostructured materials processed via other methods, in an effort to shed light into the fundamental behavior of ultra-fine-grained and nanobased materials.
Abstract: Nanostructured (i.e., 1–200 nm grain size) and ultrafine-grained (i.e., 200–500 nm grain size) metals are of interest, not only as a result of their unusual combinations of physical and mechanical properties, but also because they can be readily synthesized using well-developed synthesis techniques. Cryomilling, i.e., mechanical alloying in liquid nitrogen, is representative of a class of synthesis techniques that attain the nanostructured state via severe plastic deformation. In this overview, published data related to cryomilled materials are reviewed and discussed with particular emphasis on cryomilling mechanisms; microstructure and thermal stability of cryomilled powders; primary consolidation and secondary processing methods; microstructural evolution during consolidation; and mechanical response of consolidated materials. The deformation behavior and the underlying mechanisms that govern cryomilled materials are discussed and compared with those of nanostructured materials processed via other methods, in an effort to shed light into the fundamental behavior of ultrafine-grained and nanostructured materials.

220 citations

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TL;DR: In this article, the authors focus solely on advances in metals, highlighting the current and emerging technologies in metals processing, metal surface treatment, and integration of metals into hybrid materials systems.

217 citations

Journal ArticleDOI
TL;DR: In this paper, the morphological and microstructural changes during mechanical milling of Al powder mixed with 5-vol% nanoscaled alumina particles (35nm) were studied.
Abstract: The morphological and microstructural changes during mechanical milling of Al powder mixed with 5 vol% nanoscaled alumina particles (35 nm) were studied. The milling was performed in a planetary ball mill under argon atmosphere for various times up to 24 h. The process was also conducted for Al and Al–5 vol% Al 2 O 3 (1 μm) powders to explore the role of reinforcement nanoparticles on the mechanical milling stages. The results showed that the addition of hard particles accelerate the milling process, leading to faster work hardening rate and fracture of the aluminum matrix. Meanwhile, the structural evolution during mechanical milling of the microcomposite powder occurred faster than that of the nanocomposite powder. The result of X-ray diffraction analysis by Williamson–Hall method determined that the so-called crystallite size and lattice strain of the Al matrix of nanocomposite are smaller than that of the microcomposite. Meantime, the particle size distribution and bulk powder density of the two composites were found to be rather equal after 20 h milling, but they were significantly different from those of the unreinforced Al. The mechanisms of mechanical milling for the reinforced and unreinforced Al powders are addressed with stressing on the role of alumina particles.

205 citations