scholarly journals Adjustment of the Mechanical Properties of Mg2Nd and Mg2Yb by Optimizing Their Microstructures

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 377
Author(s):  
Jonas Schmidt ◽  
Irene J. Beyerlein ◽  
Marko Knezevic ◽  
Walter Reimers
Keyword(s):  
Tensile Tests ◽  
Industrial Applications ◽  
Heat Treatments ◽  
Mg Alloys ◽  
Mechanical Anisotropy ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
Active Deformation ◽  
Strength Differential ◽  
Wide Range

The deformation behavior of the extruded magnesium alloys Mg2Nd and Mg2Yb was investigated at room temperature. By using in situ energy-dispersive synchrotron X-ray diffraction compression and tensile tests, accompanied by Elasto-Plastic Self-Consistent (EPSC) modeling, the differences in the active deformation systems were analyzed. Both alloying elements change and weaken the extrusion texture and form precipitates during extrusion and subsequent heat treatments relative to common Mg alloys. By varying the extrusion parameters and subsequent heat treatment, the strengths and ductility can be adjusted over a wide range while still maintaining a strength differential effect (SDE) of close to zero. Remarkably, the compressive and tensile yield strengths are similar and there is no mechanical anisotropy when comparing tensile and compressive deformation, which is desirable for industrial applications. Uncommon for Mg alloys, Mg2Nd shows a low tensile twinning activity during compression tests. We show that heat treatments promote the nucleation and growth of precipitates and increase the yield strengths isotopically up to 200 MPa. The anisotropy of the yield strength is reduced to a minimum and elongations to failure of about 0.2 are still achieved. At lower strengths, elongations to failure of up to 0.41 are reached. In the Mg2Yb alloy, adjusting the extrusion parameters enhances the rare-earth texture and reduces the grain size. Excessive deformation twinning is, however, observed, but despite this the SDE is still minimized.

Microstructure and Mechanical Properties of Rapidly Solidified Al-Fe-Ni-Mg Alloys

2011 ◽  
Vol 674 ◽  
pp. 165-170 ◽  
Author(s):  
Anna Kula ◽  
Ludwik Blaz ◽  
Makoto Sugamata
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Rapid Solidification ◽  
Spray Deposition ◽  
Research Work ◽  
Mg Alloys ◽  
Solid Solution Hardening ◽  
Compression Tests ◽  
Microstructure And Mechanical Properties ◽  
Wide Range

Rapid solidification (RS) combined with following mechanical consolidation of RS powders is considered as a valuable commercial method for the production of a wide range of metallic materials having fine-grained structures. Reported research results for various alloys demonstrate better compositional homogeneity, smaller grain size and relatively fine precipitates distributed homogenously in RS alloys than that for the materials produced by conventional metallurgical processing. The effect of rapid solidification on the microstructure and mechanical properties of selected Al-Fe-Ni-Mg alloys have been investigated. The basic item of the research work was obtaining aluminum PM materials strengthened by highly-dispersed transition metal compounds and aluminum-magnesium solid solution. Rapid solidification (RS) of Al-4Fe-4Ni and Al-4Fe-4Ni-5Mg alloys was performed by means of gas atomizing of the molten alloy and the spray deposition on the rotating water-cooled copper roll. Using typical powder metallurgy (PM) methods, i.e. cold pressing, vacuum degassing and hot extrusion, the RS-flakes were consolidated to the bulk PMmaterials. For comparison purposes, the conventionally cast and hot extruded Al-4Fe-4Ni and Al-4Fe-4Ni-5Mg alloys were studied as well. Mechanical properties of as-extruded materials were examined by compression tests performed at 293 K – 873 K. It was found that relatively high strength of as-extruded PM materials was accompanied by high ductility of samples deformed by hot compression test. Structural observations confirmed beneficial influence of rapid solidification on effective refining of intermetallic compounds, although some inhomogeneity of fine precipitates distribution was observed. Nevertheless, it was considered that an effective increase of the microhardness and strength of tested RS materials mostly result from achieved dispersion of structural components and can be intensified by solid solution hardening due to Mg-addition.

scholarly journals A Novel Approach for the Detection of Geometric- and Weight-Related FSW Tool Wear Using Stripe Light Projection

2020 ◽  
Vol 4 (2) ◽  
pp. 60
Author(s):  
Michael Hasieber ◽  
Michael Grätzel ◽  
Jean Pierre Bergmann
Keyword(s):  
Wear Rate ◽  
Tool Wear ◽  
Weld Seam ◽  
Negative Impact ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Industrial Applications ◽  
Robotic Welding ◽  
Friction Stir ◽  
Wide Range

Friction stir welding (FSW) has become an up-and-coming joining method with a wide range of industrial applications. Besides the unique weld seam properties, recent investigations have focused on the process-related tool wear of shoulder and probe, which can have detrimental economic and technological effects. This paper presents a systematic quantitative characterization of FSW tool wear using stripe light projection as a novel method to detect weight and form deviations of shoulder and probe. The investigations were carried out with a robotic welding setup in which AA-6060 T66 sheets, with a thickness of 8 mm, were joined by weld seams up to a total length of 80 m. During the experimental tests, geometrical deviations of the tool induced by wear were detected for varying weld seam lengths and different measuring points on the probe and shoulder. It was shown that wear depended on welding length which in turn caused significant deviations and weight losses on shoulder and probe. Furthermore, it was demonstrated that the wear on shoulder and probe can be considered separately. It was found that there is a progressive wear rate on the shoulder and a degressive wear rate on the probe depending on the weld seam length. To demonstrate the negative impact of tool wear on shoulder and probe after 80 m weld seam length, visual and metallographic inspections and tensile tests were carried out to detect resultant irregularities in the weld seam.

Characterization of antibacterial nanocomposites of polyethylene terephthalate filled with nanosilver-doped carbon black

2020 ◽  
pp. 096739112093530
Author(s):  
Manuel Reyes De Guzman ◽  
Yi-Hua Wen ◽  
Juan Du ◽  
Ling Yuan ◽  
Chin-San Wu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Carbon Black ◽  
Polyethylene Terephthalate ◽  
Antibacterial Properties ◽  
Crystallization Rate ◽  
Tensile Tests ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
X Ray

A new filler for polyethylene terephthalate (PET) was synthesized by doping carbon black (CB) with nanosilver. Images taken from energy-dispersive X-ray spectrometry and X-ray diffraction validated the synthesis of the filler (nanosilver-doped CB (CB-Ag)). We evaluated the effect of CB-Ag on the mechanical, thermal, and antibacterial properties of the nanocomposites (CB-Ag/PET). Thermogravimetric analyses, morphology, and tensile tests indicated that thermodegradation, crystallization rate, and tensile strength were all improved as a result of filling PET with CB-Ag. Excellent antibacterial properties were imparted to PET nanocomposites, which would be useful for a wide array of industrial applications.

Mineralogical and crystal-chemical characterization of the talc ore deposit of Minzanzala, Gabon

Clay Minerals ◽  
2019 ◽  
Vol 54 (3) ◽  
pp. 245-254
Author(s):  
Mathilde Poirier ◽  
Jean-Eudes Boulingui ◽  
François Martin ◽  
Michel Mbina Mounguengui ◽  
Charles Nkoumbou ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Spectroscopic Characterization ◽  
Industrial Applications ◽  
Crystal Chemical ◽  
X Ray Diffraction ◽  
Wide Range ◽  
Two Samples ◽  
Fe Oxyhydroxides ◽  
Chemical Purity

AbstractThis research aims to characterize the mineralogical and crystal-chemical purity of two samples of natural talc (BTT6, BTT7) from the occurrence ‘Ecole1’ in the deposit of Minzanzala, southwest Gabon. X-ray diffraction and modal-composition calculations demonstrated the presence of quartz and Al–Fe-bearing phases (kaolinite and/or chlorite and/or Al–Fe oxyhydroxides) as accessory minerals in both ores. In contrast, the chemical and spectroscopic characterization of the talc component revealed remarkable chemical purity expressed by very low Fe contents. According to these results, the talc of Minzanzala might be used as a filler in a wide range of industrial applications, such as in cosmetics, paints, polymers or ceramics.

Investigation of Thermal Sprayed Stainless Steel/WC-12wt%Co Nanocomposite Coatings

2011 ◽  
Vol 695 ◽  
pp. 441-444 ◽  
Author(s):  
Chaiyasit Banjongprasert ◽  
Piyaporn Jaimeewong ◽  
Sukanda Jiansirisomboon
Keyword(s):  
Stainless Steel ◽  
Steel Powder ◽  
Industrial Applications ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Cross Sectional ◽  
X Ray ◽  
Spray Coatings ◽  
Wide Range

The thermal spray coatings of stainless steel with nano-sized particles as reinforcement have been studied. Stainless steel powder mixed with 0, 2.5, 5 and 10 wt% WC-12wt%Co nano-sized powder was flame sprayed. The presence of WC-12wt%Co nano-particles in mixed powders as feedstock was confirmed. The microstructure of the coatings has been investigated using a wide range of characterization techniques: optical microscopy with image analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) to understand the microstructure evolution. Chemical composition and microstructure of the coatings showed that the coatings contained stainless steel, WC, Co, and oxide layers. The addition of WC-12wt%Co increased cross-sectional hardness, reduced porosity and friction coefficient. The improved wear properties demonstrate a high potential for industrial applications of stainless steel/WC-12wt%Co coatings.

scholarly journals Low-Cost Synthesis and Characterization of Silver Nanoparticles for Diverse Sensing Application

2019 ◽  
Vol 9 (2) ◽  
pp. 3915-3917
Author(s):  
S. Akhtar ◽  
Z. Farid ◽  
H. Ahmed ◽  
S. A. Khan ◽  
Z. N. Khan
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Reduction ◽  
Low Cost ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
X Ray ◽  
Wide Range ◽  
Range Of Functions

Silver (Ag) nanoparticles (NPs) are synthesized and characterized by a low-cost chemical reduction method. Silver nanoparticles (Ag NPs) have pre-occupied the consideration of the scientific community due to their wide range of functions, utility and industrial applications, particularly in the fields of sensing technologies and medicine (particularly their efficiency against microbes, the ability of healing the wound and anti-inflammatory properties). Ag NPs are synthesized by a low-cost fabrication method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray diffraction (EDX) and photometry techniques are used in this work to identify their nature and potentiality for diverse applications in sensing technologies.

scholarly journals Explosive Welding of Thin Aluminum Plate onto Magnesium Alloy Plate Using a Gelatin Layer as a Pressure-Transmitting Medium

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 106 ◽  
Author(s):  
Daisuke Inao ◽  
Akihisa Mori ◽  
Shigeru Tanaka ◽  
Kazuyuki Hokamoto
Keyword(s):  
Explosive Welding ◽  
Industrial Applications ◽  
Mg Alloys ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Alloy Plate ◽  
Intermediate Layers ◽  
Energetic Condition ◽  
Gelatin Layer ◽  
Thin Aluminum

Mg alloys are extensively used in various automotive, aerospace, and industrial applications. Their limited corrosion resistance can be enhanced by welding a thin Al plate onto the alloy surface. In this study, we perform the explosive welding of a thin Al plate, accelerated by the detonation of an explosive through a gelatin layer as a pressure-transmitting medium, onto two Mg alloy samples: Mg96Zn2Y2 alloy containing a long-period stacking ordered phase in an α-Mg matrix and commercial AZ31. The bonding interface is characterized using optical microscopy, scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. Under moderate experimental conditions, the thin Al plates are successfully welded onto the Mg alloys, showing typical wavy interfaces without intermediate layers. Due to the decreased energetic condition corresponding to the use of a thin flyer plate and gelatin medium, the resulting bonding quality is better than that obtained using a regular explosive welding technique. Further, based on the well-known window for explosive welding, we estimate that the experimental conditions for successful bonding are close to the lower welding limit for a thin Al plate with the two Mg alloys considered. These findings may contribute to improving the quality of materials welded with explosive welding.

scholarly journals Low Temperature Strain Rate Sensitivity of Titanium Alloys

2016 ◽  
Vol 258 ◽  
pp. 570-573 ◽  
Author(s):  
Héloise Vigié ◽  
Thalita de Paula ◽  
Martin Surand ◽  
Bernard Viguier
Keyword(s):  
Strain Rate ◽  
Titanium Alloys ◽  
Strain Rate Sensitivity ◽  
Constant Strain Rate ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Industrial Applications ◽  
Sustained Load ◽  
Dwell Fatigue ◽  
Wide Range

Titanium alloys are widely used in many industrial applications such as in aeronautics due to their combination of good mechanical properties, excellent corrosion resistance and low density. The mechanical behaviour of titanium alloys is known to exhibit a peculiar dependence on both deformation temperature and strain rate. Titanium alloys show significant room temperature creep and they are very sensitive to dwell fatigue and sustained load cracking. This behaviour is related to the viscosity of plastic deformation in titanium alloys, which can be represented by a strain rate sensitivity (SRS) parameter. The present study aims to compare the tensile behavior of two different titanium alloys, Ti-6Al-4V and β21S, which exhibit dissimilar microstructures. Results of tensile tests, performed under constant strain rate and including strain rate changes, are reported in terms of flow stress, ductility and SRS over a wide range of temperatures.

The crystal-chemistry of Vietnamese talcs from the Thanh Son district (Phu Tho province, Vietnam)

Clay Minerals ◽  
2015 ◽  
Vol 50 (5) ◽  
pp. 607-617 ◽  
Author(s):  
Angela Dumas ◽  
François Martin ◽  
The Ngo Ke ◽  
Hanh Nguyen Van ◽  
Dung Nguyen Viet ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nuclear Magnetic Resonance ◽  
Crystal Chemistry ◽  
Industrial Applications ◽  
Crystal Chemical ◽  
Chemical Analyses ◽  
X Ray Diffraction ◽  
Ore Deposit ◽  
X Ray ◽  
Wide Range

AbstractThe mineralogy and crystal chemistry of a new talc ore deposit situated at Thu Ngac commune, Thanh Son district, Phu Tho province, Vietnam, was investigated using X-ray fluorescence, electron microprobe, X-ray diffraction, Fourier transform infrared spectroscopy, solid-state nuclear magnetic resonance (29Si and1H) and colorimetry.Both chemical and crystal-chemical analyses showed that the talcs from the Phu Tho province are very pure because they contain few accessory minerals (chlorite, amphibole and goethite) and few substitutions of Si by Fe and Al in their crystal structure. The talc ore may well meet the standards required for a wide range of industrial applications.

Effect of high temperature heat treatment on the microstructure and mechanical properties of third generation SiC fibers

2013 ◽  
Vol 1514 ◽  
pp. 131-137
Author(s):  
Dominique Gosset ◽  
Aurélien Jankowiak ◽  
Thierry Vandenberghe ◽  
Maud Maxel ◽  
Christian Colin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Anisotropy Parameter ◽  
Tensile Tests ◽  
Heat Treatments ◽  
Neutral Atmosphere ◽  
X Ray Diffraction ◽  
Sic Fibers ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Temperature Heat Treatment

ABSTRACTSiC fibers (High Nicalon S -HNS and Tyranno SA3 -Ty-SA3) submitted to heat treatments in neutral atmosphere up to 1900°C were studied by X-ray diffraction (XRD) and TEM observations then submitted to tensile tests up to 1800°C. The microstructural changes in both materials were determined by XRD using a modified Hall-Williamson method introducing an anisotropy parameter taking into account the high density of planar defects of the SiC-3C structure. HNS fibers exhibit significant modifications in the CDD size which drastically increases from 24 nm to 70 nm in the range 1600°C to 1800°C and in the microstrains which decrease from 0.0015 to 0.0005 between 1750°C to 1850°C. Concerning the Ty-SA3 fibers, no evolution of CDD size and microstrains has been observed. The mechanical properties of single fibers were investigated after the heat treatments showing decreases in the tensile strength reaching up to 20% for Tyranno SA3 and 50% for High Nicalon S. The Weibull moduli were also significantly affected. These results are correlated to the fiber structural and microstructural evolutions.

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