scholarly journals Enhancing Properties of Aerospace Alloy Elektron 21 Using Boron Carbide Nanoparticles as Reinforcement

2019 ◽  
Vol 9 (24) ◽  
pp. 5470
Author(s):  
Sravya Tekumalla ◽  
Ng Joo Yuan ◽  
Meysam Haghshenas ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Boron Carbide ◽  
Compressive Loading ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Thermal Insulating ◽  
Damping Characteristics ◽  
B4c Particles ◽  
Superior Mechanical Properties ◽  
Melt Deposition

In this study, the effect of nano-B4C addition on the property profile of Elektron 21 (E21) alloys is investigated. E21 reinforced with different amounts of nano-size B4C particulates was synthesized using the disintegrated melt deposition technique followed by hot extrusion. Microstructural characterization of the developed E21-B4C composites revealed refined grains with the progressive addition of boron carbide nanoparticles. The evaluation of mechanical properties indicated a significant improvement in the yield strength of the nanocomposites under compressive loading. Further, the E21-2.5B4C nanocomposites exhibited the best damping characteristics, highest young’s modulus, and highest resistance to ignition, thus featuring all the characteristics of a material suitable for several aircraft applications besides the currently allowed seat frames. The superior mechanical properties of the E21-B4C nanocomposites are attributed to the refined grain sizes, uniform distribution of the nanoparticles, and the thermal insulating effects of nano-B4C particles.

Enhancing Mechanical Properties of AZ31 Magnesium Alloy Through Simultaneous Addition of Aluminum and Nano-Al2O3

2010 ◽  
Author(s):  
S. Han ◽  
M. E. Alam ◽  
A. M. S. Hamouda ◽  
Q. B. Nguyen ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Coefficient Of Thermal Expansion ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Az31 Alloy ◽  
Deposition Technique ◽  
The Matrix ◽  
Characterization Studies ◽  
Melt Deposition ◽  
Work Of Fracture

In the present study, AZ31-Al2O3-Al magnesium nano-composites were successfully synthesized using an innovative disintegrated melt deposition technique followed by hot extrusion. Microstructural characterization studies revealed uniaxial grain size, reasonably uniform distribution of particulates/intermetallics in the matrix and minimal porosity. Physical properties characterization revealed that addition of both nano-Al2O3 and Al reduced the coefficient of thermal expansion (CTE) of monolithic AZ31. The presence of both Al2O3 particulates and aluminum also assisted in improving overall mechanical properties including microhardness, UTS, ductility and work of fracture of AZ31. The results suggest that these composites have significant potential in diverse engineering applications when compared to AZ31 alloy.

Using Micro-Alloying (0.5Zr-0.4Ce) to Significantly Enhance Hardness, Tensile and Compressive Response of Magnesium

2018 ◽  
Vol 928 ◽  
pp. 177-182
Author(s):  
Sravya Tekumalla ◽  
Wei Yang ◽  
Manoj Gupta
Keyword(s):  
Compressive Loading ◽  
Hot Extrusion ◽  
Optical Microscope ◽  
Deposition Method ◽  
Correlation Studies ◽  
Compressive Response ◽  
Superior Mechanical Properties ◽  
Melt Deposition ◽  
Microstructural Studies ◽  
Strength And Ductility

A ternary micro Mg-0.5Zr-0.4Ce alloy is developed using disintegrated melt deposition method (DMD) followed by hot extrusion. The developed alloy exhibited superior mechanical properties i.e. microhardness, strength and ductility under tensile and compressive loading. In particular, the alloy exhibits excellent ductility (>25%) under both tensile and compressive loading. The mechanisms leading to strengthening and ductilization were examined through microstructural studies involving optical microscope, SEM and XRD texture analysis. Microstructure-property correlation studies are performed to understand these mechanisms.

Development of Al-Mg Based Composites Containing Nanometric Alumina Using the Technique of Disintegrated Melt Deposition

2005 ◽  
Vol 23 ◽  
pp. 159-162 ◽  
Author(s):  
K.F. Ho ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Dominant Role ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Magnesium Content ◽  
Characterization Studies ◽  
Mechanical Properties Characterization ◽  
Melt Deposition ◽  
Composite Samples

In this study, composites based on Al-Mg/Al2O3 formulation were fabricated using an innovative solidification route followed by hot extrusion. The studies clearly indicate an increase in retention of nanometric alumina with an increase in magnesium content. Microstructural characterization studies of the extruded composite samples displayed fairly uniform distribution of reinforcement phases and minimal porosity. Results of mechanical properties characterization showed that a cumulative increase in magnesium and nanometric alumina content led to an increase in elastic modulus, 0.2% YS and UTS while the ductility of the composite was adversely affected. A comparison between monolithic Al-3.8Mg and Al-3.4Mg/1.4Al2O3 revealed that the presence of nanometric alumina play a dominant role in realizing a significant increase in elastic modulus, 0.2%YS and UTS of the composites.

scholarly journals Corrosion Behavior, Microstructure and Mechanical Properties of Novel Mg-Zn-Ca-Er Alloy for Bio-Medical Applications

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 519
Author(s):  
Devadas Bhat Panemangalore ◽  
Rajashekhara Shabadi ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Corrosion Behavior ◽  
Base Material ◽  
Hot Extrusion ◽  
Secondary Phases ◽  
Zinc Alloys ◽  
Alloying Additions ◽  
Degradation Rates ◽  
Master Alloys ◽  
Melt Deposition

In this study, the effect of calcium (Ca) and erbium (Er) on the microstructure, mechanical properties, and corrosion behavior of magnesium-zinc alloys is reported. The alloys were prepared using disintegrated melt deposition (DMD) technique using the alloying additions as Zn, Ca, and Mg-Er master alloys and followed by hot extrusion. Results show that alloying addition of Er has significantly reduced the grain sizes of Mg-Zn alloys and also when compared to pure magnesium base material. It also has substantially enhanced both the tensile and the compressive properties by favoring the formation of MgZn2 type secondary phases that are uniformly distributed during hot-extrusion. The quaternary Mg-Zn-Ca-Er alloy exhibited the highest strength due to lower grain size and particle strengthening due to the influence of the rare earth addition Er. The observed elongation was a result of extensive twinning observed in the alloys. Also, the degradation rates have been substantially reduced as a result of alloying additions and it is attributed to the barrier effect caused by the secondary phases.

scholarly journals Enhancing Mechanical Response of Monolithic Magnesium Using Nano-NiTi (Nitinol) Particles

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1014 ◽  
Author(s):  
Gururaj Parande ◽  
Vyasaraj Manakari ◽  
Saif Wakeel ◽  
Milli Kujur ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Mechanical Response ◽  
Hot Extrusion ◽  
Nickel Titanium ◽  
Structure Property ◽  
Microstructural Characteristics ◽  
Magnesium Matrix ◽  
Melt Deposition ◽  
Synthesized Materials ◽  
Minimal Adverse Effect

The present study focuses on investigating the effects of Nickel-Titanium (NiTi) nanoparticles on the microstructure and properties of pure Mg. Mg composites containing varying weight percentages (0.5, 1, 1.5, 3) of NiTi nanoparticles were fabricated using Disintegrated Melt Deposition (DMD), followed by hot extrusion. The synthesized materials were characterized in order to investigate their physical, microstructural and mechanical properties. Synthesized materials were characterized for their density and porosity levels, microstructural characteristics, and mechanical response. Superior grain refinement was realized by the presence of NiTi nanoparticles in the magnesium matrix. The addition of NiTi nanoparticles resulted in strength property enhancements of pure Mg with minimal adverse effect on the ductility. Structure-property evaluations are detailed in the current study.

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HYPEREUTECTIC Al-Si/AlNp COMPOSITE

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1377-1382 ◽  
Author(s):  
SEULKI PARK ◽  
JINMYUNG CHOI ◽  
BONGGYU PARK ◽  
IKMIN PARK ◽  
YONGHO PARK ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Dispersive Spectrometer ◽  
Microstructural Characterization ◽  
Weight Fraction ◽  
Reinforcement Particle ◽  
Hot Press ◽  
X Ray Diffraction ◽  
X Ray ◽  
Superior Mechanical Properties ◽  
Phase Evaluation

Hypereutectic Al - Si alloys with fine and evenly distributed Si precipitates have superior mechanical properties In this study, hypereutectic Al - Si alloy powders which contained 15 and 20wt% Si were prepared by a gas atomization process. 1, 3 and 5wt% AlN particles were blended with the Al - Si alloy powders using turbular mixer. The mixture was consolidated by Hot Press at 550°C for 1h under 60MPa. Relative density of the sintered samples was about 98% of theoretical density. This study was investigated by two ways. One is the effect of reinforcement weight fraction and the other is the effect of Silicon contents on the mechanical properties of the composite. Microstructural characterization and phase evaluation were carried out using X-ray Diffraction, Scanning Electron Microscopy equipped with Energy Dispersive Spectrometer. The results showed that the smaller the reinforcement particle size was and the better its distribution was, the higher ultimate tensile strength and hardness were.

scholarly journals A Novel Method of Light Weighting Aluminium Using Magnesium Syntactic Composite Core

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 917
Author(s):  
Penchal Reddy Matli ◽  
Joshua Goh Yong Sheng ◽  
Gururaj Parande ◽  
Vyasaraj Manakari ◽  
Beng Wah Chua ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Hybrid Composite ◽  
Compressive Loading ◽  
Core Region ◽  
Core Material ◽  
Novel Method ◽  
Light Weighting ◽  
Melt Deposition ◽  
Shell Region

In this study, hybrid composite consisting of aluminium (Al) shell and magnesium/glass microballoon (Mg-20 wt.% GMB) syntactic composite core was fabricated in a shell-core pattern by combining powder metallurgy and disintegrated melt deposition (DMD) techniques. Physical, microstructural and mechanical properties of as-cast Al and Al/Mg-20GMB hybrid composite were examined. Approximately 13% reduction in density (with respect to aluminium) was realized through the use of a syntactic composite core. Microstructural investigations revealed reasonable interfacial integrity between aluminium shell and Mg-GMB core material and the presence of Al, Mg and GMB phases. The interface region showed a hardness of 109 ± 2 Hv in comparison to the hardness of Al shell region (68 ± 4 Hv) and Mg-20GMB core region (174 ± 5 Hv). In comparison to as-cast Al, the yield strength and ultimate compressive strength of the as-cast Al/Mg-20GMB hybrid composite increased by ~65.4% and ~60%, respectively. Further, the energy absorption under compressive loading for the Al/Mg-20GMB hybrid composite was ~26% higher compared to pure Al. This study validated that Al/Mg-20GMB hybrid composite with superior absolute and specific mechanical properties can be fabricated and used for weight critical applications.

Conquering the Low-k Death Curve: Insulating Boron Carbide Dielectrics with Superior Mechanical Properties

2016 ◽  
Vol 2 (7) ◽  
pp. 1600073 ◽  
Author(s):  
Bradley J. Nordell ◽  
Thuong D. Nguyen ◽  
Christopher L. Keck ◽  
Shailesh Dhungana ◽  
Anthony N. Caruso ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Boron Carbide ◽  
Superior Mechanical Properties ◽  
Low K

Microstructural Characterization and Mechanical Properties of Mg-Zr-Ca Alloys Prepared by Hot-Extrusion for Biomedical Applications

2011 ◽  
Vol 4 (8) ◽  
pp. 2860-2863 ◽  
Author(s):  
Ying-Long Zhou ◽  
Dong-Mei Luo ◽  
Wang-Yu Hu ◽  
Yuncang Li ◽  
Peter Hodgson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Hot Extrusion ◽  
Microstructural Characterization

Influence of Cerium on the Deformation and Corrosion of Magnesium

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Sravya Tekumalla ◽  
Sankaranarayanan Seetharaman ◽  
Nguyen Quy Bau ◽  
Wai Leong Eugene Wong ◽  
Chwee Sim Goh ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electron Microscope ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Xrd Analysis ◽  
Compressive Deformation ◽  
Heat Treated ◽  
Before And After ◽  
Elongation To Failure ◽  
Melt Deposition

In this study, a new magnesium (Mg) alloy containing 0.4% Ce was developed using the technique of disintegrated melt deposition followed by hot extrusion. The tensile and compressive properties of the developed Mg–0.4Ce alloy were investigated before and after heat treatment with an intention of understanding the influence of cerium on the deformation and corrosion of magnesium. Interestingly, cerium addition has enhanced the strength (by 182% and 118%) as well as the elongation to failure of Mg (by 93% and 8%) under both tensile and compressive loadings, respectively. After heat treatment, under compression, the Mg–0.4Ce(S) alloy exhibited extensive plastic deformation which was 80% higher than that of the as-extruded condition. Considering the tensile and compressive flow curves, the as-extruded Mg–0.4Ce and the heat treated Mg–0.4Ce(S) alloys exhibited variation in the nature and shape of the curves which indicates a disparity in the tensile and compressive deformation behavior. Hence, these tensile and compressive deformation mechanisms were studied in detail for both as-extruded as well as heat treated alloys with the aid of microstructural characterization techniques (scanning electron microscope (SEM), transmission electron microscope (TEM), selective area diffraction (SAD), and X-ray diffraction (XRD) analysis. Furthermore, results of immersion tests of both as-extruded and heat treated alloys revealed an improved corrosion resistance (by ∼3 times in terms of % weight loss) in heat treated state vis-a-vis the as-extruded state.

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