Development and Characterization of Ductile Mg∕Y2O3 Nanocomposites

2007 ◽  
Vol 129 (3) ◽  
pp. 462-467 ◽  
Author(s):  
S. F. Hassan ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Powder Metallurgy Technique ◽  
Magnesium Matrix ◽  
Mechanical Properties Characterization ◽  
Reinforcement Distribution ◽  
Work Of Fracture

Nano-Y2O3 particulates containing ductile magnesium nanocomposites were synthesized using blend-press-sinter powder metallurgy technique followed by hot extrusion. Microstructural characterization of the nanocomposite samples showed fairly uniform reinforcement distribution, good reinforcement-matrix interfacial integrity, significant grain refinement of magnesium matrix with increasing presence of reinforcement, and the presence of minimal porosity. Mechanical properties characterization revealed that the presence of nano-Y2O3 reinforcement leads to marginal increases in hardness, 0.2% yield strength and ultimate tensile strength, but a significant increase in ductility and work of fracture of magnesium. The fracture mode was changed from brittle for pure Mg to mix ductile and intergranular in the case of nanocomposites.

scholarly journals Mechanical Characterization of Graphene Nanoplatelets-Reinforced Mg-3Sn Alloy Synthesized by Powder Metallurgy

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 62
Author(s):  
Pravir Kumar ◽  
Katerina Skotnicova ◽  
Ashis Mallick ◽  
Manoj Gupta ◽  
Tomas Cegan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Powder Metallurgy ◽  
Compressive Strain ◽  
Hot Extrusion ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Microstructural Characteristics

The present study investigated the effects of alloying and nano-reinforcement on the mechanical properties (microhardness, tensile strength, and compressive strength) of Mg-based alloys and composites. Pure Mg, Mg-3Sn alloy, and Mg-3Sn + 0.2 GNP alloy-nanocomposite were synthesized by powder metallurgy followed by hot extrusion. The microstructural characteristics of the bulk extruded samples were explored using X-ray diffraction, field-emission scanning electron microscopy, and optical microscopy and their mechanical properties were compared. The microhardness, tensile strength, and compressive strength of the Mg-3Sn alloy improved when compared to those of monolithic Mg sample and further improvements were displayed by Mg-3Sn + 0.2 GNP alloy-nanocomposite. No significant change in the compressive strain to failure was observed in both the alloy and the alloy-nanocomposite with respect to that of the pure Mg sample. However, an enhanced tensile strain to failure was displayed by both the alloy and the alloy-nanocomposite.

scholarly journals Mechanical Characterization of Graphene Nanoplatelets-Reinforced Mg-3Sn Alloy Synthesized by Powder Metallurgy

2020 ◽  
Author(s):  
Pravir Kumar ◽  
Katerina Skotnicova ◽  
Ashis Mallick ◽  
Manoj Gupta ◽  
Tomas Cegan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Powder Metallurgy ◽  
Compressive Strain ◽  
Hot Extrusion ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Microstructural Characteristics

The present study investigated the effects of alloying and nano-reinforcement on the mechanical properties (microhardness, tensile strength, and compressive strength) of Mg-based alloys and composites. Pure Mg, Mg-3Sn alloy, and Mg-3Sn+0.2GNP alloy-nanocomposite were synthesized by powder metallurgy followed by hot extrusion. The microstructural characteristics of the bulk extruded samples were explored using X-ray diffraction, field-emission scanning electron microscopy, and optical microscopy and their mechanical properties were compared. The microhardness, tensile strength, and compressive strength of the Mg-3Sn alloy improved when compared to those of monolithic Mg sample and further improvements were displayed by Mg-3Sn+0.2GNP alloy-nanocomposite. No significant change in the compressive strain to failure was observed in both the alloy and the alloy-nanocomposite with respect to that of the pure Mg sample. However, an enhanced tensile strain to failure was displayed by both the alloy and the alloy-nanocomposite.

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.

Characterization of Mg/MgO Nanocomposites Synthesized Using Powder Metallurgy Technique

Materials ◽  
2005 ◽  
Author(s):  
C. S. Goh ◽  
J. Wei ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Volume Fraction ◽  
Physical And Mechanical Properties ◽  
Thermomechanical Analysis ◽  
Powder Metallurgy Technique ◽  
Magnesium Matrix ◽  
Individual Particles ◽  
Threshold Amount

Magnesium nanocomposites with 0.1, 0.2, 0.3 and 0.4 volume percentages of MgO were synthesized using the powder metallurgy technique. The nanocomposite billets obtained were subsequently hot extruded at a temperature of 350 °C with an extrusion ratio of 20.25:1. The extruded nanocomposites were characterized for their microstructural, physical and mechanical properties. The microstructures of the nanocomposites showed individual particles of MgO uniformly distributed in the magnesium matrix. The thermomechanical analysis results revealed that a more thermally stable magnesium nanocomposite could be obtained with a threshold amount of MgO. The tensile properties results indicated that the yield strength peaks at 0.3 vol.% of reinforcement incorporated, with an improvement of approximately 17%. An attempt is made to correlate the volume fraction of the MgO with the resultant physical and mechanical properties of the magnesium nanocomposites.

Mechanical Properties and Microstructure of AM140 Magnesium Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 822-825
Author(s):  
Yong Jun Li ◽  
Kui Zhang ◽  
Xing Gang Li ◽  
Xin Zhao ◽  
Xu Jun Mi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Annealing Treatment ◽  
Hot Extrusion ◽  
Eutectic Phase ◽  
Optical Observation ◽  
Magnesium Matrix ◽  
Homogenization Treatment

The homogenization treatment, hot extrusion, and annealing treatment are carried out to study the effects of these processes on the mechanical properties and structure of AM140 magnesium alloy. The parameter of homogenization treatment (420°C× 24h) determined by DSC and metallurgical photo is sufficient which ensures the eutectic phase melt into magnesium matrix greatly. The Rm, Rp0.2 and A of billets after hot extrusion are 355MPa, 305MPa and 3.5% respectively. The variation of structure and mechanical properties during the process of aging is also studied by optical observation and tensile strength .

Creation of High Performance Mg Based Composite Containing Nano-Size Al2O3 Particulates as Reinforcement

2005 ◽  
Vol 23 ◽  
pp. 151-154 ◽  
Author(s):  
S.F. Hassan ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Strength ◽  
Microstructural Characterization ◽  
Weight Percentage ◽  
Magnesium Alloy Az91 ◽  
Mechanical Properties Characterization ◽  
Nano Size ◽  
Made In

Magnesium based composite with 2.5 weight percentage of nano-sized Al2O3 particulates reinforcement was fabricated using powder metallurgy technique. Al2O3 particulates with an equivalent size of 50-nm were used as reinforcement. Microstructural characterization of the materials revealed recrystallization and grain refinement due to the presence of nano-Al2O3. Mechanical properties characterization revealed that the presence of nano-Al2O3 particulates as reinforcement lead to a significant increase in hardness, elastic modulus, 0.2% yield strength and UTS and ductility of pure magnesium. The results revealed that the specific tensile properties of these materials are superior when compared to high strength magnesium alloy AZ91 reinforced with much higher weight percentage of SiC. An attempt is made in the present study to correlate the effect of nano-sized Al2O3 particulates as reinforcement with the microstructural and mechanical properties of magnesium.

Characterization of Pearlite Morphology and Associated Micro-Cracks in EN9 Grade Carbon Steel by Atomic Force Microscopy

2012 ◽  
Vol 585 ◽  
pp. 67-71 ◽  
Author(s):  
K. Chandra Sekhar ◽  
B.P. Kashyap ◽  
Sandeep Sangal
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Tensile Strength ◽  
Microstructural Characterization ◽  
Microstructural Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Micro Cracks ◽  
Matrix Properties

Micro and Nano Features of Microstructural Properties along with Micro-Cracks and Voids, which Severely Affect the Strength and Toughness of the Material, Were Studied in Commercial EN9 Steel Round Product by Using Atomic Force Microscopy (AFM). this Has Overcome the Limitations of Optical and Scanning Microscopy. the Aim of the Present Work Is to Characterize the Pearlite Matrix Properties for Nanoscale Results as Pearlitic Morphology and Lamellae Play a Significant Role in Influencing the Mechanical Properties. it Is Also Shown that the Atomic Force Microscope Is a 3D Characterizing Tool which Can Facilitate Visualizing the Adjacent Corners in Alternate Layers of Ferrite-Cementite Lamellae. it Is Also Noted that the Micro-Sized Cracks Exist at the Weak Interfaces between the Ferrite and Cementite Lamellae, which Would Limit the Work Hardening Property of Pearlite and Thus Reduce the Ultimate Tensile Strength Significantly. in Addition, Phase Transformation from γ-Phase to Pearlite Was Schematically Predicted and Discussed as Evident from Microstructural Characterization.

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.

Fabrication and Characterization of Biocomposite Using Grewia Optiva Fibre (i.e. Bhimal) Reinforced Polyvinyl Alcohol (PVA)

2015 ◽  
Vol 1105 ◽  
pp. 51-55 ◽  
Author(s):  
K.M. Gupta ◽  
Kishor Kalauni
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Fibre ◽  
Fabrication Method ◽  
View Point ◽  
Engineering Material ◽  
Fibre Composites ◽  
Grewia Optiva ◽  
Fabrication And Characterization

Bhimal fibres are quite a newer kind of bio-degradable fibres. They have never been heard before in literatures from the view point of their utility as engineering material. These fibres have been utilized for investigation of their properties. Characterization of this fibre is essential to determine its properties for further use as reinforcing fibre in polymeric, bio-degradable and other kinds of matrix. With this objective, the fabrication method and other mechanical properties of Bhimal-reinforced-PVA biocomposite have been discussed. The stress-strain curves and load-deflection characteristics are obtained. The tensile, compressive, flexure and impact strengths have been calculated. The results are shown in tables and graphs. The results obtained are compared with other existing natural fibre biocomposites. From the observations, it has been concluded that the tensile strength of Bhimal-reinforced-PVA biocomposite is higher than other natural fibre composites. Hence these can be used as reinforcement to produce much lighter weight biocomposites.

Vibratory weld conditioning during gas tungsten arc welding of al 5052 alloy on the mechanical and micro-structural behavior

2020 ◽  
Vol 17 (6) ◽  
pp. 831-836
Author(s):  
M. Vykunta Rao ◽  
Srinivasa Rao P. ◽  
B. Surendra Babu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Welded Joints ◽  
Great Influence ◽  
Welding Process ◽  
Microstructural Characterization ◽  
Content Type ◽  
Average Grain Size

Purpose Vibratory weld conditioning parameters have a great influence on the improvement of mechanical properties of weld connections. The purpose of this paper is to understand the influence of vibratory weld conditioning on the mechanical and microstructural characterization of aluminum 5052 alloy weldments. An attempt is made to understand the effect of the vibratory tungsten inert gas (TIG) welding process parameters on the hardness, ultimate tensile strength and microstructure of Al 5052-H32 alloy weldments. Design/methodology/approach Aluminum 5052 H32 specimens are welded at different combinations of vibromotor voltage inputs and time of vibrations. Voltage input is varied from 50 to 230 V at an interval of 10 V. At each voltage input to the vibromotor, there are three levels of time of vibration, i.e. 80, 90 and 100 s. The vibratory TIG-welded specimens are tested for their mechanical and microstructural properties. Findings The results indicate that the mechanical properties of aluminum alloy weld connections improved by increasing voltage input up to 160 V. Also, it has been observed that by increasing vibromotor voltage input beyond 160 V, mechanical properties were reduced significantly. It is also found that vibration time has less influence on the mechanical properties of weld connections. Improvement in hardness and ultimate tensile strength of vibratory welded joints is 16 and 14%, respectively, when compared without vibration, i.e. normal weld conditions. Average grain size is measured as per ASTM E 112–96. Average grain size is in the case of 0, 120, 160 and 230 is 20.709, 17.99, 16.57 and 20.8086 µm, respectively. Originality/value Novel vibratory TIG welded joints are prepared. Mechanical and micro-structural properties are tested.

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