scholarly journals Mechanical Performance of Zr-Containing 354-Type Al-Si-Cu-Mg Cast Alloy: Role of Additions and Heat Treatment

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
M. H. Abdelaziz ◽  
H. W. Doty ◽  
S. Valtierra ◽  
F. H. Samuel
Keyword(s):  
Intermetallic Compounds ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Base Alloy ◽  
Cast Alloy ◽  
Impact Properties ◽  
Percentage Volume ◽  
Eutectic Si ◽  
Iron Phase ◽  
The Impact

In this article, the volume fraction of intermetallic compounds in Zr-containing 354-type Al-Si-Cu-Mg alloys, characteristics of eutectic Si particles, and tensile, hardness, and impact properties have been evaluated with varying Ni and Mn contents and combination. The results revealed that additions of Ni and Mn in different amounts and combinations increased the volume fraction of intermetallic compounds in the tailored alloys, compared to the base alloy (cf. 12.21% for 4% Ni-containing alloy with 2.5% for base alloy), producing a significant effect on the mechanical performance. The proposed additions enhanced the mechanical performance of the alloys, namely, the ambient- and elevated-temperature tensile properties, hardness values, and impact properties. For the Mn-containing alloys, the improvement in properties was attributed to the formation of sludge particles in the form of blocky α-Al15(Fe,Mn)3Si2 alongside the script-like α-iron phase that resisted crack propagation. The precipitation of Ni-bearing phases such as Al9FeNi, Al3CuNi, and Al3Ni in the Ni-containing alloys improved the mechanical properties through hindering cracks propagation. Interestingly, addition of 0.75 wt.% Mn to the base alloy proved to be competitive in strength values to the addition of 2 and 4 wt.% Ni, and better in terms of ductility values. The investigations showed that the variations in hardness and impact values follow the same trend as variations in the percentage volume fraction of intermetallic compounds, i.e., maximum property value is associated to the alloy with highest volume fraction of intermetallic compounds. Furthermore, the impact properties showed higher dependency on Al2Cu phase particles rather than the eutectic Si particles.

scholarly journals Effect of Submicron Glass Fiber Modification on Mechanical Properties of Short Carbon Fiber Reinforced Polymer Composite with Different Fiber Length

2020 ◽  
Vol 4 (1) ◽  
pp. 5
Author(s):  
Nhan Thi Thanh Nguyen ◽  
Obunai Kiyotaka ◽  
Okubo Kazuya ◽  
Fujii Toru ◽  
Shibata Ou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Fiber Length ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Fiber Concentration ◽  
Static Tests ◽  
The Impact

In this research, three kinds of carbon fiber (CF) with lengths of 1, 3, and 25 mm were prepared for processing composite. The effect of submicron glass fiber addition (sGF) on mechanical properties of composites with different CF lengths was investigated and compared throughout static tests (i.e., bending, tensile, and impact), as well as the tension-tension fatigue test. The strengths of composites increased with the increase of CF length. However, there was a significant improvement when the fiber length changed from 1 to 3 mm. The mechanical performance of 3 and 25 mm was almost the same when having an equal volume fraction, except for the impact resistance. Comparing the static strengths when varying the sGF content, an improvement of bending strength was confirmed when sGF was added into 1 mm composite due to toughened matrix. However, when longer fiber was used and fiber concentration was high, mechanical properties of composite were almost dependent on the CF. Therefore, the modification effect of matrix due to sGF addition disappeared. In contrast to the static strengths, the fatigue durability of composites increased proportionally to the content of glass fiber in the matrix, regardless to CF length.

A Comparison of the Tribo-Mechanical Properties of a Wear Resistant Cobalt-Based Alloy Produced by Different Manufacturing Processes

2007 ◽  
Vol 129 (3) ◽  
pp. 586-594 ◽  
Author(s):  
H. Yu ◽  
R. Ahmed ◽  
H. de Villiers Lovelock
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Wear Mechanisms ◽  
Sliding Wear ◽  
Mechanical Performance ◽  
Cast Alloy ◽  
Processing Route ◽  
Structure Property ◽  
Wear Resistant ◽  
The Impact

This paper aims to compare the tribo-mechanical properties and structure–property relationships of a wear resistant cobalt-based alloy produced via two different manufacturing routes, namely sand casting and powder consolidation by hot isostatic pressing (HIPing). The alloy had a nominal wt % composition of Co–33Cr–17.5W–2.5C, which is similar to the composition of commercially available Stellite 20 alloy. The high tungsten and carbon contents provide resistance to severe abrasive and sliding wear. However, the coarse carbide structure of the cast alloy also gives rise to brittleness. Hence this research was conducted to comprehend if the carbide refinement and corresponding changes in the microstructure, caused by changing the processing route to HIPing, could provide additional merits in the tribo-mechanical performance of this alloy. The HIPed alloy possessed a much finer microstructure than the cast alloy. Both alloys had similar hardness, but the impact resistance of the HIPed alloy was an order of magnitude higher than the cast counterpart. Despite similar abrasive and sliding wear resistance of both alloys, their main wear mechanisms were different due to their different carbide morphologies. Brittle fracture of the carbides and ploughing of the matrix were the main wear mechanisms for the cast alloy, whereas ploughing and carbide pullout were the dominant wear mechanisms for the HIPed alloy. The HIPed alloy showed significant improvement in contact fatigue performance, indicating its superior impact and fatigue resistance without compromising the hardness and sliding∕abrasive wear resistance, which makes it suitable for relatively higher stress applications.

Epoxy-matrix nanocomposites reinforced by electrospun polymeric nanofibrous layers: PAN, PA-6,6, and hybrid PAN/PA-6,6

2021 ◽  
pp. 095440622110426
Author(s):  
Farzin Asghari Arpatappeh ◽  
Ali Akbar Gharehaghaji ◽  
Hooshang Nosraty
Keyword(s):  
Epoxy Matrix ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Electrospun Nanofiber ◽  
The Matrix ◽  
Low Volume ◽  
Enhanced Properties ◽  
The Impact ◽  
Matrix Nanocomposites ◽  
Advanced Applications

Composite materials with nanofibrous reinforcements are capable of high mechanical performance and enhanced properties despite their low volume fraction of reinforcement. In this study, tensile properties of epoxy-matrix nanocomposites were investigated after reinforcing by hand layup method implementation of randomly oriented electrospun nanofiber layers. The reinforcements were produced from polyacrylonitrile (PAN), Polyamide-6,6 (PA-6,6), and their 50/50 hybrid. The results indicated that PAN enhanced the tensile toughness of the matrix by almost 4 times, increasing both the ductility (an expected 23% due to fiber being more elastic than the matrix) and the ultimate tensile strength (a surprising 35% even though the fibers were less stiff than the matrix). These results indicate significant improvements in the impact properties for advanced applications. The results revealed that PA-6,6 did not show the characteristics of a promising reinforcement whether used solely or added to PAN.

scholarly journals The Low Velocity Impact Properties of Pandanus Fiber Composites

2017 ◽  
Vol 895 ◽  
pp. 56-60 ◽  
Author(s):  
Hoo Tien Nicholas Kuan ◽  
Meng Chuen Lee ◽  
Amir Azam Khan ◽  
Marini Sawawi
Keyword(s):  
Impact Loading ◽  
Volume Fraction ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Impact Properties ◽  
Velocity Impact ◽  
Impact Performance ◽  
Biodegradable Composites ◽  
Penetration Tests ◽  
The Impact

The impact properties of biodegradable Pandanus atrocarpus composite laminate is studied. Laminate samples were fabricated using a hot compression molding technique with high-density polyethylene and extracted Pandanus fiber. Pandanus composites were tested under impact loading in order to study their relative impact performance. Under low velocity impact loading, Pandanus fiber laminates offered an excellent resistance to impact penetration. Tests have shown that increasing the volume fraction of Pandanus fiber can enhance the toughness of the composite. The biodegradable composites imply attractive properties that may be accessible for use in engineering sectors.

Relation between Impact Properties and Interfacial Strength of UHMWPE/VE Composites

2011 ◽  
Vol 284-286 ◽  
pp. 161-164
Author(s):  
Chun Ying Min ◽  
Hao Jie Song ◽  
Peng Han ◽  
Lei Chen ◽  
Liang Sen Liu
Keyword(s):  
Energy Absorption ◽  
Volume Fraction ◽  
Interfacial Strength ◽  
Woven Fabric ◽  
Impact Properties ◽  
Interfacial Bonding Strength ◽  
Polyethylene Fiber ◽  
Matrix Volume ◽  
The Matrix ◽  
The Impact

This study presents impact properties and interfacial strength of Ultra-high molecular weight polyethylene fiber plain woven fabric reinforced vinyl ester composites with different matrix volume fraction. The interfacial strength was found to be decreased by reducing the matrix volume fraction. Stress, strain and energy absorption per thickness in the impact process were evaluated and the relation between these impact parameters and interfacial strength of the laminates were investigated. The maximum stress was decreased and the maximum strain was increased with the drop of interfacial bonding strength. The experiment results also revealed that the sample with a matrix volume fraction 23% showed higher energy absorption than other ones.

Measurement of Hardness and Wear Properties of Al Alloy with Addition of Ni

2015 ◽  
Vol 813-814 ◽  
pp. 190-194
Author(s):  
Raj A. Nidhin ◽  
R. Sellamuthu
Keyword(s):  
Wear Rate ◽  
Electric Furnace ◽  
Aging Temperature ◽  
Base Alloy ◽  
Optical Microscope ◽  
Al Alloy ◽  
Wear Properties ◽  
Ni Addition ◽  
Eutectic Si ◽  
The Impact

An investigation on the impact of aging on the hardness and wear properties of the Al-Mg-Si alloy with Ni addition was carried out. Al base alloy was melted in an electric furnace and 10wt%Ni was added to the melt. The melt was cast in a metal mould. The cast specimens were solutionized and aged at various temperatures. The microstructure was observed using an optical microscope. The hardness, wear rate and CoF were determined. The eutectic Si morphology was refined. An optimum aging temperature (165 °C) was found to exist for the Ni-modified alloy. The hardness increased (by 4.5%), wear rate decreased (by 96%) and CoF remained at a constant value for the Ni modified alloy compared to the base alloy. It is concluded that the Ni addition significantly improves the properties of the base alloy.

Relation between Interfacial Strength and Impact Properties of UHMWPE/LLDPE Laminates

2010 ◽  
Vol 150-151 ◽  
pp. 926-929
Author(s):  
Lei Chen ◽  
Jia Lu Li ◽  
Zhi Wei Xu ◽  
Liang Sen Liu
Keyword(s):  
Bonding Strength ◽  
Volume Fraction ◽  
Interfacial Strength ◽  
Woven Fabric ◽  
Interface Bonding ◽  
Impact Properties ◽  
Polyethylene Fiber ◽  
Matrix Volume ◽  
The Impact ◽  
Interface Bonding Strength

Ultra-high molecular weight polyethylene fiber plain woven fabric reinforced line-low-density polyethylene composites with different matrix volume fraction were prepared. The interfacial bonding strength and the impact property of the laminates were investigated. The experiment results revealed that the sample with a matrix volume fraction 14% showed better impact properties than other ones, while the interface bonding strength continued to drop when the matrix volume fraction was decreased. It is also indicated that in high fiber interface bonding strength, the impact resistance of the laminate would grow by decreasing the interface bonding strength. However, when the interface bonding strength was lower than the threshold, there would be an opposite effect.

Influence of the Porous Volume in the Structure of Resin Bond Composite Abrasives by its Mechanical Performance

2020 ◽  
Author(s):  
Matheus de Mendonça Chitan ◽  
Katia Cristiane Gandolpho Candioto
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Young’S Modulus ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Young's Modulus ◽  
Low Cost ◽  
Polymeric Materials ◽  
Porous Volume ◽  
The Impact

Abstract Abrasive tools consist of abrasive grains, binder and pores. Binders are the matrix of the material and may be of the metallic, vitrified or resin type. The wide use of polymeric materials (resinoid) is due to their low cost and excellent mechanical properties. The grain has the function of roughing the material, the binder, on the other hand, has the characteristics of ensuring grain adhesion and the pores in the structure are responsible for cooling the abrasive tool. In this work, we report the preparation and evaluation of the mechanical characteristics of resin bond composite abrasives with different structures based on the porous concentration. The composite abrasives were made with phenolic resin and alumina grains. Four different structures were studied from 10 to 30% of porous volume fraction with 50% of grain volume fraction. The concentration of porous and bond in the structure composition were employed to compare the mechanical performance of the prepared composite abrasive. To evaluate the mechanical properties of composites, Impact strength, Young’s Modulus by impulse excitation and flexural strength were realized. It was observed that as the porosity is higher, the impact resistance (absorbed energy) is lower, which confirms the lower resistance produced by the surface area contact (grain/binder) and a greater accumulation of tension in the binder material, the higher porosity value, higher the flexural strength value until 20% of porosity. Samples with higher volumes level of porosity presented lower Young’s Modulus but the presence of pores produced by volatiles by-products (mainly water) should act as stress concentrators, thus favoring lower mechanical properties at the resin-grain interface.

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