scholarly journals Effects of particle size, bimodality and heat treatment on mechanical properties of pumice reinforced aluminum syntactic foams produced by cold chamber die casting

China Foundry ◽  
2021 ◽  
Vol 18 (6) ◽  
pp. 529-540
Author(s):  
Çağın Bolat ◽  
İsmail Cem Akgün ◽  
Ali Gökşenli
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Particle Size ◽  
Die Casting ◽  
Syntactic Foams ◽  
Cold Chamber

Study on Microstructures and Mechanical Properties of Die Casting Mg-xGd-3Y-0.5Zr Alloys

2013 ◽  
Vol 690-693 ◽  
pp. 44-48
Author(s):  
Feng Wang ◽  
Zhi Wang ◽  
Zheng Liu ◽  
Ping Li Mao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Solution Heat Treatment ◽  
Die Casting ◽  
Solution Treatment ◽  
Small Variation ◽  
Strength Increase ◽  
Microstructures And Mechanical Properties ◽  
Zr Alloys

In this paper, developed a non-aluminum die casting magnesium alloys were studied based on Mg-xGd-Y-Zr（x=6, 8, 12 wt.%）alloys in cold chamber press. The microstructures and mechanical properties of die casting GWK alloys have been investigated using OM, SEM, XRD, EDS and mechanical property test. The experimental results show that with increasing Gd content of Mg-xGd-Y-Zr alloys, the tensile strength increase, but elongation decrease. In particular, die casting GWK alloys after short-term and low-temperature solid solution treatment (T4) have a small variation in grain size and more uniform microstructures, and the second phases distribute at the grain boundaries in form of discontinuous rod shape or granule shape, which result in an obvious improvement in tensile mechanical properties of alloys. The Mg-12Gd-3Y-0.5Zr die casting alloy exhibit maximum tensile strength after solution heat treatment, and the value is 269MPa at room temperature. The effect of solution heat treatment on die casting Mg-xGd-Y-Zr alloys was also discussed.

Effect of Heat Treatment Combined with High Pressure Torsion Process on Microstructure and Hardness of AlMg5Si2Mn Alloy

2018 ◽  
Vol 275 ◽  
pp. 89-99
Author(s):  
Przemysław Snopiński ◽  
Tomasz Tański
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Pressure ◽  
Electron Microscope ◽  
Aluminium Alloy ◽  
Potential Application ◽  
High Pressure Torsion ◽  
Die Casting ◽  
Casting Alloy ◽  
Heat Treated

This study evaluated the effect of a heat treatment on the potential application of AlMg5Si2Mn die casting alloy as a substitute for wrought aluminium alloy products. The proposed heat treatment was intended to increase the workability of the AlMg5Si2Mn alloy, which is typically not malleable due to the presence of interconnected brittle phases. By disintegrating interconnected eutectic Mg2Si phases into fragmented particles and dissolving Mg-rich phases the workability was increased. Subsequently, heat treated samples were subjected to high-pressure torsion process. The microstructure of the heat treated and deformed samples were characterized using light and electron microscope. Hardness measurements were used to investigate the influence the number of HPT revolutions on mechanical properties.

Effect of Glass Microballoons Size on Compressive Strength of Syntactic Foams

2011 ◽  
Vol 321 ◽  
pp. 7-10 ◽  
Author(s):  
Zhuo Chen ◽  
Zhi Xiong Huang ◽  
Yan Qin ◽  
Min Xian Shi ◽  
Qi Lin Mei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Compressive Strength ◽  
Size Distribution ◽  
Syntactic Foam ◽  
Syntactic Foams ◽  
Static Compression ◽  
Distribution Ranges ◽  
Glass Microballoons ◽  
Quasi Static Compression

In this work, syntactic foams made of microballoons having same wall thickness ratio but with different particle size was prepared. Microballoons of three size distribution ranges were selected .The property of the syntactic foams were studied by quasi-static compression test. The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly. The failure mode of the syntactic foams was also studied in this work.

Influence of hollow carbon microspheres of micro and nano-scale on the physical and mechanical properties of epoxy syntactic foams

RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 50919-50928 ◽  
Author(s):  
Xiudi Li ◽  
Ming Zhu ◽  
Xuemei Tang ◽  
Qingjie Zhang ◽  
Xiaoping Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Physical And Mechanical Properties ◽  
Syntactic Foams ◽  
Carbon Microspheres ◽  
Interfacial Interactions ◽  
Nano Scale ◽  
Hollow Carbon ◽  
Different Content ◽  
Hollow Carbon Microspheres

The introduction of hollow carbon microspheres at different content and particle size led to various impacts on the physical and mechanical properties of epoxy syntactic foams due to the diversity in the interfacial interactions and microstructure.

scholarly journals Effect of Injected Oxygen Amount on the Gas Porosity and Mechanical Properties of a Pore-Free Die-Cast Al–Si–Cu Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1805
Author(s):  
Ho-Jung Kang ◽  
Ho-Sung Jang ◽  
Seong-Hyo Oh ◽  
Pil-Hwan Yoon ◽  
Gyu-Heun Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Die Casting ◽  
High Vacuum ◽  
Distribution Analysis ◽  
T6 Heat Treatment ◽  
Gas Porosity ◽  
Before And After ◽  
Die Castings

With the rise in the demand for eco-friendly and electric vehicles, welding and heat treatment are becoming very important to meet the necessary weight reduction, complexity, and high functionality of die castings. Pore-free (PF) die casting is an effective process that enables heat treatment and welding due to low gas porosities. Indeed, this process affords castings of low gas porosity, similar to those attained by high-vacuum die casting. In this study, we compared the gas porosities of different castings fabricated by PF die casting using varied injected oxygen amounts. The castings were all subjected to T6 heat treatment and analyzed by computed tomography (CT) to compare their microstructure and mechanical properties before and after T6 heat treatment. The results revealed that with the increasing injected oxygen amount, the gas porosity of the specimens decreased while their mechanical properties increased. In particular, the gas porosity was the lowest at 1.26 L. Moreover, the 1.26 L specimen displayed the best tensile strength, yield strength, and elongation results. Finally, Weibull distribution analysis revealed that the tensile strength and elongation repeatability and reproducibility increased with increasing injected oxygen amount.

RESEARCH ON ALLOYING TECNIQUES OF MISCHMETAL IN DIE CASTING MAGNESIUM ALLOY

2009 ◽  
Vol 23 (06n07) ◽  
pp. 832-837 ◽  
Author(s):  
YULEI XU ◽  
KUI ZHANG ◽  
XINGGANG LI ◽  
KANG ZHANG ◽  
JIAN LEI ◽  
...  
Keyword(s):  
Particle Size ◽  
Melting Point ◽  
Magnesium Alloy ◽  
Master Alloy ◽  
Die Casting ◽  
Casting Temperature ◽  
Grain Refining ◽  
Az91d Magnesium Alloy ◽  
Lower Melting Point ◽  
Cold Chamber

An aim of the experiments is to study alloying techniques of dollop-like MM , as-cast and extruded Mg - MM master alloy in die casting AZ91D magnesium alloy at conventional cold chamber die casting temperature. The as-cast AZ 91 D -1.2 wt % MM alloys were prepared and MM was added by different way at 720°C. The results showed that the efficiency of alloying achieved less than 50% within 30 min when dollop-like MM was added. When MM was added by as-cast and extruded Mg -21 wt % MM master alloy, the efficiency of alloying was improved significantly. The microstructure and analytical studies were carried out using optical microscopy and differential scanning calrimetry (DSC). Testing results showed the Mg - MM master alloy could melt easily down at die casting temperature because Mg - RE phases with lower melting point were formed. The grain refining efficiency of the master alloy was improved by extrusion. The improvement could be attributed to the decrease in Mg - RE particle size and increase in the number of nucleating sizes for Mg . Then die-casting AZ 91 D -0.44 wt % MM test bars were produced with addition of extruded Mg -21 wt % MM master alloy and the efficiency of alloying was around 80%.

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