The Effect of Ultrasonic Injection on the Microstructure and Mechanical Properties of A356 Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 3960-3965 ◽  
Author(s):  
Byoung Il Kang ◽  
Dae Gyun Ko ◽  
Jeong Il Youn ◽  
Young Jig Kim
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
A356 Alloy ◽  
Casting Process ◽  
Primary Phase ◽  
Eutectic Phase ◽  
Research Activities ◽  
Plate Shape ◽  
Casting Aluminum ◽  
Intense Research

A356 alloy is one of the wide used casting aluminum alloys and intense research activities of worldwide on casting process or refinement agent and procedure. In this study, we attempted refinement on Al primary phase and eutectic phase of A356 alloy by ultrasonic injection into the melts. The effect of ultrasonic injection into the melts could be summarized as follows: the morphology of the Al primary phase was refined and changed shape from dendritic to nondendritic and the eutectic phase of A356 was also refined and changed morphology from dendritic to plate shape.

The Effect of Ultrasonic Injection on the Microstructure and Mechanical Properties of A356 Alloy

2010 ◽  
Vol 89-91 ◽  
pp. 285-289
Author(s):  
Byoung Il Kang ◽  
Dae Gyun Ko ◽  
Jeong Il Youn ◽  
Young Jig Kim
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
A356 Alloy ◽  
Casting Process ◽  
Primary Phase ◽  
Eutectic Phase ◽  
Research Activities ◽  
Plate Shape ◽  
Casting Aluminum ◽  
Intense Research

A356 alloy is one of the wide used casting aluminum alloys and intense research activities of worldwide on casting process or refinement agent and procedure. In this study, we attempted refinement on Al primary phase and eutectic phase of A356 alloy by ultrasonic injection into the melts. The effect of ultrasonic injection into the melts could be summarized as follows: the morphology of the Al primary phase was refined and changed shape from dendritic to nondendritic and the eutectic phase of A356 was also refined and changed morphology from dendritic to plate shape.

The Effect of Scandium on the Mechanical Properties of A356 Aluminium Alloy

2016 ◽  
Vol 707 ◽  
pp. 144-147
Author(s):  
Ying Pio Lim ◽  
Wei Hong Yeo ◽  
A. Masita
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminium Alloy ◽  
Die Casting ◽  
A356 Alloy ◽  
Charpy Impact ◽  
Casting Process ◽  
Die Casting Process ◽  
Charpy Impact Strength ◽  
A356 Aluminium Alloy

In this project, the addition of scandium (Sc) into A356 aluminium alloy was studied for its effect on the mechanical properties after gravity die casting process. Scandium addition was administered at the weight percentages of 0.1, 0.2 and 0.3. The results obtained in this work revealed that scandium can significantly enhance the mechanical properties of A356 alloy in terms of tensile strength, hardness and charpy impact strength. In general, the addition of 0.2 wt% Sc in A356 alloy was found to be able to achieve the maximum tensile strength of 172.94MPa as compared to 136.03MPa for sample without Sc. No significant improvement in tensile strength was found when more than 0.3wt% added to the alloy. As for hardness, the sample with 0.3 wt% Sc attained the maximum Vicker’s hardness of 86.60 HV as compared to 76.48 HV for unmodified A356. Similarly, the addition of 0.3wt% Sc in A356 can achieve highest impact energy of 2.71J as compare to 1.09J for unmodified A356.

The Effect of Microalloying of Nickel, RRA Treatment on Microstructure and Mechanical Properties for High Strength Aluminum Alloy

2014 ◽  
Vol 925 ◽  
pp. 253-257 ◽  
Author(s):  
Haider T. Naeem ◽  
Kahtan S. Mohammad ◽  
Khairel R. Ahmad
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
High Strength ◽  
Casting Process ◽  
Direct Chill ◽  
Heat Treatments ◽  
Alloy Sample ◽  
Retrogression And Reaging ◽  
High Strength Aluminum Alloys ◽  
Direct Chill Casting Process

High strength aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni produced by semi-direct chill casting process were homogenized at different conditions then conducted heat treatment process which comprised pre-aging at 120°C for 24 h, retrogression at 180°C for 30 min, and then re-aging at 120°C for 24 h. Microstructural studies showed that add Ni (0.1 wt %) to the alloy will be forming Ni-rich phases such as AlCuNi, AlNi, AlNiFe and AlMgNi which provide a dispersive strengthening affected in the solid-solution and the subsequent heat treatments. The results showed that by this three-step process of heat treatments, the mechanical properties of aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni were substantially improved. The highest attain for the ultimate tensile strength and Vickers hardness for the alloy sample after applied the retrogression and reaging process is about 545 MPa and 237 HV respectively.

scholarly journals Hopeful high-strength casting alloys based on Al―Mg―Ge(Si) ternary systems

2020 ◽  
Vol 2020 (01) ◽  
pp. 55-66
Author(s):  
N. P. Korzhova ◽  
◽  
T. M. Legka ◽  
Y. V. Milman ◽  
K. E. Grinkevich ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Cast Alloy ◽  
High Strength ◽  
Ternary Systems ◽  
Eutectic Type ◽  
Eutectic Alloys ◽  
Binary Eutectic ◽  
Casting Aluminum ◽  
Multicomponent Eutectic

The relative analysis of phase equilibria in the Al-corner of the ternary phase diagrams of Al―Mg―Ge(Si) systems is carried out. Both systems are characterized by the presence of a quasi-binary cross-section of the eutectic type, which is shifted towards Mg-enriched alloys, and sufficiently width range existence of the univariant eutectic transformation L-Al + Mg2Ge(Si). The melting point of quasi-binary eutectic (-Al + Mg2Ge) in the Al―Mg–Ge system and (-Al + Mg2Si) in the Al―Mg―Si is 629 °С and 597 °С, respectively, and the content of the strengthening phase ((Mg2Ge or Mg2Si) in eutectics is 7% (vol.) и 13% (vol.). The properties of non-alloyed alloys with different volume content of eutectic are investigated and the basic compositions of alloys with the optimal strength/ductility ratio for subsequent doping are selected as well. Taking into account the coordinates of the corresponding eutectic transformations, the doping system with the participation of Zn, Cu and other elements is determined. The heat treatment regimes for multicomponent eutectic alloys were selected, to ensure precipitation of Zn(Cu)-nanoparticles that strengthen matrix solid solution. It was shown that according to the level of mechanical properties, these alloys belong to high-strength alloys with property ranges: -Al + Mg2Ge) ― В = 470―590 МPа, 0,2 = 350―520 МPа, = 8,0―15,5%; -Al + Mg2Si) ― В = 400―560 МPа, 0,2 = = 430―520 МPа, = 2,3–-4,5%. Using a complex U-like Nechenji―Kuptsov test, casting properties were determined and it was shown that the fluidity of (-Al + Mg2Si) alloy was 1,3 times higher than that of the AK7ch cast alloy. In terms of the combination of mechanical and casting properties, the new multicomponent eutectic alloys based on the Al―Mg―Ge(Si) ternary systems are superior to the best modern industrial casting aluminum alloys. Keywords: casting aluminum alloys, ternary Al―Mg―Ge(Si) systems, eutectic alloys, alloying, microstructure, mechanical properties, fluidity.

Criterion for oxides silumin castings contamination during chill casting

2021 ◽  
pp. 99-103
Author(s):  
O.A. Zarubina ◽  
A.M. Zarubin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Oxide Films ◽  
Casting Process ◽  
Chill Casting ◽  
Oxidation Processes ◽  
Mould Filling ◽  
Gas Tight ◽  
Cast Products ◽  
Modern Computing

To assess the effect of the mould filling modes on the content of oxide films in castings, special criterion is proposed that provides prediction in the contamination of chill castings mаde of aluminum alloys by using modern computing tools to simulate the moulds casting process on computer. It is noted that decrease in the value of the contamination criterion by using alloys with low content of Mg or without this component reduces the possibility of controlling the distribution of oxides in the casting, other elements of the casting mould and using the concentration of oxides, for example, in washers to control the mechanical properties of cast products. This is due to increase in the duration of oxidation processes in gas-tight mould with such change in the composition of the casting material.

scholarly journals Optimizing the Microstructure and Mechanical Properties of Vacuum Counter-Pressure Casting ZL114A Aluminum Alloy via Ultrasonic Treatment

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4232
Author(s):  
Gang Lu ◽  
Pengpeng Huang ◽  
Qingsong Yan ◽  
Pian Xu ◽  
Fei Pan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Ultrasonic Treatment ◽  
Eutectic Silicon ◽  
Primary Phase ◽  
Pressure Casting ◽  
Counter Pressure ◽  
Casting Aluminum Alloy ◽  
Casting Aluminum

The effect of ultrasonic temperature on density, microstructure and mechanical properties of vacuum counter-pressure casting ZL114A alloy during solidification was investigated by optical microscopy (OM), scanning electron microscope (SEM) and a tensile test. The results show that compared with the traditional vacuum counter-pressure casting aluminum alloy, the primary phase and eutectic silicon of the alloy with ultrasonic treatment has been greatly refined due to the dendrites broken by ultrasonic vibration. However, the refining effect of ultrasonic treatment on vacuum counter-pressure casting aluminum alloy will be significantly affected by ultrasonic temperature. When the ultrasonic temperature increases from 680 °C to 720 °C, the primary phase is gradually refined, and the morphology of eutectic silicon also changes from coarse needle-like flakes to fine short rods. With a further increase in the ultrasonic temperature, the microstructure will coarse again. The tensile strength and elongation of vacuum counter-pressure casting ZL114A alloy increases first and then decreases with the increase of ultrasonic temperature. The optimal mechanical properties were achieved with tensile strength of 327 MPa and the elongation of 5.57% at ultrasonic temperature of 720 °C, which is 6.3% and 8.2%, respectively, higher than that of alloy without ultrasonic treatment.

Microstructure and Mechanical Properties of Al Alloys by Semi-Solid Processing with LSPSF Technology

2009 ◽  
Vol 628-629 ◽  
pp. 477-482 ◽  
Author(s):  
Hong Min Guo ◽  
Xiang Jie Yang ◽  
J.X. Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Die Casting ◽  
High Strength ◽  
Casting Process ◽  
Homogeneous Distribution ◽  
Casting Alloy ◽  
Die Casting Process ◽  
Casting Industry ◽  
Semi Solid

Rheoforming is becoming the choice of the casting industry which relies on the semi-solid slurry for high integrity structural parts. The potential of rheoforming with LSPSF (Low superheat pouring with a shear field) for aluminum alloys was investigated in the present work. High quality semi-solid slurries of a series of aluminum alloys were manufactured by LSPSF process, such as casting alloy A356, high strength alloy 201, secondary die casting alloy A380 and wrought alloy 2024, 6082 and 7075, in which the primary α-Al presented spherical, small and homogeneous distribution, especially with zero-entrapped liquid. Applications of LSPSF in high pressure die casting process and squeeze casting process were presented. Results showed that LSPSF rheoforming could improve microstructures and increase mechanical properties.

On the complexity of the relationship between microstructure and tensile properties in cast aluminum

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540011 ◽  
Author(s):  
Anton Bjurenstedt ◽  
Salem Seifeddine ◽  
Anders E. W. Jarfors
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
High Performance ◽  
Casting Process ◽  
Process Quality ◽  
Material Strength ◽  
Process Conditions ◽  
Cast Aluminum ◽  
Handling Practices ◽  
The Relationship

The relationship between microstructure and mechanical properties in cast aluminum alloys is complex and is strongly affected by the casting process conditions and melt handling practices. The aim of the current work is to understand the critical interactions between material microstructure, mechanical properties and process quality in the development of high performance aluminum alloys. The mechanical properties were investigated and correlated with microstructural features such as porosity, Fe -rich particles, secondary dendrite arm spacing (SDAS) and Si -particle length. The correlation with process quality measures such as bifilm index, density index and sludge factor (SF) were also investigated. The Si -particle lengths were found to explain variation in material strength and ductility which factors such as the bifilm index and porosity could not.

Mechanical Properties of Large-Scale Extruded Mg-Zn-Y Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1541-1545 ◽  
Author(s):  
Yuichi Ienaga
Keyword(s):  
Mechanical Properties ◽  
Fatigue Strength ◽  
Aluminum Alloys ◽  
Large Scale ◽  
High Strength ◽  
Casting Process ◽  
High Heat ◽  
Stir Casting ◽  
Extrusion Ratio ◽  
High Heat Resistance

In order to realize large-scale Mg-Zn-Y alloys with high strength and high heat resistance, we have developed a unique casting process to produce a large homogeneous ingot investigating the mechanical properties of the extruded alloys. First homogeneous ingots (335 mm x 850 mm) were prepared by a unique stir casting process. Then large-scale extruded alloys (100 mm) were prepared at 648 K with the extrusion ratio of 10. The Mg-Zn-Y alloys have exhibited higher yield and fatigue strengths than those of aluminum alloys. The yield strengths of the aluminum alloys have decreased drastically above 473 K, whereas those of the Mg-Zn-Y alloys have not. It is noteworthy that the yield strength (200 MPa) and the fatigue strength (75 MPa) of the Mg-Zn-Y alloys at 523 K are about twice and 1.2-1.4 times as high as those of the aluminum alloys respectively. Moreover, the creep strengths have been equivalent or higher than those of aluminum alloys. From the above results, we have verified that even being made by the large-scale extrusion, the Mg-Zn-Y alloys possess higher strength than those of heat resistant aluminum alloys.

The Study of A356 Alloy Rheo-Squeeze Casting Process

2016 ◽  
Vol 256 ◽  
pp. 270-275
Author(s):  
Xiang Jie Yang ◽  
Yi He ◽  
Yong Bo Zhu ◽  
Chuan Lin Hu ◽  
Hong Min Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Squeeze Casting ◽  
A356 Alloy ◽  
Injection Pressure ◽  
Casting Process ◽  
High Quality ◽  
Injection Speed ◽  
Preheating Temperature ◽  
Squeeze Casting Process

In this paper, the castings of A356 alloy were made by the rheo-squeeze casting with slurry-making from the process of LSPSF. Experiments were designed to study the influence of three parameters in rheo-squeeze casting process, such as injection speed, mould preheating temperature and injection pressure, on castings performance. The results show that high-quality castings were produced with the injection speed of 0.5m/s ,the mould preheating temperature of 240°C, the injection pressure of 50MPa. The mechanical properties, such as the yield strength, tensile strength and elongation of the castings with T6 heat treatment are 241 MPa, 328MPa and 11.6%, respectively.

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