Effect of the Pressure on Microstructure of A380 Aluminum Alloy Prepared by Squeeze Casting

2017 ◽  
Vol 735 ◽  
pp. 59-64
Author(s):  
Bai Shui Yu ◽  
Shu Ming Xing
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Squeeze Casting ◽  
Volume Fraction ◽  
Chinese Script ◽  
Squeeze Pressure ◽  
Tissue Volume ◽  
A380 Alloy ◽  
Solidification Pressure

Effects of the solidification pressure on microstructure and mechanical properties of A380 alloy have been experimentally investigated. The obtained results show that the microstructures of the A380 aluminum alloy is fined, the porosity is decreased and the mechanical properties is improved remarkably with the increase of the solidification pressure. When the squeeze pressure increases from 0 MPa to 75MPa, the size of dendrite arm space decreases from 914 μm to 313 μm, reduced by 66%; the eutectic tissue volume fraction increases from 22.5% to 41.36%; the porosity decreases from 4.91% to 1.23%; the secondary dendrite spacing decreases from 39 μm to 18 μm; the size of needle-like β-Al5FeSi phase decreases significantly, and a few Chinese script α-Fe phases was observed in the grain boundary.

scholarly journals Experimental Investigation and Optimization of the Semisolid Multicavity Squeeze Casting Process for Wrought Aluminum Alloy Scroll

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5278
Author(s):  
Yi Guo ◽  
Yongfei Wang ◽  
Shengdun Zhao
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Process Parameters ◽  
Squeeze Casting ◽  
Shrinkage Porosity ◽  
Optimal Process ◽  
Squeeze Pressure ◽  
Wrought Aluminum

Scroll compressors are popularly applied in air-conditioning systems. The conventional fabrication process causes gas and shrinkage porosity in the scroll. In this paper, the electromagnetic stirring (EMS)-based semisolid multicavity squeeze casting (SMSC) process is proposed for effectively manufacturing wrought aluminum alloy scrolls. Insulation temperature, squeeze pressure, and the treatment of the micromorphology and mechanical properties of the scroll were investigated experimentally. It was found that reducing the insulation temperature can decrease the grain size, increase the shape factor, and improve mechanical properties. The minimum grain size was found as 111 ± 3 μm at the insulation temperature of 595 °C. The maximum tensile strength, yield strength, and hardness were observed as 386 ± 8 MPa, 228 ± 5 MPa, and 117 ± 5 HV, respectively, at the squeeze pressure of 100 MPa. The tensile strength and hardness of the scroll could be improved, and the elongation was reduced by the T6 heat treatment. The optimal process parameters are recommended at an insulation temperature in the range of 595–600 °C and a squeeze pressure of 100 MPa. Under the optimal process parameters, scroll casting was completely filled, and there was no obvious shrinkage defect observed inside. Its microstructure is composed of fine and spherical grains.

scholarly journals Microstructures and Properties of V-Modified A380 Aluminum Alloy Produced by High Pressure Rheo-Squeeze Casting with Compound Field Treatment

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 587
Author(s):  
Chong Lin ◽  
Hanxin Chen ◽  
Li Zeng ◽  
Shusen Wu ◽  
Xiaogang Fang
Keyword(s):  
High Pressure ◽  
Aluminum Alloy ◽  
Fine Particle ◽  
Quality Index ◽  
Squeeze Casting ◽  
Volume Fraction ◽  
Average Length ◽  
Gravity Casting ◽  
A380 Alloy ◽  
Heat Treated

The melt of V-modified A380 alloy aluminum alloy was treated by compound field of ultrasonic vibration (UV) and electromagnetic stirring (ES) around liquidus temperatures. Then the high pressure rheo-squeeze casting (HPRSC) process was used to produce an ingot with the alloy melt obtained. The results indicate that the polygonal Si2V phase is precipitated after adding vanadium to the alloy. With the increasing of V content from 0 to 1.05%, the average length and volume fraction of β-Al5FeSi phase is decreased to 30 μm and 1.44%, respectively. The refinement effects of UV, ES, and UV-ES compound field on the microstructure of the gravity casting alloy are as follows: UV-ES > UV > ES. When the pressure is increased from 0 to 400 MPa, the size of primary α-Al is decreased gradually, the morphology of β-Al5FeSi phase is changed from an acicular to a fine fibrous-like one, and the polygonal Si2V phase is refined to fine particle with an average grain diameter of about 8 μm. The ultimate tensile strength (UTS), yield strength (YS), and elongation of the alloy without V are lower than that of the alloy with 0.7%V under the same pressure. When the pressure is 400 MPa, the UTS, YS, and elongation of T6 heat-treated HPRSC alloy with 0.7%V are 301 MPa, 182 MPa, and 3.3%, respectively. With the decrease in the length of β-Al5FeSi phase, the quality index of the HPRSC alloy is increased.

Inoculation and Fading of Sr-Modified A356.2 Aluminum Alloy in Squeeze Casting

2016 ◽  
Vol 850 ◽  
pp. 671-678
Author(s):  
Jian Wei Niu ◽  
Lie Jun Li ◽  
Hai Jun Liu ◽  
Ji Xiang Gao ◽  
Chuan Dong Ren
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Aluminum Alloy ◽  
Hydrogen Absorption ◽  
Deleterious Effect ◽  
Squeeze Casting ◽  
Eutectic Silicon ◽  
Direct Reading ◽  
Air Bag ◽  
Fading Rate

The inoculation and fading behavior of Sr-modified aluminum alloy A356. 2 were studied for air bag bracket produced by squeeze casting. The effects of Sr, P, B contents and casting temperature on the microstructure and eutectic silicon morphology in different periods of inoculation were investigated by SEM and direct-reading Spectrometer. The influence of inoculation fading rate and addition of Sr on the casting mechanical properties and hydrogen absorption was studied. The experimental results showed that the inoculation process was completed in 1 h, and the eutectic silicon morphology can be maintained in almost subsequent 40 h after the addition of Sr. The fading rate decreased appreciably with the increase of casing temperature, P and B contents. The deleterious effect of the inoculation fading of Sr on the casting mechanical property can be compensated by the squeeze casting.

Mechanical Behaviour of Al7075 Hybrid Composites Developed through Squeeze Casting

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
V. Gopal ◽  
D. Marx Raghu Raja ◽  
Jaikumar Mayakrishnan ◽  
V. Hariram
Keyword(s):  
Mechanical Properties ◽  
Squeeze Casting ◽  
Hybrid Composites ◽  
Casting Process ◽  
Processing Technique ◽  
Squeeze Pressure ◽  
Valve Body ◽  
Automotive Engine ◽  
Al 7075 ◽  
Brake Rotors

The automotive and aerospace sector are behind the development of squeeze casting process, as the squeeze cast components exhibit improved mechanical properties. Squeeze casting is a hybrid metal processing technique that combines the advantage of both casting and forging in one operation. The aluminium alloy 7075 is a futuristic material that is widely used to produce automotive and aerospace components. Cylindrical component of AL 7075 was produced by varying the squeeze pressure at certain level. The specimen was made from the component as per ASTM standard and they were tested for mechanical properties such as tensile hardness and impact strength respectively. It was found that mechanical properties were enhanced with increase in squeeze pressure. The aluminium 7075 hybrid composites developed through squeeze casting is fabricated and experimented upon and found to have adequate potential for wide variety of application. In aerospace industries it can be used in gear components, blade sleeves, guide vanes, wing components etc. Applications in surface transport are brake rotors, automotive engine cylinder, engine exhaust valve, body chassis and connecting rods. This material can be used in light weight applications such as power lines and wind mill fans.

Mechanical Properties Simulation of Squeeze Cast Magnesium Alloy

2011 ◽  
Vol 306-307 ◽  
pp. 1464-1467
Author(s):  
Zhi Hong Guo ◽  
Hua Hou ◽  
Shu Wei Qu
Keyword(s):  
Mechanical Properties ◽  
Squeeze Casting ◽  
Tensile Elongation ◽  
Mold Temperature ◽  
Processing Parameters ◽  
Mould Temperature ◽  
Pouring Temperature ◽  
Squeeze Pressure ◽  
Squeeze Cast ◽  
Cast Magnesium

A research program was simulated to study the effects of pouring temperature, squeeze pressure and die temperature on the tensile, elongation and hardness properties of AZ91D magnesium alloys using anycasting software. The curves with different processing parameters on mechanical properties have been painted. The results indicated that mechanical properties increased firstly, then decreased when the pouring temperature increased to 670°C, and gradually increased with the increasing of squeeze pressure. The affect laws of mould temperature are similar as ones of pouring temperature. Eventually found that the squeeze casting got better mechanical properties(σb= 225MPa, δ= 3.6%, Vickers hardness=62) on the pouring temperature 670°C, mold temperature 180°C, holding pressure 120Mpa, pressure duration 25s.

Investigation of mechanical properties on Al 6061-B4C composite by squeeze casting process technique

2019 ◽  
Vol 1 (1) ◽  
pp. 38-48
Author(s):  
A. Sathishkumar ◽  
Gowtham A ◽  
M. Jeyasuriya ◽  
S. DineshBabu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Metal Matrix ◽  
Squeeze Casting ◽  
Casting Process ◽  
Weight Fraction ◽  
Squeeze Pressure ◽  
B4c Particles ◽  
Engineering Industries ◽  
Squeeze Casting Process

Aluminum alloy is widely used in automotive, aerospace and other engineering industries because of its excellent mechanical properties. The main objective is to enhance 6061 Al alloy’s mechanical properties by producing 6061-B4C composite through squeeze casting process. Experimentation was carried out with different micron sizes and weight fraction of B4C particles. The mechanical properties of reinforced metal matrix were experimentally investigated in terms of Ultimate Tensile Strength and Hardness. We observe that these two properties are improved by the reinforcement of B4C particles and applied squeeze pressure.

Variation of Mechanical Properties of AlSi20Cu2Ni1 Alloy with Co Addition and Ultrasonic Treatment

2014 ◽  
Vol 922 ◽  
pp. 638-644
Author(s):  
Meng Sha ◽  
Shu Sen Wu ◽  
Ping An ◽  
You Wu Mao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Liquidus Temperature ◽  
Volume Fraction ◽  
Fish Bone ◽  
Solute Diffusion ◽  
Chinese Script ◽  
Combined Effects ◽  
Preferential Growth ◽  
Co Addition

The combined effects of the Co addition and Ultrasonic Vibration (USV) on microstructure and properties of Al–20Si–2Cu–1Ni–0.6Mg alloy were studied in this paper. The volume fraction of Co-bearing intermetallic compounds was increased with the increasing of Co content when various levels of Co (from 0% to 1.5%) added respectively into the alloys whether they formed in traditional casting or with USV treatment. The Co-bearing compounds presented as Chinese script or granular when Co was equal or less than 0.7% and turned into dendritic or fish-bone shape when Co was more than 0.7%. USV treatment applied around liquidus temperature of the melt could lead to a refinement of Co-containing compounds by promoting nucleus formation, hindering preferential growth on certain direction, and enlarging solute diffusion coefficient. The addition of equal or less than 0.7% Co, as well as application of USV is very effective in promotion of tensile strength of the hypereutectic Al–Si alloys.

Ultrasonic Rheocasting for Refinement of Mg Alloys Reinforced with LPSO Phase

2018 ◽  
Vol 941 ◽  
pp. 1607-1612 ◽  
Author(s):  
Shu Lin Lü ◽  
Xiong Yang ◽  
Liang Yan Hao ◽  
Shu Sen Wu
Keyword(s):  
Mechanical Properties ◽  
Squeeze Casting ◽  
Mg Alloys ◽  
Average Thickness ◽  
Squeeze Pressure ◽  
Lpso Phase ◽  
Long Period ◽  
Lpso Structure ◽  
Cast Alloys ◽  
Gravity Cast

In this work, ultrasonic rheocasting was used to refine the microstructures of Mg alloys reinforced with long period stacking ordered (LPSO) phase. The semisolid slurries of Mg-Zn-Y and Mg-Ni-Y alloys were prepared by ultrasonic vibration (UV) and then formed by rheo-squeeze casting under high squeeze pressure (~ 400 MPa). The effects of UV and squeeze pressure on microstructure and mechanical properties of the Mg alloys were studied. The results reveal that UV and rheo-squeeze casting can significantly refine the LPSO structure and alpha-Mg matrix in Mg alloys, but they cannot change the phase compositions of the alloys or the type of LPSO phase. When the squeeze pressure is 400 MPa, the average thickness of LPSO phase is decreased, and the block LPSO structure is completed eliminated and uniformly distributed at the grain boundaries. Compared with the gravity cast alloys without UV, mechanical properties of the rheocast Mg alloys were enhanced and reached the maximums when the squeeze pressure was 400 MPa.

Microstructure and Properties of LPSO Phase Reinforced Mg Alloy Produced by Rheocasting

2016 ◽  
Vol 256 ◽  
pp. 186-191 ◽  
Author(s):  
Shu Lin Lü ◽  
Xiong Yang ◽  
Shu Sen Wu ◽  
Xiao Gang Fang ◽  
Jing Wang
Keyword(s):  
Mechanical Properties ◽  
Squeeze Casting ◽  
Mg Alloy ◽  
Semisolid Slurry ◽  
Strengthening Effect ◽  
Casting Alloy ◽  
Squeeze Pressure ◽  
Lpso Phase ◽  
Long Period ◽  
Refinement Mechanism

The long period stacking ordered (LPSO) phase reinforced Mg alloys have received many researches in recent years because of their excellent mechanical properties. However, the LPSO phase usually concentrates at the grain boundaries with a coarse network structure, which seriously deteriorates its strengthening effect. In this research, rheocasting and ultrasonic vibration (USV) process were firstly used to refine the LPSO phase in Mg alloy. The semisolid slurry of Mg96.9Y2Zn1Zr0.1 (at.%) alloy was prepared by USV and then formed by rheo-squeeze casting (RSC). The effects of USV and squeeze pressure on the microstructure and mechanical properties of this Mg alloy were investigated. The results show that the primary α-Mg and coarse LPSO phases were refined obviously by USV and RSC. The tensile strength and elongation of the RSC Mg96.9Y2Zn1Zr0.1 alloy were 232 MPa and 17.7% respectively, which were increased by 17.8% and 172.3% respectively compared to the conventional liquid casting alloy. The refinement mechanism of the LPSO phase in semisolid Mg alloy is also discussed.

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