Microstructure and Interfacial Characterization Near Grain Boundary of Al2O3/SiC Reinforced AA 6061 Semi-solid Squeeze Cast Composite

2021 ◽  
pp. 319-330
Author(s):  
Nitin Srivastava ◽  
Mohd Anas
Keyword(s):  
Grain Boundary ◽  
Cast Composite ◽  
Squeeze Cast ◽  
Semi Solid

Age hardening behaviour of semi‐solid squeeze cast A319 aluminium alloy

2018 ◽  
Vol 49 (12) ◽  
pp. 1503-1509 ◽  
Author(s):  
Q.F. Wang ◽  
L.D. Wang ◽  
D.Y. Zhu ◽  
Z. Lin ◽  
X. Chen ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Age Hardening ◽  
Squeeze Cast ◽  
Semi Solid

Effect of Annealing on Microstructure and Properties for Semi-Solid Magnesium Strips

2011 ◽  
Vol 704-705 ◽  
pp. 581-585
Author(s):  
Ying Zhang ◽  
Jin Hua Xu ◽  
Shui Sheng Xie ◽  
Mao Peng Geng ◽  
Hong Min Guo ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Annealing Temperature ◽  
Eutectic Structure ◽  
Annealing Process ◽  
Solidification Structure ◽  
Dispersion Strengthening ◽  
Roll Casting ◽  
Mg17al12 Phase ◽  
Equilibrium Solidification ◽  
Semi Solid

The experiment of the roll-casting for semi-solid AZ91D magnesium was carried out on the equipment made by ourselves in our laboratory. Parameters of annealing process and the effect of annealing temperature on structure and hardness of semi-solid magnesium were investigated. It was shown that annealing process can improve the structure and properties of roll-casting strips for semi-solid magnesium. In addition, it can relieve the eutectic structure segregation and make β-Mg17Al12 phase precipitate from primary α-Mg grain, which can cause dispersion strengthening process when the annealing temperature is about 420°C. With the increasing of annealing temperature, semi-solid primary α-Mg grain boundary become obscure gradually, grain growth is indistinct and β-Mg17Al12 phase is precipitated from the inner α-Mg grain. However, the aberrated eutectic α-Mg grain for non-equilibrium solidification increase continuously and separate gradually from β-Mg17Al12 phase, which makes the β-Mg17Al12 phase connect together and distribute on the α-Mg grain boundary closely approaching the equilibrium solidification structure. Hardness in eutectic structure area is higher than primary α-Mg grain. With the increasing of annealing temperature, hardness in eutectic structure area will increase and then decrease, when the temperature is over 400°C, the hardness will increase again, but hardness of primary α-Mg grain nearly unchanged. Keywords: casting-rolling; anneal; semi-solid; magnesium alloy; microstructure

Study on Creep Properties of SiCp/AZ61 Composites

2011 ◽  
Vol 189-193 ◽  
pp. 4227-4230
Author(s):  
Hong Yan ◽  
Zhi Min Huang
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Dynamic Mechanical Thermal Analysis ◽  
Creep Properties ◽  
Casting Technique ◽  
Sic Particles ◽  
The Matrix ◽  
Semi Solid

SiCp/AZ61 composites reinforced with SiC particles were fabricated by semi-solid stirring-melt casting technique. The creep properties of the composites have been studied by dynamic mechanical thermal analysis, micro-structural and XRD observation. The results show that the matrix grains were refined obviously at high temperature with SiC particles introducing and the creep properties of SiCp/AZ61 composites were improved comparing with AZ61 alloy. SiC particles were substituted for Mg17Al12 phase that was easily intenerated at high temperature on grain boundaries. The pinning of SiC particles prevents dislocation and slip of grain boundary at high temperature.

Creep of Slurry Squeeze-Cast ZA-27 Zinc Alloy with Different Solid Fractions at 140 °C

2018 ◽  
Vol 928 ◽  
pp. 194-199
Author(s):  
Chinnarut Panpun ◽  
Thawatchai Plookphol ◽  
Somjai Janudom
Keyword(s):  
Solid Fraction ◽  
Research Work ◽  
Creep Property ◽  
Ambient Air ◽  
Tensile Creep ◽  
Diffusional Creep ◽  
Zinc Alloy ◽  
Squeeze Cast ◽  
Creep Stress ◽  
Semi Solid

This research work was aimed at studying creep of a slurry squeeze-cast ZA-27 zinc alloy. The Gas-Induced Semi-Solid (GISS) technique was used for preparing semi-solid metal slurry with two different solid fractions. The ZA-27 alloy slurry was squeeze cast to form plate-like specimens with dimension of 100×100×15 mm3. The tensile specimens were machined from the squeeze-cast plates and heat-treated before mechanical test. Tensile creep tests were performed at 140 °C, at stresses of 20, 40, 60 and 80 MPa, in an ambient air. Two groups of specimens, the low solid fraction ZA-27 alloy (GISS 5s) and the high solid fraction ZA-27 alloy (GISS 15s) were tested for comparison of creep property. The results show that the GISS 5s has longer creep life than the GISS 15s. The power-law creep stress exponents (n) of GISS 5s and GISS 15s are 1.45 and 1.04, respectively. Based on the creep stress exponents found from the present study, it could be concluded that at the temperature of 140 °C and stress between 20 and 80 MPa, creep of both alloys was governed by the diffusional creep mechanism.

Squeeze Casting of Semi-Solid A356 Alloy

2014 ◽  
Vol 217-218 ◽  
pp. 436-441
Author(s):  
Xiang Jie Yang ◽  
Ming Wang ◽  
Liang Sheng Ding ◽  
Hong Min Guo ◽  
Xu Bo Liu
Keyword(s):  
Cross Section ◽  
Squeeze Casting ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Three Dimensional ◽  
A356 Alloy ◽  
Equivalent Diameter ◽  
Squeeze Cast ◽  
Cast Product ◽  
Semi Solid

the rheo-squeeze casting (Rheo-SQC) combining the rheocasting and the SQC was developed, in which semi-solid slurry was produced by the low superheat pouring with a shearing field (LSPSF) process. The three dimensional morphology of the primary α-Al phase and the rest spacing of slurry prepared by LSPSF process have been reconstructed and visualized, and the microstructures of squeeze cast A356 alloy have been obtained. Based on the three dimensional microstructure reconstructed, their three dimensional characterizations such as solid volume fraction, equivalent diameter of the extracted primary α-Al phase were measured and calculated, and the microstructures of cross section of squeeze cast product were investigated.

Effect of Squeeze Pressure on Microstructure, Aging and Mechanical Properties of A357/ ZrO2 Composite

2011 ◽  
Vol 4 ◽  
pp. 59-66 ◽  
Author(s):  
M.T. Abou El Khair
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Squeeze Casting ◽  
Stir Casting ◽  
Squeeze Pressure ◽  
Cast Composite ◽  
Squeeze Cast ◽  
Compression Properties

AlSiMg (A357) composites containing 10 vol. % zirconia (ZrO2) particulates have been synthesized by the stir process followed by squeeze casting. Pressures of 25 and 50 MPa were maintained during solidification in specially designed die and ram and maintained at 250°C. Results show that with increasing squeeze pressure, the density increases while porosity decreases. The hardness of squeeze cast composite is higher than that of stir casting by about 10%. The compression properties have been evaluated and compared. The results show that compressive strength increases with squeeze pressure.

Mechanical Analysis of Semi-Solid Metals Shear Deformation during Compression

2008 ◽  
Vol 141-143 ◽  
pp. 439-443 ◽  
Author(s):  
Shou Jing Luo ◽  
Qiang Chen ◽  
Xiao Rong Gao
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Solid State ◽  
Grain Boundary ◽  
Shear Deformation ◽  
Mechanical Analysis ◽  
Deformation Mechanisms ◽  
Isothermal Compression ◽  
Semi Solid ◽  
Theoretical Analyses

Rheological behavior of semi-solid metals during isothermal compression is the most basic forming way for semi-solid die forging. In this paper, based on the metal plastic deformation and high pressure solidification theory, the shear deformation mechanisms of semi-solid metals were analyzed during isothermal compression. Experimental observations and theoretical analyses for AZ91D and composite Al/Al2O3 in the semi-solid state were performed with thermal simulation tests. The results for theoretical analyses and experimental observations show that the shear deformation of semi-solid metals has been realized by metal inhomogeneous flowing from macroscopic view and by grain boundary inhomogeneous migrating from microscopic view respectively during compression.

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