Investigation on the Property of High Si-Al Alloy Prepared with Ultrasonic Vibration Aided Casting Technology

2015 ◽  
Vol 1095 ◽  
pp. 150-154
Author(s):  
Jian Zhang ◽  
Yang Li ◽  
Long Zhi Zhao ◽  
Ming Juan Zhao ◽  
Xian Jiang
Keyword(s):  
Ultrasonic Vibration ◽  
Silicon Content ◽  
Primary Silicon ◽  
Wear Volume ◽  
Wear Loss ◽  
Al Alloy ◽  
Alloy Structure ◽  
Casting Technology

In common hypereutectic high Si-Al alloy, the properties and applications of high Si-Al alloy was influenced by the thick multi-triangle shaped primary silicon seriously. In this paper, the fine hypereutectic Al-Si alloy was fabricated with ultrasonic vibration aided casting technology and the influence of ultrasonic vibration on the alloy structure is investigated as well as the influence of the silicon content on the wear volume and hardness with the comparison of microscopic structures. The results show that the increase of silicon content ascends the hardness of the high Si-Al alloy. However, along with increase of silicon content, the wear loss decreases initially and increases when the silicon content is larger than 22%.

Effects of ultrasonic vibration in the CMT process on welded joints of Al alloy

2018 ◽  
Vol 259 ◽  
pp. 282-291 ◽  
Author(s):  
Yinbao Tian ◽  
Junqi Shen ◽  
Shengsun Hu ◽  
Zhijiang Wang ◽  
Jian Gou
Keyword(s):  
Ultrasonic Vibration ◽  
Welded Joints ◽  
Al Alloy

Effect of Electromagnetic Stirring on the Reciprocating Wear Characteristics of A390 Alloy

2015 ◽  
Vol 830-831 ◽  
pp. 391-394
Author(s):  
G.L. Aswinikumar ◽  
V.R. Rajeev ◽  
K. Jayaraj ◽  
A. Ashok Kumar ◽  
Bibin Emmanuvel ◽  
...  
Keyword(s):  
Eutectic Silicon ◽  
Primary Silicon ◽  
Electromagnetic Stirring ◽  
Dry Sliding Wear ◽  
Wear Loss ◽  
Wear Characteristics ◽  
Contact Loads ◽  
Reciprocating Wear ◽  
A390 Alloy ◽  
Sliding Distance

Present study reports the effect of electromagnetic stirring (EMS) on reciprocating wear characteristics of A390 alloy. The microstructure features showed the refinement of eutectic silicon and reduction in size of primary silicon particles due to the effect of EMS. Hardness of the A390 alloy (100.28 BHN) prepared by EMS was higher than conventional A390 alloy (66.86 BHN). Reciprocating wear tests were carried out at different contact loads (15N to 90N) and speeds (0.2m/s to 1m/s) using pin-on-reciprocating plate tribometer for a constant sliding distance of 500m. As the reciprocating velocity increases from 0.2m/s to 1m/s, the wear loss of both EMS stirred and without stirred A390 alloys were found to decrease gradually up to the critical velocity 0.6m/s. It was noticed that above critical reciprocating velocity 0.6m/s, the wear loss was found to increase abruptly. Also, as the load increases from 15N to 90N, the wear loss of both the alloys were found to increase gradually up to 45N and thereafter abrupt increase in wear loss was noticed up to 90N. This clearly indicates a transition in the mode of wear from mild oxidative to severe metallic wear regime. Wear rate of without stirred A390 alloy in the region 45N to 90N showed predominant increase compared to EMS stirred A390 alloy. This trend suggests that EMS stirred A390 alloy is more coherent and stable under dry sliding wear conditions than without stirred A390 alloy.

Interface structure of ultrasonic vibration aided interaction between Zn–Al alloy and Al2O3p/6061Al composite

2005 ◽  
Vol 65 (13) ◽  
pp. 1959-1963 ◽  
Author(s):  
Zhiwu Xu ◽  
Jiuchun Yan ◽  
Gaohui Wu ◽  
Xiangli Kong ◽  
Shiqin Yang
Keyword(s):  
Ultrasonic Vibration ◽  
Interface Structure ◽  
Al Alloy

The Influence of Molding Parameters on the Structure of the ZnAl40Cu2Ti Alloy

2016 ◽  
Vol 246 ◽  
pp. 235-239 ◽  
Author(s):  
Tomasz Mikuszewski ◽  
Rafał Michalik
Keyword(s):  
Chemical Composition ◽  
Optical Microscopy ◽  
Brinell Hardness ◽  
Alloy Structure ◽  
X Ray ◽  
Casting Technology ◽  
Cu Alloy ◽  
Hardness Tests ◽  
Electronic Microscope

The aim of this study was to determine the influence of casting technology on the structure of the ZnAl40Cu2Ti alloy. The scope of the examination included Brinell hardness tests and tests on optical microscopy, scanning electronic microscope test and X-ray microanalysis. The tests showed that, depending on the casting technology can be obtained different ZnAl40Cu2Ti alloy structure, characterized by different chemical composition in microareas. It has been pointed out that in order to get ZnAl40Cu2Ti alloy modification of Zn-Al-Cu alloy used technology casting is necessary.

scholarly journals Change of Aluminum Alloys Structure by Sono-Solidification

2013 ◽  
Vol 13 (4) ◽  
pp. 39-42 ◽  
Author(s):  
S. Gnapowski ◽  
Y. Tsunekawa ◽  
M. Okumiya ◽  
K. Lenik
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Grain Refinement ◽  
Molten Metal ◽  
Ultrasonic Vibration ◽  
Silicon Content ◽  
Ultrasound Treatment ◽  
Ultra Sound ◽  
Eutectic Solidification

Abstract This experiment utilized five Aluminum alloys with silicon content percentages of 7, 10, 12.6, 14.5 and 17(wt)%. Ultrasonic vibration was applied to improve the quality of aluminum alloys. Sono-solidification, in which ultrasound vibrations are applied to molten metal during its solidification, is expected to cause improved mechanical properties due to grain refinement. Observed by microstructure photographs was that grains became smaller and their shapes more regular. Using ultra sound solidification α Al appeared during ultrasound treatment the eutectic solidification time was longest around 10% compared with same condition experiment without ultrasound treatment.

Preparation and rheocasting of semisolid slurry of 5083 Al alloy with indirect ultrasonic vibration process

2011 ◽  
Vol 528 (29-30) ◽  
pp. 8635-8640 ◽  
Author(s):  
Shulin Lü ◽  
Shusen Wu ◽  
Chong Lin ◽  
Zuqi Hu ◽  
Ping An
Keyword(s):  
Ultrasonic Vibration ◽  
Semisolid Slurry ◽  
Al Alloy ◽  
Vibration Process ◽  
5083 Al Alloy

Processing of Primary Silicon and Mg2Si Reinforced Hybrid Functionally Graded Aluminum Composites by Centrifugal Casting

2012 ◽  
Vol 710 ◽  
pp. 395-400 ◽  
Author(s):  
S. Raghunandan ◽  
Jasim Akber Hyder ◽  
T.P.D. Rajan ◽  
K. Narayan Prabhu ◽  
B.C. Pai
Keyword(s):  
Centrifugal Casting ◽  
Casting Process ◽  
Primary Silicon ◽  
Shrinkage Porosity ◽  
Functionally Graded ◽  
Al Alloy ◽  
Primary Si ◽  
The Difference ◽  
Silicon Particles

In the present investigation, FGMs of mono-dispersed in-situ primary Si and their hybrids with Mg2Si reinforcements have been fabricated by the centrifugal casting process using 390 commercial Al alloy. Hard primary silicon particles are formed during the solidification of the 390 alloy and Mg2Si reinforcements are formed by the addition of varying amount of magnesium into the A390 aluminium alloy. Owing to the difference in density both primary silicon and Mg2Si gets segregated towards the inner periphery during centrifugal casting. The size of the Mg2Siin-situreinforcement phase is relatively smaller and is distributed in the edges of primary silicon particles and also individually in the matrix. Thein-situMg2Si and primary silicon can significantly increase the hardness and strength of the inner periphery of the casting. Higher Mg contents have been observed to introduce significant porosity leading to poor castings. Addition of phosphorous to the melt has led to the modification and refinement of primary Si morphology and also helped in the reduction of shrinkage porosity. Maximum hardness of 167 BHN is observed towards the inner periphery of the 390Al-2.5%Mg added in-situ composite.

Effect of Ultrasonic Vibration on the Friction and Wear Properties of GCr15/45# Steel Frictional Pairs Lubricated by n-Al2O3 Additives

2012 ◽  
Vol 538-541 ◽  
pp. 1920-1923
Author(s):  
Yu Lin Qiao ◽  
Shan Lin Yang ◽  
Yan Zang ◽  
Xin Yu Dong ◽  
Qing Sheng Cui
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Wear Scar ◽  
Friction Reduction ◽  
Wear Volume ◽  
Wear Properties ◽  
Friction And Wear Properties

The friction and wear properties of GCr15/45# steel frictional pairs lubricated by n- Al2O3 additives under ultrasonic vibration or not were studied. The scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS) and energy dispersive spectrometer (EDS) were carried out to analyse the wear scar surface. The effect mechanism of ultrasonic vibration on friction pairs was discussed. The results indicated that ultrasonic vibration could decrease the friction and wear of GCr15/45# friction pairs, when the content of n-Al2O3 was 0.5wt%, the effect of ultrasonic vibration on friction pairs was most obvious. The friction coefficient, wear volume and wear scar depth under ultrasonic vibration decreased 10%, 34% and 13%, respectively. The friction reduction and anti-wear mechanism of n-Al2O3 was single “micro ball bearing” without ultrasonic vibration, and it changed to “micro ball bearing” and adsorption penetration film with ultrasonic vibration, so the friction coefficient and wear volume was reduced.

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