Correlation between Alloying Elements and Aging Parameters and Hardness and Machinability of Aluminum-Silicon Alloys Using Minitab Software

2015 ◽  
Vol 1101 ◽  
pp. 217-224
Author(s):  
Mahmoud M. Tash ◽  
Khaled A. Abuhasel ◽  
Saleh A. Alkahtani
Keyword(s):  
Artificial Aging ◽  
Drilling Force ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Alloying Additions ◽  
Surface Fraction ◽  
Solution Treated ◽  
Heat Treated ◽  
Si Content ◽  
Mg Content

The present study was undertaken to investigate the effect of alloying additions and aging parameters (time and temperature) on the hardness and machinability of Al-Si alloys. Hardness, drilling force and moment and number of holes drilled/tool measurements were carried out on specimens prepared from grain refined, Sr modified and heat treated Al-Si alloys. Aging treatments were carried out for the as solution treated (SHT) specimens (after quenching in warm water). The specimens were aged at different conditions; artificial aging was carried out at 180˚C, 200 ˚C and 220˚C for 2 and 5 h. Hardness, drilling force and moment and number of holes drilled/tool as a function of different metallurgical parameters (i.e. %Si content, %Mg content, heat treatment parameters (time and temperature), Cu-intermetallics surface fraction and Fe-intermetallic surface fractions) are analyzed to acquire an understanding of the effects of these variables and their interactions on the hardness and machinability of heat treated Al-Si alloys.

Experimental Correlation between Metallurgical Parameters, Hardness and Drilling Force and Moment of Al-Si Alloys

2014 ◽  
Vol 1082 ◽  
pp. 79-84 ◽  
Author(s):  
Mahmoud M. Tash ◽  
Khaled A. Abuhasel ◽  
Saleh A. Alkahtani
Keyword(s):  
Warm Water ◽  
Drilling Force ◽  
Alloying Additions ◽  
Solution Treated ◽  
Heat Treated ◽  
Experimental Correlation ◽  
Effect Of Alloying

The present study was undertaken to investigate the effect of alloying additions and aging parameters (time and temperature) on the hardness and machinability of Al-Si alloys. Hardness, drilling force and moment and number of holes drilled/tool measurements were carried out on specimens prepared from grain refined, Sr modified and heat treated Al-Si alloys. Aging treatments were carried out for the as solution treated (SHT) specimens (after quenching in warm water) at different conditions. Hardness, drilling force and moment and number of holes drilled/tool as a function of different metallurgical parameters are analyzed to acquire an understanding of the effects of these variables and their interactions on the hardness and machinability of heat treated Al-Si alloys.

Influence of Nanodispersions on Properties and Microstructure Features of Cast and T6 Heat-Treated Al Si Hypoeutectic Alloys

2012 ◽  
Vol 192-193 ◽  
pp. 76-82
Author(s):  
Iman El Mahallawi ◽  
Hoda Abdelkader ◽  
Laila Shehata ◽  
Asmaa Amer ◽  
Joachim Mayer ◽  
...  
Keyword(s):  
Lamellar Spacing ◽  
Light Metal ◽  
Nano Particles ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Mechanical Stirring ◽  
Heat Treated ◽  
Cast Alloys ◽  
Semi Solid ◽  
Function Relationship

Cast light metal alloys have retained their importance and unique characteristics as first candidates when cost-function relationship is considered. Hypoeutectic aluminum silicon alloys as (A356) exhibit several specific and interesting properties that qualify them to be used in many automotive and aeronautical applications. Evidence of significant enhancement in strength in the properties of Al-Si cast alloys by incorporating nano-particles have been recently presented. The present study aims at developing nano-dispersed Al-Si alloys with suitable casting methods that assure the dispersion of the nano-particles. In this work a number of cast samples of A356 were prepared by rheo-casting in a specially designed and built furnace unit allowing for the addition of the nano-particles into the molten Al-Si alloy in the semi-solid state with mechanical stirring. The microstructural features and the mechanical properties of the cast and T6 heat treated samples were investigated. The results obtained in this work showed enhancement in the mechanical strength of the nano-dispersed alloys, accompanied by significant increase in the elongation percentage, supported by evidence of refined dendrite arms length, and inter-lamellar spacing.

The Influence of Silicon on Age Hardening Kinetics and Phase Precipitation in Al-Mg-Zn Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 579-584 ◽  
Author(s):  
Vidar Hansen ◽  
Aferdita Vevecka-Priftaj ◽  
J. Fjerdingen ◽  
Y. Langsrud ◽  
J. Gjønnes
Keyword(s):  
Solid Solution ◽  
Solution Treatment ◽  
Age Hardening ◽  
Solution Temperature ◽  
Silicon Alloys ◽  
Zone Formation ◽  
High Silicon ◽  
Si Content ◽  
Mg Content ◽  
Kinetics Of

Solid solution treatment at 450°C and 550°C and subsequent two step age hardening at 100°C and 150 °C up to 144 hrs. have been carried out for two conventional and four experimental 7xxx type of alloys with different Mg, Zn, Fe and Si content. The influence of silicon on phase and kinetics of age hardening zones and particles has been followed. Increase in silicon required higher solid solution temperature in order to achieve reasonable age hardening response. High silicon alloys, solid solution treated at high temperature, have tendency to recrystallize during aging. The GP-zone formation is affected by the ratio between Mg, Zn and Si. In alloys with Mg/Zn ratio in the range 1:2 GP(I)-type zones are formed, at higher solid solution temperature also GP(II); low Mg-content favor GP(II)- zones. In high silicon alloys GP-zones of b’’’-type (from the Al-Mg-Si) system contribute to age hardening. The precipitation kinetics of the main hardening phase h’, is influenced by the preceding GP-zone stage.

scholarly journals Evaluation of Cracking Causes of AlSi5Cu3 Alloy Castings

2014 ◽  
Vol 59 (3) ◽  
pp. 1089-1092 ◽  
Author(s):  
Š. Eperješi ◽  
M. Matvija ◽  
ľ. Eperješi ◽  
M. Vojtko
Keyword(s):  
Automotive Industry ◽  
Pressure Casting ◽  
Operating Life ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Heat Treated ◽  
Low Pressure Casting ◽  
Alloy Castings ◽  
Pressure Die Casting

Abstract Recently, the castings made from aluminum-silicon alloys by pressure die casting are increasingly used in the automotive industry. In practice, on these castings are high demands, mainly demands on quality of their structure, operating life and safety ensuring of their utilization. The AlSi5Cu3 alloy castings are widely used for production of car components. After the prescribed tests, the cracks and low mechanical properties have been identified for several castings of this alloy, which were produced by low pressure casting into a metal mould and subsequent they were heat treated. Therefore, analyses of the castings were realized to determine the causes of these defects. Evaluation of structure of the AlSi5Cu3 alloy and causes of failure were the subjects of investigation presented in this article.

Crystallographic Differences of Metastable NI2MO in a NI-MO-AL Superalloy

1980 ◽  
Vol 38 ◽  
pp. 158-159
Author(s):  
Michael M. Kersker ◽  
E. A. Aigeltinger ◽  
J. J. IIren
Keyword(s):  
Mechanical Properties ◽  
Air Cooling ◽  
Solution Treated ◽  
Heat Treated ◽  
Metastable Compounds ◽  
Rapidly Solidified

Ni-rich alloys based on approximate ternary composition Ni-8Mo-15A1 (at%) are presently under investigation in an attempt to study the contribution, if any, of the profusion of Mo-rich NixMo metastable compounds that these alloys contain to their excellent mechanical properties. One of the alloys containing metastable NixMo precipitates is RSR 197 of composition Ni-8.96Mo-15.06A1-1.98Ta-.015Yt. The alloy was prepared at Pratt and Whitney Government Products Division, West Palm Beach, Florida, from rapidly solidified powder. The powder was canned under inert conditions and extruded as rod at 1315°C. The as-extruded rod, after air cooling, was solution treated at 1315°C for two hours, air cooled, and heat treated for one hour at 815°C, followed again by air cooling.

REYNOLDS 390 and A390

Alloy Digest ◽  
1971 ◽  
Vol 20 (8) ◽  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
High Hardness ◽  
Heat Treating ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Temperature Performance

Abstract REYNOLDS 390 and A390 are hypereutectic aluminum-silicon alloys having excellent wear resistance coupled with good mechanical properties, high hardness, and low coefficients of expansion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, and machining. Filing Code: Al-203. Producer or source: Reynolds Metals Company.

ALUMINUM 713.0

Alloy Digest ◽  
1985 ◽  
Vol 34 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Room Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Good Combination ◽  
Casting Alloy ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Permanent Mold Castings ◽  
Aluminum Base

Abstract ALUMINUM 713.0 is an aluminum-base casting alloy that ages at room temperature to provide high-strength sand and permanent-mold castings. It has a good combination of mechanical properties and its corrosion resistance is equivalent to that of the aluminum-silicon alloys. It is dimensionally stable. Among its many uses are housings, machinery parts, fittings, lever arms and brackets. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-263. Producer or source: Various aluminum companies.

Effects of T6 Age Hardening on Microstructure and Mechanical Properties of Al-Si-Cu Cast Aluminium Alloy

2013 ◽  
Vol 770 ◽  
pp. 88-91
Author(s):  
Amporn Wiengmoon ◽  
Pattama Apichai ◽  
John T.H. Pearce ◽  
Torranin Chairuangsri
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Aging Time ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Hot Water ◽  
Age Hardening ◽  
Solution Treated ◽  
Cast Condition

Effects of T6 artificial aging heat treatment on microstructure, microhardness and ultimate tensile strength of Al-4.93 wt% Si-3.47 wt% Cu alloy were investigated. The T6 age hardening treatment consists of solution treatment at 500±5°C for 8 hours followed by quenching into hot water at 80°C and artificial aging at 150, 170, 200 and 230°C for 1-48 hours followed by quenching into hot water. Microstructure was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). XRD and SEM revealed that the microstructure in the as-cast condition consists of primary dendritic α-Al, acicular-plate and globular forms of eutectic Si and intermetallic phases including globular Al2Cu and a flake-shape Al5FeSi. By T6 aging hardening, some intermetallics were dissolved and spheroidized. The volume fraction of eutectic phases in the as-cast, solution-treated, and solution-treated plus aging at 170°C for 24 hours is 17%, 12% and 10%, respectively. TEM results showed that precipitates in under-aging condition at 170° C for 6 hours are in the form of disc shape with the diameter in the range of 7-20 nm. At peak aging at 170°C for 24 hours, thin-plate precipitates with about 3-10 nm in thickness and 20-100 nm in length were found, lengthening to about 30-200 nm at longer aging time. The microhardness and ultimate tensile strength were increased from 71 HV0.05 and 227 MPa in the as-cast condition up to 140 HV0.05 and 400 MPa after solution treatment plus aging at 170°C for 24 hours, and decreased at prolong aging time.

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