scholarly journals Effect of Alloying Elements on the Sr Modification of Al-Si Cast Alloys

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 342
Author(s):  
Elisa Fracchia ◽  
Federico Simone Gobber ◽  
Mario Rosso
Keyword(s):  
Eutectic Silicon ◽  
Alloying Elements ◽  
Spherical Form ◽  
Beneficial Effects ◽  
Sr Modification ◽  
Casting Alloys ◽  
Cast Alloys ◽  
Modifying Effect ◽  
Dendritic Arm Spacing ◽  
Si Content

Strontium-based modifier alloys are commonly adopted to modify the eutectic silicon in aluminum-silicon casting alloys by changing the silicon shape from an acicular to a spherical form. Usually, the modifier alloy necessary to properly change the silicon shape depends on the silicon content, but the alloying elements’ content may have an influence. The AlSr10 master alloy’s modifying effect was studied on four Al-Si alloys through the characterization of microstructural and mechanical properties (micro-hardness and impact tests). The experimental results obtained on gravity cast samples highlighted the interdependence in the modification of silicon between the Si content and the alloying elements. After modification, a higher microstructural homogeneity characterized by a reduction of up to 22.8% in the size of intermetallics was observed, with a generalized reduction in secondary dendritic arm spacing. The presence of iron-based polygonal-shaped intermetallics negatively affects Sr modification; coarser silicon particles tend to grow close to α-Fe. The presence of casting defects such as bifilm reduces Sr modification’s beneficial effects, and little increase in absorbed impact energy is observed in this work.

Effect of Extended Thermal Exposure and Alloying Elements on the Morphology of Eutectic Si in Al–Si Cast Alloys

2020 ◽  
Vol 14 (4) ◽  
pp. 1013-1024 ◽  
Author(s):  
M. H. Abdelaziz ◽  
A. M. Samuel ◽  
H. W. Doty ◽  
F. H. Samuel
Keyword(s):  
Thermal Exposure ◽  
Alloying Elements ◽  
Eutectic Si ◽  
Cast Alloys

Aluminum Casting Alloys

2004 ◽  
pp. 7-20
Keyword(s):  
Work Hardening ◽  
Performance Characteristics ◽  
Alloying Elements ◽  
Casting Alloy ◽  
Cast Aluminum ◽  
Aluminum Casting ◽  
Aluminum Casting Alloy ◽  
Casting Alloys ◽  
Copper Aluminum ◽  
Aluminum Silicon

Abstract Aluminum casting alloy compositions parallel those of wrought alloys in many respects. However, because work hardening plays no significant role in the development of casting properties, the use and purposes of some alloying elements differ in casting alloys versus wrought alloys. This chapter provides information on specifications and widely used designation systems and alloy nomenclature for aluminum casting alloys. It describes the composition of seven basic families of aluminum casting alloys: aluminum-copper, aluminum-silicon-copper, aluminum-silicon, aluminum-silicon-magnesium, aluminum-magnesium, aluminum-zinc-magnesium, and aluminum-tin. The chapter discusses the effects of alloying elements on the properties of cast aluminum. It provides information on various alloys that are grouped with respect to their applications or major performance characteristics.

Effects of Modification and Heat Treatment on Microstructure and Mechanical Property of Two-Step Foamed ZL111 Alloy Foam

2018 ◽  
Vol 933 ◽  
pp. 68-77
Author(s):  
Yu Yuan Jiang ◽  
Xiao Xu Luo ◽  
Qing Chen ◽  
Ming Wei Zhao ◽  
Jian Sheng Lu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Eutectic Silicon ◽  
Absorption Capacity ◽  
Compressive Property ◽  
Average Pore ◽  
T6 Heat Treatment ◽  
Sr Modification ◽  
Average Size ◽  
Microstructure And Mechanical Property

ZL111 alloy foams with a porosity of 80% and an average pore diameter of 3.5 mm were fabricated using a two-step foaming process, and the effects of modification and heat treatment on their microstructure and mechanical property were studied. The results indicates that by Y&Sr modification, most of the eutectic silicon in the ZL111 alloy foam is transformed from plate-like into dot-like forms, and the average size of evenly distributed α-Al grain is reduced from 80~100μm to 30~40μm, which is more efficient than separate Y or Sr modifications. By combining Y and Sr modification and T6 heat treatment, the α-Al grain size of ZL111 alloy foam maintains its previous modified effect, eutectic silicon remains spherical and well-distributed, and CuAl2and Al9FeMg3Si5are dispersed homogeneously at the α-Al grain boundary. The Y&Sr modification and T6 heat treatment also significantly improved the compressive property of ZL111 alloy foam, when we compared them with the untreated ZL111 alloy foam. The compressive strength rises from 13.3 MPa to 22.6 MPa, the densification strain improves from 59.3% to 76.9%, and the energy absorption capacity increases from 4.87 MJ/m3to 13.77 MJ/m3.

scholarly journals Alloy Designation, Processing, and Use of AA6XXX Series Aluminium Alloys

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Prantik Mukhopadhyay
Keyword(s):  
Weight Ratio ◽  
Direct Chill ◽  
Alloying Elements ◽  
Age Hardening ◽  
Working Process ◽  
Industrial Processing ◽  
Military Vehicles ◽  
Structural Applications ◽  
Cast Alloys ◽  
Potential Use

The strength-to-weight ratio offered by AA6XXX alloys and their enhanced mechanical properties have become crucial criteria for their use in light weight military vehicles, rockets, missiles, aircrafts, and cars, used for both defence and civil purpose. The focus of this review paper is to put together the latest knowledge available from various sources on alloy design, industrial processing, development of properties, and potential use of AA6XXX alloys. The direct chill (DC) cast AA6XXX wrought alloys which are subsequently processed by fabrication process like hot working, cold working, process annealing, and age hardening heat treatments are the foci of this review though designation section also contains the designations of cast alloys to provide the reader a broad overview on designation. World-wide accepted designations are briefly tabled along with their alloying elements. The effects of the alloying elements which are generally used for AA6XXX wrought alloys are discussed incorporating their interactions during wrought AA6XXX alloy fabrication. The significance of the alloying and also the processing to develop the certain properties and the underlying strengthening mechanisms are discussed. The frequent and versatile uses of these AA6XXX alloys for the structural applications both in defence and civil purpose are put forth.

The Influence of the Al-Ti-B/Al-Sr Modification on the Microstructure and Properties of the Hypereutectic Al-Si Alloy in Automotive Piston

2013 ◽  
Vol 744 ◽  
pp. 339-344 ◽  
Author(s):  
Meng Xiang Liu ◽  
Jian Mei Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Friction And Wear ◽  
Eutectic Silicon ◽  
Primary Silicon ◽  
Optical Microscope ◽  
Sr Modification ◽  
Alloy Microstructure ◽  
Compound Modification ◽  
Better Than

By using some types of means such as Optical Microscope (OM), Scanning Electron Microscopy(SEM), the testing of tensile mechanical properties and the testing of friction and wear, the impacts of the Al-5Ti-1B and Al-20Sr modification on the Al-16Si-4Cu-0.5Mg-0.2Mn alloy microstructure, mechanical properties and friction properties are researched. The results turn out that the modification can significantly refine the primary silicon and the eutectic silicon in the alloy, the Al-5Ti-1B mainly refined the primary silicon in the alloy, the Al-20Sr refined the eutectic silicon; the alloy’s effect of refinement after compound modification is better than that in separate metamorphism. Modification can improve the tensile strength and elongation of the alloy: the tensile strength of the alloy has been increased by 65MPa after its compound modification; also the elongation by 0.4%. Modification can improve wear-resisting property of the alloy and also its effect of compound modification is better than that of separate metamorphism. The modification mechanism of Al-5Ti-1B is that Al3Ti and TiB2 belongs to heterogeneous nucleation; while the modification mechanism of Al-20Sr is that the strontium changes the growth pattern of Si phase.

A Feasibility Report on the Comparsion of the Characteristics of Manufacturing a Bearing Cover by the Processes of Sand Casting and Shell Moulding

2018 ◽  
Vol 1148 ◽  
pp. 204-210
Author(s):  
M.Madhu Vamsi ◽  
V. Pradeep Kumar ◽  
S.H. Shariff
Keyword(s):  
Automotive Industry ◽  
Driving Force ◽  
Fuel Efficiency ◽  
Cast Aluminum ◽  
The Past ◽  
Casting Alloys ◽  
Aluminum Castings ◽  
Cast Alloys ◽  
Improved Performance ◽  
Cast Microstructure

The use of aluminum castings in the automotive industry has increased dramatically over the past two decades. The Al-Si system forms the basis of many important casting alloys, LM 0, LM 2, LM 4, LM 5, LM 6, LM 12, LM 13, LM 24 and LM 26 are the major cast alloys used in aerospace casting (e.g., fuel pump connectors) and premium automotive castings (e.g., suspension arms). The driving force for this increased use is vehicle weight reduction for improved performance, particularly fuel efficiency. In many cases the mechanical properties of the cast aluminum parts are superior to those of the cast iron or wrought steel parts being replaced; however, in some applications, defects in the cast microstructure undermine performance characteristics.

The Effect of Alloying Elements on Thermal Conductivity of Aluminum Alloys in High Pressure Die Casting

2013 ◽  
Vol 813 ◽  
pp. 175-178 ◽  
Author(s):  
Cheol Woo Kim ◽  
Jae Ik Cho ◽  
Se Weon Choi ◽  
Young Chan Kim
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Alloys ◽  
Die Casting ◽  
Pure Aluminum ◽  
High Thermal Conductivity ◽  
Alloying Elements ◽  
Alloying Element ◽  
Casting Alloys ◽  
Pressure Die Casting ◽  
Effect Of Alloying

Recently, demand of aluminum alloys for manufacturing in components with high thermal conductivity application increases. However, the most aluminum die casting alloys exhibit very lower thermal properties, about only a half of pure aluminum. In die casting alloys, alloying elements are essential to obtain sufficient fluidity and mechanical strength, therefore, in this study, the effect of alloying elements, Si, Cu, Mg, Fe and Mn, on thermal conductivity, die casting characteristics and mechanical properties were analyzed and the appropriate amount of each alloying element were investigated. The results showed that Mn had the most deleterious effect in thermal conductivity and Si and Fe contents were important to improve fluidity and strength. The alloy with 1.5~2.0wt.%Si and 0.6wt.%Fe showed very good combination of high thermal conductivity and sufficient casting characteristics.

Effect of Strontium on Structure and Property of ZL102

2013 ◽  
Vol 442 ◽  
pp. 40-43
Author(s):  
Jie Wang ◽  
Guo Sheng Cai ◽  
Hai Feng Lu ◽  
Yue Hong Jiang ◽  
Rong Fa Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Eutectic Silicon ◽  
Structure And Property ◽  
Sr Modification ◽  
Analysis Tools ◽  
Microstructure And Mechanical Properties ◽  
Fine Fiber

Analysis tools of microstructure and mechanical properties were used to study ZL102 that was modified by Sr and without modification. The experiment shows that the morphology of eutectic silicon and α-Al phase of the modified alloy have greater changes than that without modification. With the added amount of Sr increases, the morphology of the eutectic silicon changes from sheet into flakiness and fibrous, and finally the fine fiber; α-Al phase increased and showed a small short rod distribution. The optimized technology of Sr modification agent is 0.05%Sr addition, the tensile strength of modified alloy is 218.5 MPa, and the elongation is 2.8%.

Effect of Different Cooling Rate on the Freezing Behavior of TiB2/A356 Composite

2014 ◽  
Vol 1053 ◽  
pp. 157-164
Author(s):  
Xiu Chuan Wu ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Kang Le Tian
Keyword(s):  
Composite Materials ◽  
Cooling Rate ◽  
Eutectic Silicon ◽  
Tensile Fracture ◽  
Size Refinement ◽  
Reinforced Composite ◽  
Average Grain Size ◽  
Eutectic Si ◽  
Si Content ◽  
Particle Reinforced Composite

The microstructure and tensile properties of TiB2particles reinforced A356 composite materials at different cooling rates are investigated. Experimental results show that the composition of the alloy solidification ,eutectic silicon content , morphology and size have undergone significant changes while the cooling rate increased: On one hand, α-phase grains significantly reduced, by a 50 μm average grain size refinement to 1~5μm with the evolution from coarse dendritic to rosette dendritic, or even spherical evolution; On the other hand, eutectic Si content increases, and diameter, aspect ratio also showed a decreasing trend, while the circularity is gradually increasing. Meanwhile, with the increasing of cooling rate, the particle distribution of TiB2/A356 particle reinforced composite materials can be optimized. Particle aggregation is reduced, as a result TiB2particles’ reinforcement is more obvious, and the tensile fracture shows the obvious characteristics of ductile fracture.

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