scholarly journals The Effect of the β-Al5FeSi Phases on Microstructure, Mechanical and Fatigue Properties in A356.0 Cast Alloys with Higher Fe Content without Additional Alloying of Mn

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1943
Author(s):  
Lenka Kuchariková ◽  
Denisa Medvecká ◽  
Eva Tillová ◽  
Juraj Belan ◽  
Michaela Kritikos ◽  
...  
Keyword(s):  
Impurity Content ◽  
Industrial Applications ◽  
Fatigue Properties ◽  
Cast Aluminum ◽  
Cast Aluminum Alloys ◽  
Fe Content ◽  
Negative Effect ◽  
Cast Alloys ◽  
Almost All ◽  
Low Solubility

Secondary-cast aluminum alloys have increasing industrial applications. Their biggest deficiency is their impurity content, especially Fe, which has low solubility in Al and almost all the content creates intermetallic phases. This work examines the effect of higher Fe content on the microstructure and properties of A356.0 alloy. At the same time, no other possibility existed to affecting the brittleness of the formation of the β phases. The calculation of Fecrit, ratio of Mn/Fe, quantitative and computed tomography analysis of porosity and Fe plate-like phases, measurement of mechanical and fatigue properties, and fractography analysis were performed in this study. The results show that gravity die casting into a sand mold, and the non-usage of Mn addition or heat treatment, do not have a negative effect on increasing the size of the Fe-rich plate-like phases. The longest Fe-rich phases have limited the pore growth and ratios, but their higher thickness led to greater porosity formation. The mechanical and fatigue properties correlate with the Fecrit level and the highest were for the experimental alloy with 0.454 wt.% of Fe. The experimental results confirmed the fact that if the Fe plate-like phases have a length of up to 50 µm, the fatigue properties depend more on the size of porosity. If the length of the Fe needles is more than 50 µm, then the properties are mainly affected by the length of these Fe phases.

FATIGUE STRENGTH IMPROVEMENT BY PEENING TREATMENT IN DEGASSING PROCESSED CAST ALUMINUM ALLOYS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3593-3598 ◽  
Author(s):  
YASUO OCHI ◽  
KIYOTAKA MASAKI ◽  
TAKASHI MATSUMURA ◽  
YOHEI KUMAGAI ◽  
TATSUHIKO HAMAGUCHI ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Aluminum Alloys ◽  
Shot Peening ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Laser Peening ◽  
Cast Aluminum ◽  
Cast Aluminum Alloys ◽  
Rotating Bending Fatigue ◽  
Cast Alloys

Rotating bending fatigue tests were carried out in order to investigate effects of shot peening and laser peening treatment on fatigue properties of degassing processed cast aluminum alloys. Degassing was useful for decreasing cast defects and increasing the range of fatigue life and fatigue strength at 107 cycles compared with those of non-degassed cast alloys. The shot peening and the laser peening treatments also showed remarkable effects for increasing the resistance of crack propagation behaviors and improving the fatigue strength of the degassing processed cast aluminum alloys.

Possibilities to Apply Friction Stir Processing FSP in Surface Engineering

2021 ◽  
Vol 890 ◽  
pp. 56-65
Author(s):  
Cristian Ciucă ◽  
Lia Nicoleta Boțilă ◽  
Radu Cojocaru ◽  
Ion Aurel Perianu
Keyword(s):  
Aluminum Alloys ◽  
Friction Stir Processing ◽  
Surface Engineering ◽  
Copper Alloys ◽  
Welding Process ◽  
Industrial Applications ◽  
Process Conditions ◽  
Cast Aluminum ◽  
Friction Stir ◽  
Cast Aluminum Alloys

The results obtained by ISIM Timisoara to the development of the friction stir welding process (FSW) have supported the extension of the researches on some derived processes, including friction stir processing (FSP). The experimental programs (the researches) were developed within complex research projects, aspects regarding the principle of the process, modalities and techniques of application, experiments for specific applications, being approached. The paper presents good results obtained by friction stir processing of cast aluminum alloys and copper alloys. The optimal process conditions, optimal characteristics of the processing tools were defined. The complex characterization of the processed areas was done, the advantages of the process applying being presented, especially for the cast aluminum alloys: EN AW 4047, EN AW 5083 and EN AW 7021. The characteristics of the processed areas are compared with those of the base materials. The results obtained are a solid basis for substantiating of some specific industrial applications, especially in the automotive, aeronautical / aerospace fields.

Pore Size Distribution and the Fatigue Properties of Several Cast Aluminum Alloys

2010 ◽  
Vol 139-141 ◽  
pp. 251-254
Author(s):  
Yuan Bin Zhang ◽  
Hui Luo ◽  
Tong Guang Zhai
Keyword(s):  
Aluminum Alloys ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Fatigue Testing ◽  
Ambient Air ◽  
Fatigue Properties ◽  
Materials Testing ◽  
Cast Aluminum ◽  
Cast Aluminum Alloys

The population and size of porosities in three kinds of cast aluminum alloys, i.e. A713, A356T6-1 and A356T6-2, were statistically measured using a commercial software Spirit, and several distribution functions were tried to fit the cumulative pore size distribution data. It was found that a general extreme value (GEV) distribution function was the most appropriate function to quantify the cumulative pore size distribution in these cast aluminum alloys. The stress-number of cycles to failure (S-N) curves of these alloys were characterized by four point bend fatigue testing on MTS810 materials testing system, with the parameter f=20Hz, R=0.1, and in ambient air. The fatigue strength of A713, A356T6-1 and A356T6-2 aluminum alloy was measured to be 94.5 MPa, 150.6MPa and 117.3MPa respectively. The fatigue properties of these alloys could not be evaluated just by population and size distribution of the pores, the microstructure state, shape and position of pores, and other weakest links that may initiate a fatigue crack should be taken into account synthetically.

Effects of microstructural heterogeneity on fatigue properties of cast aluminum alloys

2020 ◽  
Vol 27 (3) ◽  
pp. 674-697 ◽  
Author(s):  
Yi-nan Jiao ◽  
Yi-fan Zhang ◽  
Shi-qing Ma ◽  
De-li Sang ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Fatigue Properties ◽  
Cast Aluminum ◽  
Microstructural Heterogeneity ◽  
Cast Aluminum Alloys

scholarly journals Corrosion of Cast Aluminum Alloys: A Review

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1384
Author(s):  
C. Berlanga-Labari ◽  
M. V. Biezma-Moraleda ◽  
Pedro J. Rivero
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Eutectic Silicon ◽  
Protective Effects ◽  
Cast Aluminum ◽  
Cast Aluminum Alloys ◽  
Aluminum Cast Alloys ◽  
Cast Alloys ◽  
Semi Solid ◽  
Plasma Electrolytic

Research on corrosion resistance of cast aluminum alloys is reviewed in this article. The effect of the main microstructural features of cast aluminum alloys such as secondary dendrite arm spacing (SDAS), eutectic silicon morphology, grain size, macrosegregation, microsegregation, and intermetallic compounds is discussed. Moreover, the corrosion resistance of cast aluminum alloys obtained by modern manufacturing processes such as semi-solid and additive manufacturing are analyzed. Finally, the protective effects provided by different coatings on the aluminum cast alloys—such as anodized, plasma electrolytic oxidation (PEO), and laser—is reviewed. Some conclusions and future guidelines for future works are proposed.

scholarly journals A Comprehensive Understanding of Electro-Fermentation

Fermentation ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 92 ◽  
Author(s):  
Drishti Dinesh Bhagchandanii ◽  
Rishi Pramod Babu ◽  
Jayesh M. Sonawane ◽  
Namita Khanna ◽  
Soumya Pandit ◽  
...  
Keyword(s):  
Metabolic Pathways ◽  
Biomass Yield ◽  
Carbon Chain ◽  
Industrial Applications ◽  
Chain Elongation ◽  
Comprehensive Understanding ◽  
Specific Product ◽  
Microbial Strains ◽  
Metabolic Reactions ◽  
Almost All

Electro-fermentation (EF) is an upcoming technology that can control the metabolism of exoelectrogenic bacteria (i.e., bacteria that transfer electrons using an extracellular mechanism). The fermenter consists of electrodes that act as sink and source for the production and movement of electrons and protons, thus generating electricity and producing valuable products. The conventional process of fermentation has several drawbacks that restrict their application and economic viability. Additionally, metabolic reactions taking place in traditional fermenters are often redox imbalanced. Almost all metabolic pathways and microbial strains have been studied, and EF can electrochemically control this. The process of EF can be used to optimize metabolic processes taking place in the fermenter by controlling the redox and pH imbalances and by stimulating carbon chain elongation or breakdown to improve the overall biomass yield and support the production of a specific product. This review briefly discusses microbe-electrode interactions, electro-fermenter designs, mixed-culture EF, and pure culture EF in industrial applications, electro methanogenesis, and the various products that could be hence generated using this process.

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