Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys

Uludağ, Muhammet; Çetin, Remzi; Dışpınar, Derya; Tiryakioğlu, Murat

doi:10.3390/met7050157

Cited by 36 publications

(15 citation statements)

References 45 publications

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“…The main observation can be seen on the RPT samples cross-sections ( figure 1) where the size of pores is getting smaller and the number of pores is decreasing. Uludag [18] had reported a similar finding where the Sr modified melt had shown an increased number of smaller pores. Liu [8] also reported the same findings.…”

Section: Introductionmentioning

confidence: 64%

Sr addition and its effect on the melt cleanliness of A356

Atakav

Gürsoy

Erzi

et al. 2020

Mater. Res. Express

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Strontium modification of Al-Si alloys has known to have several beneficial effects such as increased feedability, the formation of fibrous Si and increased mechanical properties. However, in the presence of Sr, during melting and holding durations, the oxide structure of the dross may change which leads to several problems during casting operations. In this work, the amount of Sr was changed and the melt was held for 1 h. Reduced Pressure Test (RPT) was used to asses melt quality change and it was found that cleanliness was increased due to the fading of Sr.

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Section: Introductionmentioning

confidence: 64%

Sr addition and its effect on the melt cleanliness of A356

Atakav

Gürsoy

Erzi

et al. 2020

Mater. Res. Express

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“…Due to these bifilms that are extrinsic, nucleation is completely bypassed, and pores form simply by the opening of bifilms [6]. There is growing evidence in the literature on the role of bifilms on causing pores [6,13,[16][17][18][19][20][21][22][23][24][25][26] and leading to hot tears [27,28]. Oxides are inevitable on the surface of liquid aluminum and serve as a protective film over the liquid.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys

Tiryakioğlu

2020

Materials

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The metallurgy of cast aluminum alloys has always been considered to be different from that of wrought alloys. Metallurgists have been taught that pores are intrinsic in cast aluminum alloys and that mechanical properties in cast aluminum alloys are controlled by dendrite arm spacing, the presence of Fe-bearing particles, and the size of Si particles in Al–Si alloys, which fracture and debond during deformation, leading to premature failure. Whether these effects are intrinsic or extrinsic, i.e., mere correlations due to the structural quality of castings, is discussed in detail. Ideal properties are discussed, based on findings presented mostly in physics literature. Pores and hot tears in aluminum castings are extrinsic. Moreover, the effect of dendrite arm spacing on elongation, precipitation, and subsequent fracture of β–Al5FeSi platelets, and finally Si particle fracture and debonding are all extrinsic. A fundamental change in how we approach the metallurgy of cast aluminum alloys is necessary.

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“…Thereby the porosity was decreased since bifilms were unable to unravel. Uludag et al [26][27][28][29] studied the influence of Sr on bifilm index. It was found that addition of Sr had decreased the size and length of pores which was attributed to the healing of bifilms as was reported by Ramin [25,30,31].…”

Section: Introductionmentioning

confidence: 99%

Determination of Acceptable Quality Limit for Casting of A356 Aluminium Alloy: Supplier’s Quality Index (SQI)

Erzi

Gürsoy

Yüksel

et al. 2019

Metals

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Aluminium and its alloys have been widely used in the automotive industry for some time and A356 is one of the most popular aluminium alloys today in the sector. It contains approximately 7 wt.% Si and 0.3 wt.% Mg. Due to the defects that may be present in the cast parts, expected mechanical properties may not be reached and this alloy may perform in service under its potential. In a low pressure die casting, several precautions have to be taken in order to produce high quality and defect-free castings. Temperature of casting and the schemical composition of the melt is recorded continuously. Die temperature, pressure levels and their durations are optimized; degassing and fluxing operations are performed. Yet, regardless of the precautions, there could still be rejected parts. It is becoming clear that a good quality raw material is one of the most underrated points of the industry and that the starting material has a great effect on the final product and it should be taken in to account more seriously. Therefore, regarding the first rule of Campbell's 10 Rules of Casting, in this study, the quality of the starting material of supply chains for a wheel manufacturer was investigated. Chemical compositions were compared, fluidity tests, mechanical tests and bifilm indexes of these various sources and ingots were measured and a final quality index was proposed to create a reference for the quantification of quality of supplier's ingots. This new index was compared with the rejection rates.

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Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys

Cited by 36 publications

References 45 publications

Sr addition and its effect on the melt cleanliness of A356

Sr addition and its effect on the melt cleanliness of A356

Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys

Determination of Acceptable Quality Limit for Casting of A356 Aluminium Alloy: Supplier’s Quality Index (SQI)

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