The Influence of the Cooling Rate on the Type of the Intermetallic Phases in the Aluminium Alloys of the 3XXX (AlMnMgSi) Group

2006 ◽  
pp. 282-289
Author(s):  
Tomasz Stuczyński ◽  
Marzena Lech-Grega
Keyword(s):  
Cooling Rate ◽  
Aluminium Alloys ◽  
Intermetallic Phases

The Failure Degradation of Recycled Aluminium Alloys with High Content of β-Al5FeSi Intermetallic Phases

2020 ◽  
Vol 403 ◽  
pp. 97-102
Author(s):  
Denisa Medvecká ◽  
Lenka Kuchariková ◽  
Milan Uhríčik
Keyword(s):  
Aluminium Alloys ◽  
Cast Alloy ◽  
Intermetallic Phases ◽  
X Ray ◽  
Fracture Surfaces ◽  
Phase Lead ◽  
Micro Cracks ◽  
Fe Content ◽  
Increased Risk ◽  
Cast Alloys

In this study, the effect of the β-Al5FeSi phases on fracture surfaces in secondary AlSi7Mg0.3 cast alloys with common and higher amount of iron was investigated. Iron addition caused the formation of different Fe-rich intermetallic phases in aluminium alloys. Components made of secondary aluminium alloys commonly have a higher amount of such phases. Sharp needles as β-Al5FeSi phase lead to initiate stress tension, thereby contributing to increased risk of micro-cracks formation on the fracture surfaces. To determine the effect of β-Al5FeSi to fracture surfaces of AlSi7Mg0.3 cast alloy, SEM microscopy with energy-dispersive X-ray spectroscopy (EDX) was used to study the amount of needles phases, their morphology and violation wave. It was found that increasing Fe content increased the size and the number of Al5FeSi phases. The fractographic analysis of fracture surfaces shows an increasing amount of cleavage fracture in materials with a higher amount of iron, too.

scholarly journals Understanding the Thermodynamics and Crystal Structure of Complex Fe Containing Intermetallic Phases Formed on Solidification of Aluminium Alloys

JOM ◽  
2019 ◽  
Vol 71 (5) ◽  
pp. 1731-1736 ◽  
Author(s):  
Alan Dinsdale ◽  
Changming Fang ◽  
Zhongping Que ◽  
Zhongyun Fan
Keyword(s):  
Crystal Structure ◽  
Aluminium Alloys ◽  
Intermetallic Phases

Microstructural Evolution during Ingot Preheat in 7xxx Aluminium Alloys for Thick Semiproduct Applications

2006 ◽  
Vol 519-521 ◽  
pp. 549-554 ◽  
Author(s):  
Seong Taek Lim ◽  
Yong Yun Lee ◽  
Il Sang Eun
Keyword(s):  
Aluminum Alloys ◽  
Cooling Rate ◽  
Temperature Interval ◽  
Microstructural Evolution ◽  
Aluminium Alloys ◽  
S Phase ◽  
Constitutional Change ◽  
Preheat Temperature ◽  
Quaternary Phase ◽  
M Phase

Recent 7xxx aluminum alloys have been designed for the finite use of thick semiproduct with contolled amount of constituent phases which mostly evolve during ingot preheat. In this study, the effects of constitutional change and preheat conditions of 7175 and 7050 type alloys on the evolution of constituent phases [M-, T-, S-phase and dispersoid] are presented. The constiuents evolve depending on the constitutional effect, primarily the change of Zn:Mg ratio, preheat condition comprising temperature and cooling rate following preheat. T- and M-phase are reprecipitated during cooling after preheat, depending on the alloy constitutions. S-phase is evolved depending on the constitution and preheat temperature, rather than preheat cooling rate. Prominent precipitation temperature interval of constituents are discussed in view of quaternary phase evolutions. In addition, evolutions of dispersoids together with M-phase are discussed. Specific alloy designs and preheat conditions could provide controlled microstructures for the thick 7xxx semiproducts.

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