Kirjoittaja Aihe: Aluminum-Silicon Casting Alloys  (Luettu 186 kertaa)

Aluminum-Silicon Casting Alloys


This atlas provides an in-depth understanding of the metallurgy and fracture behavior of aluminum-silicon casting alloys, which are used in a wide variety of automotive, aerospace, and consumer product applications. The atlas includes over 300 high-definition microfractographs of fracture profiles and fracture surfaces, accompanied with detailed descriptions and analysis of the fracture features and their significance in the selection, processing, properties, and performance of the alloy. The microfractographs are described and classified according to criteria described in detail in the introductory chapters in the book. The factors determining the fracture mechanism in these alloys, on the basis of their physical and mechanical properties and fracture mechanics, are described and analyzed. The set of micrographs in this atlas include several unique features: classification according to the alloy and its processing history, detailed analysis of selected microregions of the fracture surface, reference of the fracture features to the phase constituents of the alloy, and high resolution and high microscopic magnification of the SEM images. This book will be of great value to anyone involved in the selection, processing, application, testing, or evaluation of aluminum-silicon castings. The target audience includes metallurgists, foundry personnel, failure analysts, purchasers of castings, researchers in physical and mechanical metallurgy, students, and educators.Get more news about Aluminium-silicon Alloy,you can vist our website!

Cast aluminium-silicon (Al-Si) alloys are used extensively in various industries due to their advantageous properties such as high strength-to-weight ratio, good corrosion resistance and high fluidity which allows for defect-free complex castings. Under normal casting conditions the microstructure is composed of silicon needles in an aluminium matrix. These provide propagation planes for defects and therefore deteriorate the mechanical properties. By adding certain elements, usually strontium (Sr), the Si needles change to fibres, however this is also known to increase porosity in castings. The mechanism that causes the change from needles to fibres has been extensively debated and a number of theories can be found in the literature, revolving around both the nucleation and growth stages of eutectic Si. In this thesis high purity materials were used to prepare hypoeutectic unmodified and Sr-modified Al-Si alloys to which cerium (Ce) or yttrium (Y) were added and differences between these alloys in the solidification progression and microstructure were investigated. The addition of 1% Ce or Y to unmodified Al-Si produced a partially modified eutectic Si, whilst full modification was retained when these were added to Sr-modified Al-Si. These additions also resulted in a significant decrease in the eutectic growth temperatures and in the formation of Al2Si2Ce or Al2Si2Y intermetallic phases. It is suggested that similar to the Al2Si2Sr in Sr-modified Al-Si these intermetallic phases nucleate on aluminium phosphide (AlP) and thus do not allow for the nucleation of eutectic silicon on this phase. Three dimensional atom probe tomography (3D APT) of Y-partially-modified Al-Si showed a preferential segregation of yttrium within the eutectic Si. By means of optical microscopy and high resolution x-ray computed tomography (XCT), it was also demonstrated that the Sr modification significantly increases the porosity in cast Al-Si alloys which is reduced following the rare-earth additions.

Vs: Aluminum-Silicon Casting Alloys
Vastaus #1 11.09.23 - 03:12
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Vs: Aluminum-Silicon Casting Alloys
Vastaus #3 03.10.23 - 10:07
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Vs: Aluminum-Silicon Casting Alloys
Vastaus #4 02.12.23 - 13:23
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Vs: Aluminum-Silicon Casting Alloys
Vastaus #5 02.02.24 - 16:07
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