On material flow and aspects of structural modification during direct and indirect extrusion of aluminium alloy

Niu, Lanqiang; Velay, Xavier; Sheppard, T.

doi:10.1179/1743284711y.0000000059

Cited by 4 publications

(1 citation statement)

References 20 publications

(40 reference statements)

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“…Owing to the complexity of the instantaneous flow process and the limitation of the test condition at microscale at elevated temperatures, numerical simulation has been regarded as a powerful tool for the better understanding of the infiltration process. [10][11][12] However, most literatures reported mainly focus on chemistry and biotechnology at the microscale. 13,14 Mourhatch et al 15 and Pfahler et al 16 revealed that the flow behaviours at microscale are quite different from that at macroscale and suggested that the internal forces should be considered during microchannel infiltration process.…”

Section: Introductionmentioning

confidence: 99%

Microscale analysis of influence of wettability on flow behaviours of molten Cu infiltrating into W channel

Bai

2014

Materials Science and Technology

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In order to better understand the effect of the wettability between Cu and W on the infiltration process during the fabrication of CuW alloy, the flow patterns of molten Cu in the W microchannel at four different contact angles between Cu and W were simulated by finite volume method based on the modified Navier–Stokes equation, and the effect of Co content in molten Cu on the flow front was studied as well. The results show that the less contact angle between Cu and W increases the differential and negative pressures generated at the flow front and thus increases the flow velocity and decreases the infiltration time during the fabrication process of CuW alloy. However, the less contact angle is easier to cause a larger negative pressure with the progress of the infiltration process, which is not favourable for the filling of molten Cu in the W channel. In addition, Co addition can accelerate the flow of molten Cu in the W channel due to the increased differential pressure.

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Section: Introductionmentioning

confidence: 99%

Microscale analysis of influence of wettability on flow behaviours of molten Cu infiltrating into W channel

Bai

2014

Materials Science and Technology

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State-of-the-art of extrusion welding and proposal of a method to evaluate quantitatively welding quality during three-dimensional extrusion process

et al. 2016

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A Damage Mechanics Approach to Simulate Butterfly Wing Formation Around Nonmetallic Inclusions

Moghaddam

Sadeghi

Weinzapfel³

et al. 2014

Journal of Tribology

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Nonmetallic inclusions such as sulfides and oxides are byproducts of the steel manufacturing process. For more than half a century, researchers have observed microstructural alterations around the inclusions commonly referred to as “butterfly wings.” This paper proposes a model to describe butterfly wing formation around nonmetallic inclusions. A 2D finite element model is developed to obtain the stress distribution in a domain subject to Hertzian loading with an embedded nonmetallic inclusion. It was found that mean stress due to surface traction has a significant effect on butterfly formation. Continuum damage mechanics (CDM) was used to investigate fatigue damage and replicate the observed butterfly wing formations. It is postulated that cyclic damage accumulation can be the reason for the microstructural changes in butterflies. A new damage evolution equation, which accounts for the effect of mean stresses, was introduced to capture the microstructural changes in the material. The proposed damage evolution law matches experimentally observed butterfly orientation, shape, and size successfully. The model is used to obtain S-N results for butterfly formation at different Hertzian load levels. The results corroborate well with the experimental data available in the open literature. The model is used to predict debonding at the inclusion/matrix interface and the most vulnerable regions for crack initiation on butterfly sides. The proposed model is capable of predicting the regions of interest in corroboration with experimental observations.

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On material flow and aspects of structural modification during direct and indirect extrusion of aluminium alloy

Cited by 4 publications

References 20 publications

Microscale analysis of influence of wettability on flow behaviours of molten Cu infiltrating into W channel

Microscale analysis of influence of wettability on flow behaviours of molten Cu infiltrating into W channel

State-of-the-art of extrusion welding and proposal of a method to evaluate quantitatively welding quality during three-dimensional extrusion process

A Damage Mechanics Approach to Simulate Butterfly Wing Formation Around Nonmetallic Inclusions

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