Synchrotron Radiography Studies of Shear-Induced Dilation in Semisolid Al Alloys and Steels

Synchrotron Radiography Studies of Shear-Induced Dilation in Semisolid Al Alloys and Steels
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半固态铝合金和钢剪切诱发膨胀的同步辐射照相研究

DOI:
10.1007/s11837-014-1029-5
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发表时间:
2014
期刊:
JOM
影响因子:
2.6
通讯作者:
Gourlay C
Gourlay C
中科院分区:
材料科学3区
文献类型:
--
作者:
Gourlay C

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为了进一步减少铸造缺陷和优化铸造工艺,需要更好地理解凝固微结构对载荷的响应。本文综述了同步辐射照相技术在薄样品直接剪切室中直接测量半固态合金变形微观力学的研究。结果表明,剪切诱导膨胀(也称为雷诺膨胀)发生在半固态合金的形态范围从等轴枝晶到球状,在固体分数从枝晶凝聚点到~90%固体,它发生在铝合金和碳钢。离散元法模拟,处理凝固微观结构作为粒状材料,然后用于探索半固态合金中的结晶性的起源。
An improved understanding of the response of solidifying microstructures to load is required to further minimize casting defects and optimize casting processes. This article overviews synchrotron radiography studies that directly measure the micromechanics of semisolid alloy deformation in a thin-sample direct-shear cell. It is shown that shear-induced dilation (also known as Reynolds’ dilatancy) occurs in semisolid alloys with morphologies ranging from equiaxed-dendritic to globular, at solid fractions from the dendrite coherency point to ~90% solid, and it occurs in both Al alloys and carbon steels. Discrete-element method simulations that treat solidifying microstructures as granular materials are then used to explore the origins of dilatancy in semisolid alloys.
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发表时间: 2002-07
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影响因子: --
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