Triaxial Compression on Semi-solid Alloys
Triaxial Compression on Semi-solid Alloys
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DOI：
10.1007/s11661-021-06213-9
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
F. Altuhafi;C. O’Sullivan;P. Sammonds;T. Su;C. Gourlay
中科院分区：
文献类型：
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作者：
F. Altuhafi;C. O’Sullivan;P. Sammonds;T. Su;C. Gourlay
糊状区域的多轴压缩发生在各种加压铸造工艺中。在这里，我们提出了一种用于半固态合金的排水三轴压缩装置，该装置允许液体响应各向同性或三轴压缩而被吸入或从样品中排出。该装置用于测量球状半固态 Al-15 wt pct Cu 在 70 至 85 vol% 固体的等温三轴压缩过程中与压力相关的流动应力和体积响应。对应力路径和应力体积数据的分析表明，固体分数和平均有效压力的组合决定了材料是否会经历剪切引起的膨胀或收缩。将结果与临界状态土力学（CSSM）框架进行比较，并讨论等轴半固态合金与土之间行为的异同。
Multi-axial compression of the mushy zone occurs in various pressurized casting processes. Here, we present a drained triaxial compression apparatus for semi-solid alloys that allow liquid to be drawn into or expelled from the sample in response to isotropic or triaxial compression. The rig is used to measure the pressure-dependent flow stress and volumetric response during isothermal triaxial compression of globular semi-solid Al-15 wt pct Cu at 70 to 85 vol pct solid. Analysis of the stress paths and the stress–volume data show that the combination of the solid fraction and mean effective pressure determines whether the material undergoes shear-induced dilation or contraction. The results are compared with the critical state soil mechanics (CSSM) framework and the similarities and differences in behavior between equiaxed semi-solid alloys and soils are discussed.