Densification behavior of a fine-grained MgAl2O4 spinel during spark plasma sintering (SPS)
Densification behavior of a fine-grained MgAl2O4 spinel during spark plasma sintering (SPS)
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DOI：
10.1016/j.scriptamat.2010.06.012
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发表时间：
2010-09
影响因子：
6
通讯作者：
K. Morita;Byung‐Nam Kim;H. Yoshida;K. Hiraga
中科院分区：
文献类型：
--
作者：
K. Morita;Byung‐Nam Kim;H. Yoshida;K. Hiraga
尖晶石在放电等离子烧结过程中的致密化速率可以用应力指数从⩾4到≈1随密度的增加而减小来表征。透射电子显微镜观察表明，在低密度区可观察到由部分位错引入的层错，但在高密度区仅能观察到由部分位错引入的层错。这些结果表明，随着密度的增加，主要致密化机制发生变化，由部分位错运动引起的塑性流动转变为扩散蠕变。
The densification rate of a spinel during spark plasma sintering can be characterized by the decreasing stress exponent from ⩾4 to ≈1 as the density increases. Transmission electron microscopy observations showed that stacking faults introduced by partial dislocations are observed in a low-density region, but limited in a high-density region. These results suggest that the dominant densification mechanism changes with density, from plastic flow caused by a partial dislocation motion to diffusion creep as the density increases.