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arXiv 1209.1608cond-mat.mtrl-sci
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剧烈塑性形变对FeSiTi钢沉淀硬化的影响

Influence of severe plastic deformation on the precipitation hardening of a FeSiTi steel

Amélie Fillon, Xavier Sauvage, Arnaud Pougis, Olivier Bouaziz, David Barbier, Roxane Arruffat, Laszlo Toth

摘要:

晶粒细化和高析出相体积分数(~6at.%)的复合强化效应采用原子探针层析成像和扫描透射电镜研究了时效前SPD处理对FeSiTi合金力学性能的影响。结果表明,细化的显微组织影响的析出动力学和二次硬化金属间相,观察到成核的位错和亚晶界上的非均匀的空间分布。结果表明,连续进行这两种强化机制的合金表现出较低的机械强度的增加比一个简单的估计的基础上的两个单独的强化机制的总和。

英文摘要:

The combined strengthening effects of grain refinement and high precipitated volume fraction (~6at.%) on the mechanical properties of FeSiTi alloy subjected to SPD processing prior to aging treatment were investigated by atom probe tomography and scanning transmission electron microscopy. It was shown that the refinement of the microstructure affects the precipitation kinetics and the spatial distribution of the secondary hardening intermetallic phase, which was observed to nucleate heterogeneously on dislocations and sub-grain boundaries. It was revealed that alloys successively subjected to these two strengthening mechanisms exhibit a lower increase in mechanical strength than a simple estimation based on the summation of the two individual strengthening mechanisms.

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