Influence of Precipitated Direction of the Second Phase on Shape Memory
WEN Yuhua; ZHANG Wei ; LI Ning; XIE Wenling; WANG Shanhua
College of Manufacturing Science and Engineering; Sichuan University;
Cite this article:
WEN Yuhua; ZHANG Wei; LI Ning; XIE Wenling; WANG Shanhua. Influence of Precipitated Direction of the Second Phase on Shape Memory. Acta Metall Sin, 2006, 42(11): 1217-1220 .
Abstract To develop Fe-based shape memory alloys with high revovery strain free of training, the effects of direct ageing and strain ageing on the precipitation of second phases, the martensite transformation and the shape memory effect in an Fe-13.53Mn-4.86Si-8.16Cr-3.82Ni-0.16C alloy were investigated. The analysis of SEM and X-ray diffraction showed that after ageing lots of Cr23C6 precipitated and the precipitation of second phases through direct aging is unidirectional, while the precipitation of second phases through strain ageing is directional. At the same aging time, the amount of second phases through strain ageing is much more than that through the direct ageing, and the size of second phases is half of that through the direct ageing. The shape memory effect can be remarkably improved through both the strain ageing and strain ageing at the optimal aging time. The shape memory effect after strain ageing is much better than that after the direct aging at the same aging time. The Fe-based shape memory alloys with high revovery strain free of training can be fabricated through controlling the precipitation with direction of second phases.
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