ECAP工艺细化铁基形状记忆合金研究
Structural refinement of the Fe-based shape memory alloy by equal channel angular pressing(ECAP)
本文研究了等通道转角挤压（Equal Channel Angular Pressing，简称 ECAP）技术细化Fe基形状记忆合金。研究结果发现：300℃下Fe-17.8Mn-4.73Si-7.80Cr-4.12Ni(wt%)第一道次挤压力为78KN，与理论计算值70.6KN接近，第二道次挤压力上升明显，达到240KN。金相观察显示挤压后的合金晶粒沿剪切方向拉长，TEM分析显示700℃退火30min后再结晶形成0.3μm左右细小晶粒，与未挤压试样相比晶粒明显细化。ECAP挤压极大的提高了材料的力学性能，屈服强度由未挤压时220MPa提高到挤压后的890MPa；挤压后退火的合金恢复率略有提高，在预变形ε＝6.5％时，获得η＝74％的形状恢复率。
Structural refinement of the Fe-based shape memory alloy by equal channel angular pressing was studied. Results show that the pressing load of Fe-17.8Mn-4.73Si-7.88Cr-4.12Ni(wt%) at 300℃ is 78KN, closing to the theoretical load as 70.6KN, and reaches 240KN in second pressing pass. Grain boundary is elongated with shearing axis and remarkable refined after annealing at700℃ for 30 minutes as TEM micrographs show. The strength of alloy were sharply improved from 220MPa to 890MPa after ECA pressing. The alloys ECAPed and annealed get excellent shape memory effect asη＝74％ when pre-strain asε＝6.5％.
李宁、张伟
材料科学金属压力加工金属学、热处理
等通道转角挤压ECAP铁基形状记忆合金细化
Equal channel angular pressing(ECAP)Fe-based Shape Memory Allyrefinement
李宁,张伟.ECAP工艺细化铁基形状记忆合金研究[EB/OL].(2005-07-21)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/200507-161.点此复制
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