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Development of Ni-Al Base Shape Memory Alloys with Enhanced

增强型镍铝基形状记忆合金的研制

基本信息

批准号：
02555144
负责人：
NISHIZAWA Taiji
金额：
$ 8.45万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555144/
关键词：
Shape memory effect Ni-Al base alloys B2 structure Llo structure Transformation temp Ductilization Intermetallic compound Thermoelastic martensite Ni基合金 Llo構造形状記憶合金マルテンサイト変態 NiーAlーFe合金状態図熱弾性規則相 Ll_0構造

项目摘要

In order to develop the Ni-Al base shape memory alloys with enhanced ductility, the hot workability, microstructure, shape memory effect and mechanical properties in the Ni-Al-Fe, Ni-Al-Mn and Ni-Al-Fe-Mn systems were investigated. The results obtained are as follows :(1) A small amount of fcc phase formed by the addition of Fe and Mn has a drastic effect not only on the hot workability but also on the tensile ductility at room temperature. The enhancement in ductility is mainly due to the modification of beta-phase grains by the coexistence of phase.(2) Ductile shape memory alloys based on the bate phase matrix in the Ni-Al-Fe, Ni-Al-Mn and Ni-Al-Fe-Mn systems have been developed by promoting the formation of fcc phase in the grain boundary of matrix phase. The two-phase beta+gamma alloys show high degree of shape recovery, which depends on the volume fraction of the phase. Normal pseudo-elastic behavior above Ms is not detected unambiguously in these alloys.(3) The transformation temperatures can be controlled by adjusting the annealing temperature in the beta+gamma two-phase region. The maximum operating temperatures for shape memory alloys in the Ni-Al-Fe and Ni-Al-Mn systems are 150ﾟC and 700ﾟC, respectively.(4) Although these alloys have not shown in the complete shape recovery, they are attractive for the new type of shape memory alloys which operate at rather high temperatures.

为了开发具有更高塑性的Ni-Al基形状记忆合金，研究了Ni-Al-Fe、Ni-Al-Mn和Ni-Al-Fe-Mn系形状记忆合金的热加工性能、显微组织、形状记忆效应和力学性能。结果表明：(1)添加少量的铁、锰形成的面心立方相不仅对材料的热加工性能有很大影响，而且对材料的室温拉伸塑性也有很大的影响。(2)在Ni-Al-Fe、Ni-Al-Mn和Ni-Al-Fe-Mn系中，通过促进晶界面心立方相的形成，制备了以贝特相为基体的韧性形状记忆合金。两相β+γ合金表现出较高的形状回复率，这与相的体积分数有关。在这些合金中没有明确地检测到高于ms的正常伪弹性行为。(3)可以通过调节β+伽马两相区的热处理温度来控制相变温度。在Ni-Al-Fe和Ni-Al-Mn系中，形状记忆合金的最高工作温度分别为150ﾟC和700ﾟC。(4)虽然这两种合金还没有表现出完全的形状恢复，但它们对于在较高温度下工作的新型形状记忆合金是有吸引力的。