Development of A New Type of Functional NiAl-base Alloys

具有B_2型（C_sC_1）结构的镍、钴铝化合物β相具有作为一种新型多功能材料的潜力，如高温强度、良好的抗氧化性、形状记忆、高阻尼能力、stc.然而，其延展性的不足限制了其作为功能材料的应用。本课题的目的是开发一种新型的β基多功能材料，通过控制显微组织来提高塑性。1.热力学分析实验测定了Ni-Al-Mn，Ni-Al-Co和Ni-Al-Fe系中富Ni相的相平衡，2.高温材料通过对高温合金的显微组织控制，3.形状记忆与阻尼材料Ni-Al-X合金β相马氏体相变温度B2*L1_0（Ms）（X：Ti、V、Cr、Mn、Fe、Co、Cu等）结果表明，Mn、Fe、Co的加入有利于提高Ms温度。利用这些Ms值和相平衡数据，在Ni-Al-Fe-Mn四元系中研制出了在100 ~ 600 ℃高温下工作的γ（Al）+ β双相韧性形状记忆合金。这些两相形状记忆合金不仅具有高的阻尼性能，而且比其它阻尼材料具有更高的屈服强度。

The beta phase of nickel and cobalt aluminides with B2-type (C_sC1) structure have the potential to serve as a new type of materials with multi-functional properties such as high temperature strength, good oxidation resistance, shape memory, high damping capacity, stc. However the lack of ductility limits their application as the functional materials. The aim of this project is to develop a new type of beta base multi-functional materials improved ductility by microstructural control.1.Thermodynamic AnalysisThe phase equilibria of the Ni-rich portion in the Ni-Al-Mn, Ni-Al-Co and Ni-Al-Fe systems have been experimentally determined, and thermodynamic analysis on basis of the experimental data have been done.2.High Temperature MaterialsBy means of microstructural control due to the information of the thermodynamic analysis, ductile gamma'(L1_2)+beta two-phase alloy which has both excellent oxidation resistance and high temperature strength has been developed by the conventional fabrication method combined with a thermomechanical heat treatment.3.Shape Memory and Damping MaterialsMartensitic transformation temperatures in the beta phase B2*L1_0 (Ms) of the Ni-Al-X (X : Ti, V,Cr, Mn, Fe, Co, Cu, etc.) systems were determined by DSC.It was clarified that adding Mn, Fe and Co are useful to increase the Ms temperature. By means of these data of Ms and phase equilibria, ductile gamma(Al)+beta two-phase shape memory alloys which operate at high temperatures between 100 and 600ﾟC have been developed in the Ni-Al-Fe-Mn quaternary system. These two-phase shape memory alloys show not only high damping capacity, but also higher yield strength than the other damping materials.