稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2010年
4期
642-646
,共5页
多孔NiTi形状记忆合金%粉末冶金法%孔结构%形状记忆性能
多孔NiTi形狀記憶閤金%粉末冶金法%孔結構%形狀記憶性能
다공NiTi형상기억합금%분말야금법%공결구%형상기억성능
porous NiTi shape memory alloy%powder metallurgy%pore structure%shape-memory behavior
采用粉末烧结法制备了高孔隙率的Ti-50.8 at%Ni形状记忆合金(SMA),并对其显微组织和形状记忆性能进行了研究.结果表明,用该种方法制备的多孔合金样品具有孔隙分布均匀以及开孔率高的特点,其平均孔径在200 μm左右.合金组织主要由奥氏体NiTi相(B2)和单斜马氏体NiTi相(B19')组成.循环加载-卸载实验结果表明,该多孔材料能表现出一定的形状记忆效应,而且形状记忆效应随孔隙率的增加而降低.
採用粉末燒結法製備瞭高孔隙率的Ti-50.8 at%Ni形狀記憶閤金(SMA),併對其顯微組織和形狀記憶性能進行瞭研究.結果錶明,用該種方法製備的多孔閤金樣品具有孔隙分佈均勻以及開孔率高的特點,其平均孔徑在200 μm左右.閤金組織主要由奧氏體NiTi相(B2)和單斜馬氏體NiTi相(B19')組成.循環加載-卸載實驗結果錶明,該多孔材料能錶現齣一定的形狀記憶效應,而且形狀記憶效應隨孔隙率的增加而降低.
채용분말소결법제비료고공극솔적Ti-50.8 at%Ni형상기억합금(SMA),병대기현미조직화형상기억성능진행료연구.결과표명,용해충방법제비적다공합금양품구유공극분포균균이급개공솔고적특점,기평균공경재200 μm좌우.합금조직주요유오씨체NiTi상(B2)화단사마씨체NiTi상(B19')조성.순배가재-사재실험결과표명,해다공재료능표현출일정적형상기억효응,이차형상기억효응수공극솔적증가이강저.
Porous Ti-50.8 at%Ni shape memory alloys (SMA) with high porosity were prepared by the powder metallurgical technique, and the microstructure and shape memory behavior of the porous alloys were investigated. The results indicate that the porous alloys prepared by this method exhibit a homogenous pore-space structure with a high open-cell ratio, and the average pore size is about 200 (m. The microstructure is mainly composed of Austenitic NiTi phase (B2) and monoclinic Martensite NiTi (B19'). The cyclic load-unload recovery curves reveal that the porous alloy can exhibit certain shape-memory effect, which decreases with the increase of the porosity.
