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Microfabrication and Performance of Annealed NiTi Shape Memory Thin Films by Sputtering for Microdevice Applications GONG Feng-fei1 (1.Physics Dept., East China Normal University, Shanghai 200062, China) 摘要:The microfabrication and performance NiTi shape memory thin films for microdevice applications were studied by microfabrication processes, which were compatible with those......
孔隙对NiTi形状记忆合金中B2-R相变影响的相场模拟柯常波1,马骁1,张新平1(1.广东省广州市华南理工大学材料科学与工程学院)摘 要:建立了适用于孔隙NiTi合金中B2-R相变的相场模型,并用该相场模型研究了多孔NiTi合金中B2-R转变的微观组织演化过程以及孔隙率和孔尺寸对R相变体生长动力学行为的影响.多孔NiTi合金中R相变体以相互协调的方式形成"带状"的三维结构和"鱼骨"状的二维组织,变体之间形成的孪晶面包括{101}B2和{001}B2 2种,4组变体相交于<010>B2;这些结果与致密NiTi合金B2-R相变过程相同.多孔NiTi合金中R相优先在孔周围形核,且较大的孔周围有较多的变体形核;R相变体的平均尺寸随孔隙率增大而逐渐减小,随孔径增大而增加;相对于规则圆孔,不规则孔隙可导致R相变体尺寸......
alloy were studied by tensile test and microstructure observation. Using X-ray diffractometry, differential scanning calorimetry (DSC) and semi-quantitative shape memory effect test, the microstructure and shape memory effect were analyzed. It is found that lots of β phase and few α phase are formed in the quenching of Cu-7.5Al-9.7Mn-3.4Zn-0.3Ti-0.14B (mass fraction, %) alloy, a great deal......
analysis indicates that the second phase Ti2Ni at the grain boundaries plays an important role in improving the mechanical properties of TiNiFe shape memory alloys. Key words: shape memory alloy; yield strength; martensitic transformation temperature 1 Introduction NiTi-based shape memory alloys combine good functional and structural properties, such as high strength, corrosion resistance, long......
NiTi形状记忆合金中共格Ni4Ti3沉淀相生长动力学行为的相场法模拟柯常波1,马骁1,张新平1(1.广东省广州市华南理工大学材料科学与工程学院)摘 要:采用基于扩散场理论的宏观相场模型对NiTi形状记忆合金中具有菱方结构的共格Ni4Ti3相的析出及长大过程进行了模拟研究;沉淀相的形貌演化通过求解非守恒参量场...的原因并与相关实验结果吻合.关键词:NiTi形状记忆合金; 共格沉淀相; 生长动力学; 相场法; 形貌演化......
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INFLUENCE OF PROCESSING ON SHAPE MEMORY EFFECT OF Fe-Mn-Si-Ni-C-RE SHAPE MEMORY ALLOY N.C.Si1,L.B.Qi1,Z.H.Jia1 (1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China) Abstract:Effect of carbon, compound RE, quenching temperature, pre-strain and recovery temperature on shape memory effect (SME) of Fe-Mn-Si-Ni-C-RE shape memory alloy was studied by bent......
with a wheel speed of 52 m/s. The uniformity of grain size in heat treated ribbons decreases with increasing wheel speed. Key words: Ti-Ni; melt-spun ribbon; microstructure; shape memory alloy 1 Introduction It has been known that Ti-Ni thin films show shape memory effects comparable to those of bulk materials. The Ti-Ni shape memory alloy (SMA) thin films are expected to be utilized for various......
Trans. Nonferrous Met. Soc. China 22(2012) 90-96 Microstructure evolution and deformation behavior of as-cast NiTi shape memory alloy under compression JIANG Shu-yong, ZHANG Yan-qiu Industrial...: as-cast NiTi; microstructure evolution; deformation behavior; dynamic recrystallization; shape memory alloy 1 Introduction Nickel-titanium shape memory alloy (NiTi SMA) is widely used in engineering......
The shape memory alloy NiTi has been a candidate biomaterial for several years due to its unique thermal shape memory effect, superelasticity, resistance to fatigue and corrosion and high damping... of orthodontic archwires [J]. Angle Orthod, 1999, 69: 433-440. [6] FIRSTOV G S, KUMAR H. Surface oxidation of NiTi shape memory alloy [J]. Biomaterials, 2002, 23: 4863-4871. [7] GENG Fang, SHI Ping......