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外应力对NiTi合金中共格Ni4Ti3沉淀相长大行为影响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:运用相场模型模拟了外加应力对NiTi形状记忆合金中Ni4Ti3沉淀相组织形貌及长大行为的影响.无外加应力作用的时效过程中,4组Ni4Ti3变体均沿着各自对应的(111)B2惯习面从NiTi基体相中析出;而在<111>B2方向施加压应力时,只有一组Ni4Ti3变体从NiTi基体相中析出,其惯习面法线方向平行于外加应力方向;单轴压应力作用下时效时,Ni4Ti3形核数量明显增加.外加单轴压应力可促进Ni4Ti3变体的形核和长大,但并不改变变体的面积分数,长度,宽度以及长度-宽度比等参数随时效时间变化的趋势;压应力增大使变体长度及宽度均略微增加,但均小于无应力作用......
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......
Trans. Nonferrous Met. Soc. China 25(2015) 3315-3322 In situ laser deposition of NiTi intermetallics for corrosion improvement of Ti-6Al-4V alloy M. N. MOKGALAKA1,2, A. P. I. POPOOLA1, S. L... Centre, Pretoria 0001, South Africa Received 5 September 2014; accepted 29 June 2015 Abstract: NiTi intermetallic coatings were fabricated on the surface of Ti-6Al-4V alloy by melting Ni and Ti......
. The simulation results show that, during stress-free aging of the NiTi alloy with a low supersaturation of Ni (i.e., Ti-51.5%Ni), the Ni4Ti3 precipitates exhibit a heterogeneous distribution with a high number density of particles at the grain boundary, leaving most of the grain interiors free of precipitates; while for the NiTi alloy with a high supersaturation of Ni (i.e., Ti-52.5%Ni), the Ni4Ti3......
; NiTi/表面多孔Ti梯度合金坯体的制备流程图 Fig. 1 Schematic diagram of green bodies fabrication process of NiTi/surface porous Ti gradient alloy 利用金相显微镜观察了梯度合金的中间基体,表面多孔层及界面的形貌,图4所示为不同烧结温度下NiTi/表面多孔Ti梯度合金的光学显微照片.从图4可.../surface porous Ti gradient alloy at different sintering temperatures 图5 烧结温度为1000 ℃时NiTi/表面多孔Ti梯度合金的界面形貌和EDS线扫描图 Fig. 5 Interface morphology and EDS chemical composition analysis of NiTi......
下()应力-应变曲线为平滑型曲线. 图3 不同应变速率下NiTi 合金在600℃时的应力-应变曲线 Fig.3 Stress-strain curves of NiTi alloy at 600℃ under different strain rates 应变速率对NiTi合金应力-应变曲线的显著影响是变形过程发生动态再结晶的结果. 在600℃较低应变速率拉伸时... curves of NiTi alloy under condition with and without electric field 在施加电场的流动应力曲线中, 没有形成的波浪形曲线, 表明在形变过程中, 位错增殖的形变硬化和动态回复及再结晶的形变软化同时进行, 曲线呈平滑的稳态特征. 说明在变形过程中, 施加电场使得材料的屈服强度降低, 位错的启动能减小, 位错更容易运动和增殖, 即位错......
November 2011; accepted 7 April 2012 Abstract: Dissimilar metal joining between NiTi shape memory alloy (SMA) and stainless steel was conducted. A cluster of NiTi SMA wires were first joined with tungsten..., the amount of TiC compounds greatly decreases around the fusion boundary of the laser spot weld between the NiTi SMA and stainless steel. Mutual diffusion between NiTi shape memory alloy and stainless steel......
Trans. Nonferrous Met. Soc. China 23(2013) 781-787 Finite element simulation of ball spinning of NiTi shape memory alloy tube based on variable temperature field Shu-yong JIANG1, Yan-qiu ZHANG1, Ya..., Harbin 150001, China Received 28 December 2011; accepted 27 May 2012 Abstract: As a new attempt, ball spinning was used to manufacture the nickel-titanium shape memory alloy (NiTi SMA) tube......
Surface treatment of NiTi shape memory alloy by modified advanced oxidation process CHU Cheng-lin(储成林)1, WANG Ru-meng(王如萌)1, YIN Li-hong(尹立红)2, PU Yue-pu(浦跃朴)2, DONG Yin-sheng(董寅生)1... NiTi shape memory alloy(SMA). The microstructure and biomedical properties of the film were characterized by scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), inductively......
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