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首页> 外文会议>2001 TMS Annual Meeting on Structural Biomaterials for the 21st Century, Feb 11-12, 2001, New Orleans, LA >HYDROGEN EMBRITTLEMENT OF Ni-Ti ALLOY IN BIOLOGICAL ENVIRONMENT
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HYDROGEN EMBRITTLEMENT OF Ni-Ti ALLOY IN BIOLOGICAL ENVIRONMENT

机译：Ni-Ti合金在生物环境中的氢脆化

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摘要

It is known that Ni-Ti superelastic alloy is susceptible to environmental embrittlement in a corrosive atmosphere. Diffusion rate of hydrogen is thought to be one of the factors in deciding a service life. Accelerating test of hydrogen embrittlement was carried out, i.e., the alloys with a diameter of 0.56 mm were charged with hydrogen using an electrochemical system. The alloys with charging of 1 A/m~2 or 10 A/m~2 for 24 h or 120 h, respectively, were tested. Hardness numbers on cross-sectional area were measured. Distributions of hydrogen concentration were computed for infinite cylinder model by differential equation. If the hardness is linear to the concentration of hydride and/or hydrogen, diffusion constant of hydrogen through the Ni-Ti alloy could be estimated 9 x 10~(-15) m~2/s. Experimental results of the hardness and fractography support the estimated diffusion constant. Hydrogen embrittlement and fretting corrosion were discussed with the hydrogen intake.
机译：已知Ni-Ti超弹性合金在腐蚀性气氛中易受环境脆化的影响。氢的扩散速率被认为是决定使用寿命的因素之一。进行氢脆化的加速试验，即，使用电化学系统向直径为0.56mm的合金充氢。测试了分别在24小时或120小时充电1 A / m〜2或10 A / m〜2的合金。测量横截面积上的硬度值。通过微分方程计算了无限圆柱模型的氢浓度分布。如果硬度与氢化物和/或氢的浓度成线性关系，则氢在Ni-Ti合金中的扩散常数估计为9 x 10〜（-15）m〜2 / s。硬度和断裂的实验结果支持估计的扩散常数。讨论了氢的脆化和微动腐蚀。

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