SIMS analysis of low content hydrogen in commercially pure titanium
SIMS analysis of low content hydrogen in commercially pure titanium
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工业纯钛中低含量氢的 SIMS 分析
DOI：
10.1007/s10853-009-3783-2
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发表时间：
2009
影响因子：
4.5
通讯作者：
H. Noguchi
中科院分区：
文献类型：
--
作者：
S. Hamada;K. Ohnishi;Hideaki Nishikawa;Y. Oda;H. Noguchi
钛及钛合金由于其优异的比强度和耐环境性能，被广泛用作结构件。然而，钛是非常活跃的，使得在制造期间不仅氧和氮，而且氢可以容易地引入到材料中。钛通常含有特定量的氢，并且取决于氢含量，它作为氢化物或固溶体存在于钛中。纯钛（α相钛）的氢固溶度极限似乎高于10 ppm [1]，尽管报告了一些值。也就是说，如果纯钛的氢含量小于10 ppm，则所有的氢被认为是钛中的固溶体。另一方面，当氢含量超过固溶度极限时，会出现结晶。由于氢化物是脆性的，它削弱了钛的强度。因此，商业纯钛（CP-Ti）中的氢含量在150 ppm以内[2]。本文作者使用除氢样品（氢含量为2.7 ppm）和正常样品（34 ppm）对钛样品进行了疲劳强度评价[3，4]。在2.7ppm的表面上，氢化物不存在，而在34 ppm的表面上，氢化物存在。发现34 ppm的疲劳裂纹形核寿命大于2.7ppm的疲劳裂纹形核寿命，而34 ppm的疲劳裂纹扩展寿命与2.7ppm的疲劳裂纹扩展寿命相同。裂纹扩展的具体观察结果表明，晶界附近的材料行为对裂纹扩展很重要[3，4]。因此，了解晶界附近氢的实际状态对于CP-Ti的应用是非常重要的。目前有多种方法检测材料中的氢，每种方法都有其优缺点。氢热脱附分析法（TDS和TDA）可用于平均氢含量和能态分析[5]。如前所述，CP-Ti中的氢以固溶体或氢化物的形式存在，应评估晶界周围局部化的氢。然后可以通过以下方法可视化局部氢。
Due to their excellent specific strength and environmental resistance, titanium and its alloys have been widely used as structural components. However, titanium is very active, so that not only oxygen and nitrogen, but also hydrogen may be readily introduced into the material during manufacturing. Titanium usually contains a specific amount of hydrogen, and it exists in the titanium as a hydride or solid solution dependent on the hydrogen content. The hydrogen solid solubility limit of pure titanium (a-phase titanium) seems to be higher than 10 ppm [1], although some values are reported. That is to say, if the hydrogen content of pure titanium is less than 10 ppm, all the hydrogen is thought to be a solid solution in the titanium. On the other hand, when the hydrogen content is more than the solid solubility limit, hydrides would appear. As the hydride is brittle, it weakens the strength of the titanium. Therefore, the hydrogen content in commercially pure titanium (CP-Ti) is within 150 ppm [2]. The present authors carried out a fatigue strength evaluation of titanium samples using the hydrogen removed sample (hydrogen content is 2.7 ppm) and normal sample (34 ppm)[3, 4]. On the surface of the 2.7 ppm one, the hydride did not exist, while on the 34 ppm one, the hydride was present. It was found that the fatigue crack nucleation life of the 34 ppm one is greater than that of the 2.7 ppm one, and the fatigue crack propagation life of the 34 ppm one is the same as the 2.7 ppm one. This specific observation of the crack propagation indicated that the material behavior near the grain boundary is important for the crack propagation [3, 4]. It is then important to understand the actual state of hydrogen near the grain boundary for the CP-Ti applications.There are some methods to detect hydrogen in materials, and each method has some merits and demerits. The hydrogen thermal desorption analysis method (TDS and TDA) can be used for the average hydrogen content and energy state analysis [5]. As already mentioned, hydrogen in the CP-Ti exists as a solid solution or hydride, and the hydrogen localized around the grain boundary should be evaluated. The localized hydrogen can then be visualized by the following method.
通过二次离子质谱法可视化铁素体、珠光体和石墨的氢解吸过程
DOI：
--
发表时间：
2002
期刊：
Metallurgical and Materials Transactions A Vol.33A
影响因子：
--
作者：
K.Takai;Y.Chiba;K.Noguchi;A.Nozue
通讯作者：
A.Nozue