Effects of dehydrogenation heat-treatment on electrical-mechanical properties for hydrogenated Cu-3 mass%Ti alloys
Effects of dehydrogenation heat-treatment on electrical-mechanical properties for hydrogenated Cu-3 mass%Ti alloys
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DOI：
10.1016/j.jallcom.2013.02.121
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发表时间：
2013-07
影响因子：
6.2
通讯作者：
A. Kamegawa;T. Kuriiwa;M. Okada
中科院分区：
文献类型：
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作者：
A. Kamegawa;T. Kuriiwa;M. Okada
在我们以前的研究中，我们报道了氢化的Cu-3质量%Ti合金的机械强度和电导率同时得到了显著的提高。在350℃、氢气压力7.5 Mpa、48h的条件下进行氢热处理，分解为富铜相和钛氢化物。本文主要研究了氢化铜钛合金的脱氢热处理工艺。在TDS测量中，观察到氢化后的Cu3质量%Ti合金在250℃和550℃有两种放氢峰。较低的峰可能是由位错等缺陷捕获的氢的脱附造成的。较高的温度峰对应于分解的氢化钛。结果表明，脱氢温度高于400℃时，合金的抗拉强度下降。在S-S曲线上观察到脱氢温度高于350℃时合金的塑性变形，然后合金的屈服应变急剧增加。通过350~375℃的最佳脱氢处理，可同时获得较高的拉应力和塑性。
In our previous study, we reported that remarkable simultaneous improvements of mechanical strength and electrical conductivity are achieved in the hydrogenated Cu–3mass%Ti alloy. The hydrogen heat-treatment at 350°C under hydrogen pressure of 7.5MPa for 48h proceeds with the decomposition to Cu-rich phase and Ti-hydride. The present investigation focused on dehydrogenation heat-treatment for the hydrogenated Cu–Ti alloys. Two kinds of hydrogen desorption peaks of the hydrogenated Cu–3mass%Ti alloy at 250°C and 550°C were observed in the TDS measurement. The lower peak would be caused by desorption of hydrogen trapped by the defects such as dislocations. The higher temperature peak would be corresponded to the decomposition Ti hydride. In consequence, the tensile strength of the hydrogenated alloy decreased with increasing dehydrogenation temperature more than 400°C. The plastic deformations of the alloys with dehydrogenation at more than 350°C were observed in the S–S curves, and then the yield strains of the alloys drastically increased. High tensile stress and ductility were simultaneously obtained by optimum dehydrogenation treatment at 350–375°C.