The effects of interstitials and hydrogen-interstitial interactions on low temperature hardening and embrittlement in V, Nb, and Ta
The effects of interstitials and hydrogen-interstitial interactions on low temperature hardening and embrittlement in V, Nb, and Ta
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间隙原子和氢间隙相互作用对 V、Nb 和 Ta 低温硬化和脆化的影响
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
T. Scott
中科院分区：
文献类型：
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作者：
W. Spitzig;C. Owen;T. Scott
在295 ~ 78 K温度范围内研究了C和H对V、Nb和Ta的屈服应力和塑性随温度变化的影响。由于C在这些金属中的溶解度有限，因此几乎没有固溶硬化（S.S.H.）。C和H的组合对延性的影响与H单独的影响相似。韧脆转变温度（DBTT）与晶界形成温度（Ts）之间没有相关性。对比未氢化和氢化V、Nb和Ta中C、N和O对强化的影响表明，一般来说，C、N或O和H的贡献是相加的。C、N和O产生非热S.S.H.而H对强化的贡献是热激活的。这些杂质对未氢化的V、Nb和Ta的延展性的影响很小，而它们对氢化的V、Nb和Ta的影响是降低Ts，但对DBTT的影响很小，DBTT主要由H含量决定。在不同合金中，DBTT和Ts之间或发生明显强化的温度和Ts之间没有共同的相关性。结果的比较表明，目前的模型的基础上，无论是氢化物沉淀或H在溶液中的原因，强化或脆化是无法解释的屈服应力和V，Nb，Ta的延展性上观察到的H的影响。
The effects of combined C and H on the temperature dependence of the yield stress and ductility of V, Nb, and Ta have been investigated at temperatures between 295 and 78 K. Because of the limited solubility of C in these metals, there was little solid solution hardening (S.S.H.). The combined effect of C and H on ductility was similar to that of H alone. There was no correlation between the ductile-brittle transition temperature (DBTT) and the temperature where hydrides formed (Ts. Comparison of the effects of C, N, and O on strengthening in both nonhydrogenated and hydrogenated V, Nb, and Ta showed that in general the contributions of C, N, or O and H were additive. C, N, and O produced athermal S.S.H. whereas the H contribution to the strengthening was thermally activated. The effect of these interstitials on ductility in nonhydrogenated V, Nb, and Ta was minimal, while their effect in hydrogenated V, Nb, and Ta was to decreaseTs but have very little effect on the DBTT, which was determined primarily by the H content. There was no common correlation between the DBTT andTs or between the temperature where pronounced strengthening occurred andTs in the different alloys. Comparison of the results indicated that current models based on either hydride precipitates or H in solution as the cause of strengthening or embrittlement are incapable of explaining the observed effects of H on both the yield stress and the ductility in V, Nb, and Ta.