Effect of yttrium on dynamic strain aging of vanadium alloys
Effect of yttrium on dynamic strain aging of vanadium alloys
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DOI：
10.1016/j.jnucmat.2013.03.091
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发表时间：
2013-11
影响因子：
3.1
通讯作者：
T. Miyazawa;T. Nagasaka;Y. Hishinuma;T. Muroga;Yanfen Li;Y. Satoh;Sawoong Kim;H. Abe
中科院分区：
文献类型：
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作者：
T. Miyazawa;T. Nagasaka;Y. Hishinuma;T. Muroga;Yanfen Li;Y. Satoh;Sawoong Kim;H. Abe
为了提高熔合堆用钒合金的性能，在基体中加入钇(Y)，通过Y的强化析出来减少基体中的间隙O。然而，Y对间隙C、N和O的影响仍有待研究，因为它们会通过钉住位错（如动态应变时效（DSA））影响钒合金的力学和断裂性能。本研究对473 ~ 1073 K的V-4Cr-4Ti和V-4Cr-4Ti - y合金进行了应变率为6.67 × 10−5 ~ 6.67 × 10−1s−1的拉伸试验，研究了DSA的性能。在高纯度合金中，由于Y的加入和O含量的降低，DSA区缩小。对于O掺杂的V-4Cr-4Ti合金，DSA区也被缩小。这可能是因为增强的Ti-O析出降低了基体中的O水平。在O掺杂的V-4Cr-4Ti-Y合金中还观察到<500 nm的粗相。Y可以促进ti析出相的粗化。从DSA的活化能来看，可以认为C和O的扩散引起了所观察到的DSA。Y不影响C和O的扩散，并可能促进成核形成粗相。
In order to improve the performance of vanadium alloys for fusion reactors, yttrium (Y) was added to reduce the interstitial O in the matrix by enhanced precipitation with Y. Effect of Y on interstitial C, N and O, however, remains to be investigated since they affect mechanical and fracture properties for vanadium alloys by pinning dislocations, such as dynamic strain aging (DSA). In this study, tensile tests were carried out on annealed V–4Cr–4Ti and V–4Cr–4Ti–Y alloys from 473 to 1073 K at strain rates ranging from 6.67 × 10−5to 6.67 × 10−1s−1to investigate the performance of DSA. In the case of high-purity alloys, DSA regime was narrowed due to Y addition and the reduction in O content. In the case of O doped V–4Cr–4Ti alloys, DSA regime was also narrowed. This may be because the enhanced Ti–O precipitation reduced the O level in the matrix. Also, coarse precipitates (<500 nm) were observed in O doped V–4Cr–4Ti–Y alloy. Y might enhance the coarsening of Ti-precipitates. From activation energies for DSA, the diffusion of C and O is considered to induce the observed DSA. Y does not influence the diffusion of C and O, and might enhance the nucleation to form coarse precipitates.