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Bend Stress Relaxation of Pure Tungsten

机译：纯钨弯曲应力松弛

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Tungsten is one of the candidate materials being considered for fabricating the plasma facing components (PFCs) of fusion reactors. When used in fusion reactors, PFCs are exposed to high heat loads from the fusion plasma, resulting in the PFCs being subjected to induced thermal stresses. This study focused on the creep deformation of pure tungsten under such a deformation-controlled thermal stress. Bend stress relaxation (BSR) tests were performed on specimens of as-received pure tungsten at temperatures of 600 - 1000?C for 0.1 - 1 h in vacuum. The BSR ratio decreased with an increase in the temperature, decreasing sharply in a short period of 0.1 h and then decreasing gradually. Most of the stress was relieved during the BSR test performed at 1000?C for 1 h. The activation energy of stress relaxation, calculated using the cross-cut method, was similar to that of the Peierls mechanism. This suggested that the mobility of the dislocations controls the stress relaxation mechanism. Most of the stress was relieved quickly because the activation energy of stress relaxation was relatively small.
机译：钨是被考虑用于制造聚变反应堆的面向等离子体部件（PFC）的候选材料之一。当在聚变反应堆中使用时，PFC会受到聚变等离子体的高热负荷，导致PFC承受感应的热应力。这项研究集中在纯钨在这种变形控制的热应力下的蠕变变形。在真空下，在600-1000 ？s的温度下对原样的纯钨样品进行弯曲应力松弛（BSR）测试0.1-1 h。 BSR比随着温度的升高而降低，在0.1 h的短时间内急剧降低，然后逐渐降低。在1000 ？ C下进行1小时的BSR测试期间，大部分应力得以缓解。使用横切法计算的应力松弛的活化能与Peierls机制相似。这表明位错的迁移率控制了应力松弛机制。由于应力松弛的激活能量相对较小，因此大部分应力得以快速缓解。

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