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首页> 外文会议>20th International Symposium on Effects of Radiation on Materials, Jun 6-8, 2000, Williamsburg, Virginia >Irradiation-Induced Amorphization and Its Recovery Behavior in Cold-Rolled and Aged Ti-Ni Shape Memory Alloys
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Irradiation-Induced Amorphization and Its Recovery Behavior in Cold-Rolled and Aged Ti-Ni Shape Memory Alloys

机译：冷轧和时效Ti-Ni形状记忆合金中的辐照诱导非晶化及其恢复行为

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摘要

The materials used were Ti-50.0, 50.5 and 51.0at%Ni alloys which were cold rolled and aged at 400℃ for 1 hr. Neutron irradiation was performed in the Japan Materials Test Reactor (JMTR) up to a dose of 1.2 X 10~(24)n/m~2 at cooling water temperature (about 60℃), which meant the specimens were irradiated in the parent phase (B2). After the irradiation, micro-Vickers hardness measurements, microstructure observations by transmission electron microscope (TEM) and positron annihilation spectrometry (PAS) measurements were carried out. Differential scanning calorimetry (DSC) measurements were taken at temperatures between -120℃ and 120℃. After the irradiation, all the alloys show extremely high irradiation hardening: the estimated increase in the yield stress of Ti-50Ni alloy is almost 1GPa. Although the hardness of the Ti-Ni alloys depends on the alloy composition in the unirradiated condition, all the alloys reach the same hardness value after the irradiation. DSC measurements revealed that the martensitic transformation was completely suppressed by the irradiation in all the alloys. PAS study revealed that no structural vacancies existed in the alloys before the irradiation, and that vacancies were formed after the irradiation. Microstructural observations indicate that disordered regions, which were considered to be amorphous, were homogeneously distributed in the irradiated parent ordered phase, accompanied by an appearance of the halo ring on the diffraction pattern. The irradiation effects disappeared following a post-irradiation anneal at 250℃ for 1 hr. The recovery of the martensitic transformation by post-irradiation annealing is attributed to the migration of vacancies that causes the reordering. It is expected that Ti-Ni alloys are potential self-restorative materials for the irradiation above 250℃ where vacancies are mobile.
机译：所用材料为Ti-50.0、50.5和51.0at％Ni合金，将其冷轧并在400℃时效1小时。在冷却水温度（约60℃）下，在日本材料试验反应堆（JMTR）中进行中子辐照，辐照剂量最高为1.2 X 10〜（24）n / m〜2，这意味着样品在母相中辐照（B2）。照射后，进行维氏硬度测定，透射电子显微镜（TEM）的显微组织观察和正电子an没光谱法（PAS）的测定。差示扫描量热法（DSC）的测量是在-120℃至120℃之间进行的。辐照后，所有合金均表现出极高的辐照硬化：估计Ti-50Ni合金的屈服应力增加将近1GPa。尽管Ti-Ni合金的硬度取决于未辐照条件下的合金成分，但是所有合金在辐照后都达到相同的硬度值。 DSC测量表明，所有合金的辐照都完全抑制了马氏体转变。 PAS研究表明，辐照前合金中不存在结构空位，而辐照后形成空位。微观结构观察表明，被认为是无定形的无序区域均匀地分布在受辐照的母体有序相中，并伴随着衍射图上出现的晕环。在250℃下进行1小时的辐射后退火后，辐射效果消失了。通过辐照后退火恢复的马氏体相变归因于空位的迁移，该空位的迁移导致了重排。预期Ti-Ni合金是空位可移动的250℃以上辐射的潜在自修复材料。

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