Thermal stability of helium bubble superlattice in Mo under TEM in-situ heating

JOURNAL OF NUCLEAR MATERIALS

卷:505

Article

Gan, Jian¹  Sun, Cheng¹  He, Lingfeng¹  Zhang, Yongfeng²  Jiang, Chao²  Gao, Yipeng² 

[1] Characterizat & Adv PIE Div, Idaho Falls, ID USA

[2] Idaho Natl Lab, Nucl Sci & Technol Div, POB 1625, Idaho Falls, ID 83415 USA

关键词: Helium;    Ion irradiation;    Gas bubble superlattice;    Transmission electron microscopy;    In-situ heating;   

DOI  :  10.1016/j.jnucmat.2018.04.030

来源: Elsevier

【 摘 要 】

Although the temperature window of helium ion irradiation for gas bubble superlattice (GBS) formation was found to be in the range of approximately 0.15-0.35 melting point in literature, the thermal stability of He GBS has not been fully investigated. This work reports the experiment using an in-situ heating holder in a transmission electron microscope (TEM). A 3.0 mm TEM disc sample of Mo (99.95% pure) was irradiated with 40 keV He ions at 300 degrees C to a fluence of 1.0E+17 ions/cm(2), corresponding to a peak He concentration of approximately 10 at.%, in order to introduce He GBS. In-situ heating was conducted with a ramp rate of similar to 25 degrees C/min, hold time of similar to 30 min, and temperature step of similar to 100 degrees C up to 850 degrees C (0.39T(m) homologous temperature). The result shows good thermal stability of He GBS in Mo with no noticeable change on GBS lattice constant and ordering. The implication of this unique and stable ordered microstructure on mechanistic understanding of GBS and its advanced application are discussed. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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