Anisotropic swelling and microcracking of neutron irradiated Ti3AlC2-Ti5Al2C3 materials

SCRIPTA MATERIALIA

卷:114

Article

Ang, Caen¹  Silva, Chinthaka¹  Shih, Chunghao¹  Koyanagi, Takaaki¹  Katoh, Yutai¹  Zinkle, Steven J.^1,2 

[1] Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Knoxville, TN USA

关键词: Anisotropic swelling;    Neutron irradiation;    MAX phase;    Microcracking;    Lattice parameter;   

DOI  :  10.1016/j.scriptamat.2015.11.008

来源: Elsevier

【 摘 要 】

M(n + 1)AX(n). (MAX) phase materials based on Ti-Al-C have been irradiated at 400 degrees C (673 K) with fission neutrons to a fluence of 2 x 10(25) n/m(2) (E > 0.1 MeV), corresponding to similar to 2 displacements per atom (dpa). We report preliminary results of microcracking in the Al-containing MAX phase, which contained the phases Ti3AlC2 and Ti5Al2C3. Equibiaxial ring-on-ring tests of irradiated coupons showed that samples retained 10% of pre-irradiated strength. Volumetric swelling of up to 4% was observed. Phase analysis and microscopy suggest that anisotropic lattice parameter swelling caused microcracking. Variants of titanium aluminum carbide may be unsuitable materials for irradiation at light water reactor-relevant temperatures. (C) 2015 Elsevier Ltd. All rights reserved.

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