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Ti and Cr beryllides are materials of potential importance as neutronmultipliers for tritium breeding in nuclear fusion reactors. The n-to-2ntransmutation reaction also produces tritium and helium, which form bubbles.Neutron irradiation from fusion plasma also introduces point defects. Theeffect on beryllides' microstructure is important for understanding theirmechanical properties and evolution in the fusion reactor environment. Thisstudy determines and describes the microstructural features that occur inTiBe12 and CrBe12 when He and fast-particle-induced point defects areintroduced at fusion reactor neutron breeder relevant temperatures. Beryllidesamples were implanted with 300kV He at temperatures between$387-900^{\circ}C$, sectioned down through the implantation surface with afocused ion beam post-irradiation, and the resulting microstructures examinedusing transmission electron microscopy, electron-dispersive spectroscopy (EDS)and precession diffraction mapping. Nanometre bubbles grew in both TiBe12 andCrBe12 at $600^{\circ}C$; larger (100 nm and over) bubbles, some faceted, grewat $900^{\circ}C$. Some bubbles in CrBe12 were lined with Cr, some oxidised.TiBe12 developed planar faults, on $\{110\}$ planes at $600^{\circ}C$ and belowbut on $\{111\}$ at $900^{\circ}C$. Faults were preferentially associated withlarge bubbles. The displacement vectors of faults on the $\{110\}$ planes hadsome commonality with previous studies that found displacement vectors offamilies $R=\langle 011\rangle$ and $R= \langle 110\rangle$; the present studyalso found faults that matched neither previously found type. CrBe12 alsodeveloped planar faults with an appearance quite different from the typicalstriped appearance of planar stacking faults; their nature remains unknown.Oxide particles were found in both beryllides, most prominently in CrBe12.

Irradiation of TiBe12 and CrBe12 with He+ ions and ex-situ transmission  electron microscopy to investigate ion damage as a proxy for neutron  irradiation damage in nuclear fusion