  The positron source is an essential component of the International Linear
Collider (ILC) and is an area that poses some design challenges. One
consideration is the material for the target, where the 1014 positrons per
second for the ILC are generated. The potential material would need to be able
to resist the high load created by the intense high energy photon beam. One of
such candidates is the titanium alloy Ti-6Al-4V, for which the results of
material tests with 3.5 MeV electrons are shown. The material was characterized
after the irradiation by high-energy X-ray diffraction (HE-XRD) and changes
caused by the irradiation to the crystal structure were studied. These tests
revealed there was only minimal change in the phase fractions and crystal
structure of the material under conditions as expected for the ILC.
