lasernigel,
Let's get the terminology correct. This thread isn't about fan blades, it is about an intermediate turbine blade that is apparently problem on the Trent 1000 as experienced by ANA.
Fan blades are in the very front of the engine and run cool. Turbine blades are towards the rear of the engine, aft of the combustor and run hot. Fan blades, some early stages of the compressor (low pressure) and some discs in the fan or early stages of the compressor may very well be made of titanium. In the turbine, there are no titanium blades, vanes or turbine discs because of the high temperatures being experienced. There may be titanium aluminide turbine blades in the very last stage of a five or six stage low pressure turbine of certain engines dependent on temperatures being experienced, but that is only because titanium aluminide has somewhat improved high temperature capability verses common titanium alloys.
Main fan blades are not intermediate turbine blades.