Just rummaging around with google finds mention of "7075 Al alloy M15 crank bolts" with the Ti version and M14 steel bolts with the non Ti version so sounds like there are.
If you do have alloy crank bolts, don't use them to install and initially torque the crank arms. Use steel bolts first and, after the crank has been properly installed, you can substitute the alloy bolts. For that matter, if you do have alloy crank bolts, buy steel ones and use them and use the alloy bolts as decorators.