Here is some interesting write-up on Y-20's building material.

Y-20 cabin breaks up material monopoly(Source: People's Daily Online)   2013-02-08(Y-20 File Photo)　　On Jan. 26, China successfully completed the maiden flight of Y-20, a heavy military freighter independently developed by China. The success of Y-20’s first test flight marks that China has become the fourth country to be able to make 200-ton scale military air freighter.　　It is reported that