△X A Elastic modulus For the cubic phase, For the hexagonal phase, apply the tri-axial shear strain e △E 3 △E C462 e=(0,0,0,8,8,0) (0,0,0,6,6,6)to getC44 =C4462 2 apply the volume-conserving △E e=(6,8,0,0,0,0) (C1+C12)82 = orthorhombic strain e=(δ， △E =6C82+0(83) 8,(1+8)-2-1,0,0,0)to △E e=(0,0,0,0,0,8) =4(C1-C12)82 getC'=(C11-C12)/2 △E apply the strain under hydrostatic △E 9 e=(0,0,8,0,0,0) pressure e=(8,6,8,o,o,o)to B82 2 get B △E 9 e=(⑥，8,8,0,0,0) B82 3B+4C C1= 3 B=2/9(C1+C12+2C13+C33/2) 3B-2C C12二 3Elastic modulus G apply the tri-axial shear strain e = (0, 0, 0, δ, δ, δ) to get C44 For the cubic phase, apply the volume-conserving orthorhombic strain e = (δ, δ, (1 + δ)−2−1, 0, 0, 0) to get C’ = (C11-C12)/2 apply the strain under hydrostatic pressure e = (δ, δ, δ, 0, 0, 0) to get B For the hexagonal phase, e = (δ, δ, 0, 0, 0, 0) e = (0, 0, 0, 0, 0, δ) e = (0, 0, δ, 0, 0, 0) e = (0, 0, 0, δ, δ, 0) e = (δ, δ, δ, 0, 0, 0) B = 2/9(C11 + C12 + 2C13 + C33/2)