Elasticity of Mo‐Re and W‐Re alloys under hydrostatic pressure

摘要

The elastic moduli of single crystals of Mo‐16%Re, Mo‐29% Re, and W‐11% Re have been measured to 0.5 GPa (5 kbar) hydrostatic pressure at room temperature. The composition dependence of the pressure derivatives of the moduli follows the trends established for Nb‐Mo and Ta‐W alloys. This finding was unexpected since the shear modulus, C′ = (C11-C12)/2 has a sharp peak in its composition dependence at e/a = 6.0. The results are explained in terms of the differing effects of compression on different d‐electron subbands. Because dC′/dP decreases with increasing Re content, it is also suggested that the compositional range for stability of the bcc structure decreases with increasing pressure.