Fig. 1. Cross-section micrographs of samples treated at gas mixture of: (a) 0.25%; (b) 0.50%; (c) 0.75%; and (d) 1.00% CH4 in 80% H2+20% Ar. Samples treated at 723 K, for 4 h, gas mixture flow rate of 1.67×10−6 Nm3 s−1 and pressure of 400 Pa.
Fig. 1. Cross-section micrographs of samples treated at gas mixture of: (a) 0.25%; (b) 0.50%; (c) 0.75%; and (d) 1.00% CH4 in 80% H2+20% Ar. Samples treated at 723 K, for 4 h, gasmixture flow rate of 1.67×10−6 Nm3 s−1 and pressure of 400 Pa.