Why substitution of Ta for Al sites in gamma prime lattice (which contains W) reduces the gamma prime lattice parameter?

08 July 2017 0 6K Report

atomic radius of Ta is 1.70 and atomic radius of W is 1.62 angstrom. Why substitution of Ta for Al sites in gamma prime lattice (which contains W) reduces the gamma prime lattice parameter?

http://www.sciencedirect.com/science/article/pii/S1359645414002328?via%3Dihub

http://www.sciencedirect.com/science/article/pii/S1359645410004283?via%3Dihub

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