Effect of minor boron addition on mechanical properties of
wrought TiAl alloy①
wrought TiAl alloy①
(1. School of Materials Science and Engineering, ShanghaiJiao Tong University,
Shanghai200030, P.R.China;
2. Materials and Mechanics Engineering, United Technologies-Pratt and Whitney,
East Hartford, Connecticut, 06108, U.S.A.)
Shanghai200030, P.R.China;
2. Materials and Mechanics Engineering, United Technologies-Pratt and Whitney,
East Hartford, Connecticut, 06108, U.S.A.)
Abstract: The effect of minor boron(1.0%, mole fraction) addition on tensile properties of wrought Ti-47-2Mn-2Nb alloy was investigated within the temperature range from 77K to 1373K and the strain rate range from 10-5s-1to 10-1s-1. It was found that the minor addition of boron effectively refines the nearly lamellar microstructure of the alloy, significantly improves its strength, as well as its ductility. Although to a less degree, below its brittle-to-ductile transition temperature (TBD), it does not harm its strength above itsTBD, and is therefore proved to be an potentially effective way to improve comprehensive properties of wrought TiAl alloy. The B addition was also found to produce no obvious change in the fracture mode except for the cases aroundTBD.
Key words: titanium aluminide; intermetallics; boron