Effect of minor boron addition on mechanical properties of wrought TiAl alloy

来源期刊：中国有色金属学报(英文版)2000年第2期

论文作者：王瑜 林栋梁 Chi C.LA W

文章页码：162 - 166

Key words：titanium aluminide; intermetallics; boron

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^-5 s^-1 to 10^-1 s^-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 (T_BD), it does not harm its strength above its T_BD, 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 around T_BD.