High strain-rate tensile properties of a TiAl alloy in duplex and fully lamellar microsturctural forms
来源期刊：中国有色金属学报(英文版)1999年第3期
论文作者：王瑜 林栋梁 Young- Won Kim
文章页码：437 - 441
Key words：titanium aluminide; tensile property; high strain rate
Abstract: A self-designed Split-Hopkinson tensile bar setup with a rotating disk was used to investigate roomtemperature tensile properties of aγ-TiAl alloy in duplex (DP) and fully lamellar (FL) microstructural forms under the dynamic strain rates between 70 and 800s-1. It was found that for both forms the alloy is brittle at these strain rates, exhibiting near-zero ductility. The σb at dynamic strain rate is greater than that at the static strain rate of 5×10-1s-1, and the σb of the DP material is higher than that of the FL material. Fractography analysis indicated that both materials at dynamic strain rates fracture in a mixed mode of predominant transgranular cleavage and minor intergranular cracking, which is similar to that at the static strain rate. The roomtemperature brittleness of the alloy is not environmentally related.
