微量硼和应变速率对变形TiAl合金室温力学性能的影响

来源期刊：中国有色金属学报1999年第1期

论文作者：王瑜 林栋梁 Chi C Law

文章页码：1 - 7

关键词：金属间化合物，TiAl合金，拉伸性能，应变速率，硼

Key words：intermetallics, titanium aluminide, tensile properties, strain rate, boron

摘    要：以形变Ti-47Al-2Mn-2Nb合金为对象， 研究了微量硼合金化和应变速率对TiAl合金室温力学性能的影响。发现添加微量(1.0%，摩尔分数)硼就能有效地细化形变Ti-47Al-2Mn-2Nb合金的近全片层组织，显著提高其室温强度， 并在一定程度上改善室温塑性； 变形TiAl合金不论添硼与否， 其室温强度均随应变速率的升高而升高，而延伸率对应变速率不太敏感；微量硼合金化和应变速率对变形TiAl合金室温断裂方式无明显影响。

Abstract: Wrought Ti-47Al-2Mn-2Nb alloy was chosen to investigate the effects of trace (1.0%, mole fraction) boron addition and the strain rate on tensile properties of TiAl alloy at room temperature. It was found that the addition of boron effectively refines grains in the alloy, increases its strength and improves its ductility; on the other hand, the strengths of the two alloys, doped or undoped with boron, increase with the strain rate while tensile ductility is not so much sensitive to the strain rate as the strength; moreover, neither microalloying with boron nor a change in the strain rate from 10-5 to 10-1 s-1 produces an obvious change in fractography at room temperature.