摘要
本研究用三点弯曲实验测定了铝含量为43at·％～56at·％的Ti-Al二元合金的力学性能;利用光学显微镜、X射线衍射仪和透射电子显微镜研究了不同成分合金的微观组织和变形亚结构。实验结果表明:根据不同成分合金的微观组织可将其分成三类,即:γ-TiAl单相组织(52at·％～56at·％Al);双态组织(46at·％～50at·％Al)和全片层结构晶粒组织(43at·％～46at·％Al),其中以具有细晶双态组织的合金具有较好的塑性变形能力。本文从微观组织结构和变形位错组态的变化,探讨了合金成分对TiAl基有序合金塑性变形的影响机制。
The mechanical properties of binary TiAl-base alloys with Al contents from43at% to 56 at.% were measured with bending test. Their microstructures anddeformation substructures were studied by means of optical microscope, X-raydiffractometer and transmission electron microscope. It was found that thealloys could be classified into three groups according to their microstructuralcharacteristics, i.c., γ-TiAl single phase structure (52at·%～56at·%Al), duplexstructure(46at·%～50at. %Al)and full lamellar structure(43at·%～46at·%). Amongthese three groups of alloys, only the alloys with fine duplex structure showappreciable plastic strains. In this paper, the compositional effect on the plasticdeformation of TiAl-base ordered alloys were discussed in view of the changesin microstructures and deformation dislocation configurations with composition.
基金
国家863高科技计划
国家教委优秀年轻教师基金
关键词
钛合金
铝合金
显微组织
变形
影响
titanium compounds
intermetallic compounds
microstructures
dislocations
ductility/aluminides
ordered alloys
