精铸Ti-Al-Zr合金的显微组织和力学性能

来源期刊：中国有色金属学报2000年第z1期

论文作者：王惠光 陈玉勇 田竞 齐秀梅 贾均

文章页码：165 - 167

关键词：Ti-Al-Zr合金； 精密铸造； 显微组织

Key words：Ti-Al-Zr alloy； investment casting； microstructures

摘    要：用陶瓷型壳浇注了Ti-Al-Zr合金 ,研究了精铸Ti-Al-Zr合金的相组成、铸造显微组织、室温和高温力学性能及断口形貌。结果显示 ,精铸Ti-Al-Zr合金属于近α型 ,其铸态组织为网篮状魏氏组织 ,具有较好的室温和高温性能。Ti-Al-Zr合金的室温力学性能为 :抗拉强度1057.5MPa ,屈服强度 995MPa ,延伸率 18.45% ;500℃时的力学性能为 :抗拉强度 658.7MPa ,屈服强度 538.9MPa ,延伸率16.5%。该合金室温断口以延性断裂为主 ,伴有部分解理断裂 ,而高温拉伸断口为延性断裂。

Abstract: Ti-Al-Zr alloy was cast into a ceramic shell mould by investment technology. Microstructure phase constitution and mechanical properties at room temperature and elevated temperature and fracture morphology of Ti-Al-Zr alloy were studied. The microstructures of Ti-Al-Zr casting are basket weave configuration of Widmanst*]tten plates of α phase. The mechanical properties of Ti-Al-Zr alloy at room temperature are as follows: tensile strength 1 tten plates of α phase. The mechanical properties of Ti-Al-Zr alloy at room temperature are as follows: tensile strength 1 057.5 MPa, yield strength 995 MPa, elongation 18.45% and at 500 ℃: tensile strength 695 MPa, yield strength 539 MPa, elongation 16.5%. The fracture mechanism of Ti-Al-Zr alloy is dominated by ductile fracture delineated by small amounts of cleavage fracture at room temperature. The fracture mode at 500 ℃ is ductile fracture.