Comparison of a Directionally Solidified TiAl Alloy by Φ15 mm Cylindrical and 29 x 6 mm Plate Y2O3 Molds

作者：Zhang, Hailong; Ding, Hongsheng^*; Wang, Qiang; Chen, Ruirun; Guo, Jingjie; Fu, Hengzhi

来源：JOM, 2017, 69(10): 1812-1817.

DOI：10.1007/s11837-017-2475-7

• MECHANICAL-PROPERTIES
• TENSILE PROPERTIES
• TI-46AL-8NB ALLOY
• CASTING PROCESS
• PST CRYSTALS
• GROWTH-RATE
• MICROSTRUCTURE
• CRUCIBLES
• SINGLE

To begin a preliminary exploration on the effect of shape, the effect of a novel shaped 29 x 6 mm plate mold on the microstructure and mechanical properties of directionally solidified (DS) Ti-45Al-2Cr-2Nb was investigated. For comparison, Phi 15 mm cylindrical molds with an equivalent cross-sectional area were used. Experimental results show that the typical microstructures of the DS region in all samples consist of regular well aligned alpha(2)/gamma lamellar structure, B2 phase and Y2O3 particles. Due to the lower strength of flow generated by the shape factor of the mold, the plate sample has coarser lamellae and more B2 phase, but fewer Y2O3 particles. Additionally, the room temperature (RT) fracture toughness and tensile properties of the plate sample are improved.

• 出版日期2017-10
• 单位哈尔滨工业大学