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定向凝固Ti-(44%-54%)Al合金的凝固相选择李新中1,孙涛2,于彩霞1,苏彦庆1,曹勇智2,郭景杰0,傅恒志2(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.哈尔滨工业大学 机电工程学院)摘 要:通过对Ti-(44%-54%)Al合金(原子分数)在较大的温度梯度与生长速率比值(G/v)范围内进行Bridgman定向凝固实验,研究了不同凝固条件下的固/液界面形态演化规律,包晶两相组织的形成规律及最终形成的片层结构的取向规律.采用充分形核假设及成分过冷判据,计算了不同成分Ti-Al合金相与组织随凝......
solidification path, has no effect on the room temperature phase composition of high-Nb TiAl alloy. With the increase of W content, the segregation degree of Nb and Al element is enhanced... and Engineering A, 1994, 184: L11. [7] MAZISAZ P J, RAMANUJAN R V, LIU C T. Effects of B and W alloying additions on the formation and stability of lamellar structures in two-phase γ-TiAl[J]. Intermetallics......
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been highly desirable to introduce the B2 phases in TiAl intermetallics. Ti-45Al-xFe-yFe alloy is a near γ-TiAl alloy. An important phase transformation in this alloy is the phase transformation from...:citation> pointed out that fine-grained cast TiAl alloys can be produced by utilizing the refining effect of β solidification. Obviously, the microstructural scale of these β-containing TiAl alloys......
, 2004, 153-154(1): 42-47. [17] Johnson D R, Inui H, Muto S, Omiya Y, Yamanaka T. Microstructural development during directional solidification of α-seeded TiAl alloys [J]. Acta Materialia, 2006, 54(4... process of difficult-to-form TiAl sheets, twin-roll strip casting and microstructural control were investigated in Ti-43Al alloy. A crack-free sheet with dimensions of 1000 mm × 110 mm × 2 mm......
1.81 W/(m·K)) and showed anisotropic property with respect to the pore orientation. References [1] WU Xin-hua. Review of alloy and process development of TiAl alloys [J]. Intermetallics, 2006, 14...Trans. Nonferrous Met. Soc. China 30(2020) 382-391 Microstructures and properties of porous TiAl-based intermetallics prepared by freeze-casting Zhong-liang LU1,2,3, Wen-liang XU1, Ji-wei CAO1, Yuan......
, can describe the major phenomena that control the solidification processes, and has become powerful tools in studying the microstructural formation and evolution involving nucleation and growth...Article ID: 1003-6326(2005)02-0291-05 Modeling of solidification grain structure for Ti-45%Al alloy ingot by cellular automaton WU Shi-ping(吴士平), LIU Dong-rong(刘东戎), GUO Jing-jie(郭景杰), FU......
) microstructures. Results show that, under dynamic loading, the high temperature strength of the PM TiAl intermetallics is higher than that under quasi-static loading, and the ductile to brittle... of the PM TiAl intermetallics are nearly insensitive to strain rate and temperature at high strain rates (800-l600 s-1) and high temperatures (650-850 °C). Zerilli-Armstrong model is successfully used......
和硫化物组成,形成的混合膜黏附性差,较易剥落. 关键词:TiAl金属间化合物;高温热腐蚀;烙融硫酸盐 中图分类号:TG 146.2; TG 172.6 文献标识码:A Effect of microstructure on hot corrosion behavior of TiAI intermetallics JIN Guang-xil, QIAO... behavior of as-cast and homogenized TiAl intermetallics w as studied in ( Na, K) S04 mixed melts at 900 0C, and the mechanism of the hot corrosion was discussed. The results show......