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α凝固TiAl合金显微组织细化
Microstructural Refinement of α Solidified TiAl Alloy
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- DOI:
- 作者:
- 高文强 1，2 ，刘 川 1，2，3 ，楚玉东 1，2 ，谭 超 4
GAO Wenqiang1,2, LIU Chuan1,2,3, CHU Yudong1,2, TAN Chao4
- 作者单位:
- 1. 西北工业大学重庆科创中心，重庆 401135；2. 重庆三航新材料技术研究院有限公司，重庆 401135；3. 西北工业大学 航空学院，陕西 西安 710072；4. 西北工业大学 材料学院，陕西 西安 710072
1. Innovation Center NPU Chongqing, Chongqing 401135, China; 2. Sanhang Advanced Materials Research Institute Co., Ltd., Chongqing 401135, China; 3. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China; 4. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- TiAl 合金；片层组织；循环热处理；晶粒细化；力学性能
TiAl alloy; lamellar microstructure; cyclicheat treatment; grain refinement; mechanical properties
- 摘要:
- 片层 TiAl 合金因其低密度和优异的高温性能，成为 650~900 ℃下取代镍基高温合金的候选材料。 本文研
究了热等静压和循环热处理的联合工艺对 TiAl 基合金(Ti-47Al-7Nb-2.5V-1Cr,原子百分比)中片层团尺寸的影响。 结果
表明，TiAl 基合金热等静压后的微观组织分布很不均匀，但晶粒得到了细化。 经单级热处理(HT1)后，TiAl 基合金的片
层团尺寸较为粗大，达到毫米级；而经双温热处理(HT2:1 200 ℃/20 min→1 000 ℃/20 min)可得到几乎全部为等轴 γ 相
的组织；3 次热循环处理后的 TiAl 基合金中片层团得到细化，其尺寸为 50~80 μm，且相较于单级热处理的 TiAl 基合金
的力学性能得到显著提升。
The laminated TiAl-based alloy (Ti-47Al-7Nb-2.5V-1Cr, atomic percent) has been known as a candidate material to replace Ni-based superalloys at 650~900 ℃ due to their low density and excellent high temperature properties. In this paper, a novel method of refining the lamellar structure in TiAl-based alloys by the combination of hot isostatic processing and cyclic heat treatment is proposed. The results show that the microstructure of the TiAl-based alloy is not evenly distributed after hot isostatic pressure treatment, but its grains are further refined. Afterwards, the lamellar size of TiAl-based alloy is relatively large, up to millimeters, after single heat treatment (HT1). Nevertheless, almost all equiaxed γ phase can be obtained after double temperature heat treatment (HT2: 1 200 ℃/20 min→1 000 ℃/20 min). Moreover, the lamellar structure of the TiAl-based alloy is refined after 3 cyclic heat treatment, and its size ranges from 50 to 80 μm, of which the mechanical properties are significantly improved compared with those of the single stage heat treatment.