|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Control of Microstructure and Mechanical Property and Superplasticity for High Nb-TiAl Alloy Sheet
||Junpin Lin, Yongfeng Liang, Laiqi Zhang, Guojian Hao, Xiangjun Xu
|On-Site Speaker (Planned)
High Nb-TiAl alloys have been paid more and more attentions because of attractive properties such as high melting points, good oxidation resistance, high specific strengths and modulus, etc. High Nb alloying becomes the optimum method to raise the service temperature of TiAl alloy. Further potential components for aero engine exhaust nozzles and honeycomb structures are based on high Nb-TiAl sheet and foil material. Large scale high Nb-TiAl sheet was successfully fabricated by hot pack rolling direct from cast ingot. By control of rolling temperature, the typical microstructure of TiAl alloy can be obtained, such as DP, NG and NL, and the mechanical test shows that the NL microstructure with fine colony size exhibits excellent room and elevated temperature mechanical properties. The NG microstructure has outstanding superplasticity, and the elongation reaches 824% at 1050℃ and high strain rate. The strengthening/toughning mechanism of the sheet materials is discussed in this work.
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