研究了热变形作用下β型γ-TiA1合金Ti-43Al-4Nb-2Mo-0.5B (at％)的组织演变过程,以及锻态组织的高温超塑性变形行为.结果表明:包套锻造过程中,层片晶结构发生快速分解L(a/γ)→γ+β,γ和β晶粒发生显著的动态再结晶,锻态组织主要由大角度晶界的γ和B2细晶组成;该合金大角度晶界为主的γ+B2/β细晶变形组织在900～950℃之间表现出典型的低温超塑性变形行为,950℃/l.0× 10-4s-1时延伸率可达405％;超塑性变形过程中残余层片晶结构完全分解,γ和B2/β晶粒进一步动态再结晶细化;γ和B2/β晶粒的晶界滑移是该合金超塑性变形的主要变形机制.
参考文献
| [1] | 肖树龙,徐丽娟,于宏宝,陈玉勇.稀土Y对SPS烧结TiAl基合金显微组织与力学性能的影响[J].稀有金属材料与工程,2013(01):23-27. |
| [2] | Imayev VM.;Imayev RM.;Kuznetsov AV.;Shagiev MR.;Salishchev GA. .Superplastic properties of Ti-45.2Al-3.5(Nb,Cr,B) sheet material rolled below the eutectoid temperature[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):15-21. |
| [3] | Imayev VM.;Imayev RM.;Kuznetsov AV.;Shagiev MR.;Salishchev GA. .Superplastic properties of Ti-45.2Al-3.5(Nb,Cr,B) sheet material rolled below the eutectoid temperature[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):15-21. |
| [4] | Sun J.;He YH.;Wu JS. .Characterization of low-temperature superplasticity in a thermomechanically processed TiAl based alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(0):885-890. |
| [5] | Wang JN;Wang Y .An investigation of the origin of the superplasticity of cast TiAl alloys[J].International Journal of Plasticity,2006(8):1530-1548. |
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