A high-performance b-stabilized Ti-43Al-9V-0.2Y alloy sheet with a nano-scaled antiphase domain
A high-performance b-stabilized Ti-43Al-9V-0.2Y alloy sheet with a nano-scaled antiphase domain
复制标题
具有纳米级反相域的高性能b稳定Ti-43Al-9V-0.2Y合金片
DOI：
10.1016/j.matlet.2017.12.002
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发表时间：
2017
影响因子：
3
通讯作者：
Yuyong Chen
中科院分区：
文献类型：
--
作者：
Yu Zhang;Xiaopeng Wang;Fantao Kong;Yuyong Chen
在（α + γ）相区（1260 °C）采用热包轧制工艺制备了一种具有纳米级反相畴（APD）组织和优异性能的新型β稳定Ti-43 Al-9V-0. 2 Y合金板材。由于多道次轧制过程中的温降和再加热，在α → β + γ和α → α2+ γ相变过程中形成了不均匀的规则的APD混合片层组织。两个纳米APD结构（平均尺寸：15 nm）之间的反相边界（APB）被确定为一种原子位移，它是由α 2相的无序-有序转变引起的.此外，与相应的锻造态合金和其他热加工β-稳定化TiAl合金相比，本合金板材在室温和高温下均表现出更高的强度。拉伸性能的改善主要归因于由精细的纳米级APD/片层混合结构组成的双重组织。
A novel β-stabilized Ti-43Al-9V-0.2Y alloy sheet with a nano-scaled antiphase domain (APD) microstructure and excellent performance was fabricated via hot-pack rolling in the (α + γ) phase region (1260 °C). Owing to the temperature drop and reheat associated with multi-pass rolling, heterogeneous and regular APD-mixed lamellar structures formed with the occurrence of α → β + γ and α → α2+ γ phase transformations. The antiphase boundary (APB) between two nano-scaled APD structures (average size: ∼15 nm) is identified as a type of atomic shift, which is induced by the disorder-order transformation in the α2phase. Moreover, compared with the corresponding as-forged alloy and other hot-working β-stabilized TiAl alloys, the current alloy sheet exhibited higher strength both at room and elevated temperatures. The improvement in the tensile properties is attributed mainly to the duplex microstructure consisting of fine nano-scaled APD/lamella mixed structures.