一种具有混合层片微结构的超塑性TiAl合金板材的制备方法
By optimizing the preparation method of TiAl alloy, a mixed α2/γ and β/γ lamellar microstructure was formed, which solved the problems of high preparation cost and size limitation, and realized the superplastic production of large-sized complex parts with an elongation of 498.5%.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HARBIN INST OF TECH
- Filing Date
- 2023-09-06
- Publication Date
- 2026-07-17
AI Technical Summary
Existing methods for preparing TiAl alloys are costly and complex, and the size of extruded bars or hot-forged billets is limited, making them unsuitable for preparing large and complex superplastic parts.
A method for preparing mixed lamellar microstructures was adopted. Through forging, hot isostatic pressing, cladding, rolling and stress-relief annealing, the hot rolling process parameters were optimized. Multi-pass rolling and annealing in the α(α2)+β(B2)+γ three-phase region were carried out and β+γ→α2 phase transformation temperature range to form α2/γ and β/γ mixed lamellar microstructures, which inhibited abnormal grain growth and improved superplasticity.
Under conditions of 900℃ and a strain rate of not less than 1×10-4s-1, the maximum elongation of TiAl alloy sheet reaches 498.5%, breaking through the superplasticity limitation of traditional alloys and making it suitable for the production of large-sized complex parts.
Smart Images
Figure CN117181838B_ABST