γ-TiA1/TC4复合板材的制备及组织性能研究

Preparation of γ-TiAl/TC4 Composite Sheet and Its Microstructure and Properties

提出了制备γ-TiAl/Ti合金复合板材的技术思想。采用包套轧制技术在1150℃轧制出厚度为3mm的Ti-43Al-9V-0.3Y/Ti-6Al-4V复合板材,其中Ti-43Al-9V-0.3Y合金层的厚度约为2.3mm,Ti-6Al-4V合金层的厚度约为0.7mm。复合板材的总变形量为80%。包套轧制后板材外形完整、无应力开裂。分析表明,复合板材的界面相主要由α2-Ti3Al构成。拉伸性能测试结果表明,随着Ti-6Al-4V合金层厚度的增加,复合板材室温下的抗拉强度、延伸率都得到了显著的提高。当Ti-6Al-4V合金层厚度达到0.7mm时(板材总厚2mm),室温强度和延伸率分别超过800MPa和4%,700℃条件下延伸率超过25%。

A new technique idea of γ-TiAI/Ti alloy composite sheet preparation was presented. Ti-43Al-9V-0.3Y/Ti-6Al-4V composite thin sheet with 3 mm thickness was produced by clad rolling technology at 1150 ℃ with 80 % total deformation amount. The thickness of Ti-43Al-9V-0.3Y alloy and Ti-6Al-4V alloy is about 2.3 mm and 0.7 mm in the composite sheet, respectively. The composite sheet after clad rolling has intact shape without stress cracking. Analyses show that the interface phases of the composite sheet are mainly composed of α2-Ti3Al. Tensile test reveals that, with increase of Ti-6Al-4V thickness, both the tensile strength and elongation are obviously increased at room temperature. When the thickness of the Ti-6Al-4V layer reaches up to 0.7 mm （the total thickness is 2 mm）, the tensile strength and elongation of the composite sheet exceed 800 MPa and 4% at room temperature, respectively. And elongation of the composite sheet exceeds 25% at 700℃.