目的 通过改变轧制变形量探究TA1钛箔在轧制过程中的织构演变规律,以达到改善钛箔各向异性的目的。方法 通过电子束熔炼炉制备纯钛板,再经过多次热轧后退火3 h的方法得到0.5 mm的钛箔。在室温下对钛箔进行交叉轧制,得到变形量为10%、30%、50%的样品。通过金相显微镜、电子背散射衍射技术、电子万能试验机、场发射扫描电镜等手段对不同轧制变形量钛箔的微观组织、织构演变、力学性能、断口形貌进行表征和分析。结果 随着轧制变形量的增加,晶粒逐渐细化,孪晶数量逐渐增多,孪晶界阻碍位错运动,使钛箔的抗拉强度显著提高。在低变形量（0%~30%）条件下,对TA1钛箔的各向异性影响较小,在变形量为50%时,基面织构较为分散,屈服强度趋于一致,表现为弱的各向异性。TA1钛箔的强度随着轧制变形量的增大呈现上升的趋势,原始钛箔在TD和RD方向上的抗拉强度分别为167 MPa和150 MPa,当轧制变形量为50%时,抗拉强度达到了501 MPa（TD）和492 MPa（RD）。钛箔在不同轧制变形量下的拉伸断口形貌大体一致,由韧窝构成,均为韧性断裂。结论 当交叉轧制变形量为50%时,纵横差值减小,基面织构呈分散分布,在提高材料强度的同时有效改善了钛箔各向异性。
Abstract
The work aims to explore the texture evolution law of TA1 titanium foil during rolling by changing the rolling deformation, so as to improve the anisotropy of titanium foil. A pure titanium plate was prepared by electron beam melting furnace, and then the titanium foil of 0.5 mm was obtained after annealing for 3 h after several hot rolling. The titanium foil was cross rolled at room temperature to obtain samples with 10%, 30%, and 50% deformation. The microstructure, texture evolution, mechanical properties and fracture morphology of the titanium foil with different rolling deformation were characterized and analyzed by metallographic microscope, electron backscatter diffraction technique, electronic universal testing machine and field emission scanning electron microscope. With the increase of rolling deformation, the grain was gradually refined and the number of twins was gradually increased. The twin boundary hindered the dislocation movement and significantly improved the tensile strength of the titanium foil. Under the condition of low deformation (0%-30%), the effect on anisotropy was small. When the deformation was 50%, the substrate texture was more dispersed, and the yield strength tended to be uniform, showing weak anisotropy. The strength of TA1 titanium foil showed a rising trend with the increase of rolling deformation. The tensile strength of the original titanium foil in TD and RD directions was 167 MPa and 150 MPa, respectively. When the rolling deformation was 50%, the tensile strength reached 501 MPa (TD) and 492 MPa (RD). The tensile fracture morphology of the titanium foil under different rolling deformation was generally consistent, which was composed of dimples and ductile fracture. In conclusion, when the cross rolling deformation is 50%, the vertical and horizontal difference decreases and the basic surface texture is dispersed, which improves the strength of the material and the anisotropy of the titanium foil effectively.
关键词
TA1钛箔 /
交叉轧制 /
各向异性 /
织构演变 /
力学性能
Key words
TA1 titanium foil /
cross rolling /
anisotropy /
texture evolution /
mechanical properties
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