Ti-Cu-Mo层状复合材料的轧制行为与力学性能

Rolling behavior and mechanical properties of Ti-Cu-Mo laminated composites

以Ti箔、Cu箔和Mo箔为原料,采用热压法制备Ti-Cu-Mo层状复合材料,随后进行热轧加工,研究材料的轧制行为以及轧制量对复合材料各层组织演化规律的影响,并进一步揭示组元层及界面结构对复合材料整体强塑性的影响机理。结果表明,轧制主要引起Ti-Cu-Mo层状复合材料中Cu层组织细化与持续硬化,而对Ti层和Mo层影响较小。复合材料的屈服强度总体符合混合法则,受组元层硬化与颈缩的影响。采用80%的轧制量时,Cu层充分硬化而Mo层不发生颈缩断裂,可获得具有较高屈服强度(561 MPa)与良好塑性(伸长率7%)的Ti-Cu-Mo复合材料。

Ti-Cu-Mo laminated composites were fabricated through hot pressing and subsequent hot rolling by using Ti,Cu and Mo foils as raw materials.The effect of rolling behavior of Ti-Cu-Mo laminated composites and the rolling amount on the microstructure evolution of each layer were studied,and the influence mechanism of component layer and interface structure on the overall strength and plasticity of the composites was further revealed.The results show that hot rolling mainly results in refining and continuous hardening of Cu layers,but has limited influence on Ti and Mo layers in Ti-Cu-Mo laminated composites.The yield strength of the composites conforms to the rule of mixing,but it is also affected by the hardening and necking of the layer components.The Ti-Cu-Mo laminated composite achieves satisfied combination of yield strength(561 MPa)and plasticity(elongation is 7%)at a rolling deformation of 80%,mainly due to the sufficient hardening of Cu layers and the continuity maintaining of Mo layers.