提出了一种钛合金三维点阵夹层结构制备方法,采用超塑成形/扩散连接工艺(SPF/DB)制备了金字塔型、四面体型、X型三维点阵夹层结构,在SPF/DB制备工艺中,采用的是五层板材,四层超塑成形工艺,成形出的结构是三层夹层结构,其中扩散连接工艺为:920℃/2 MPa/2 h,超塑成形工艺为:920 ℃/2 MPa/2 h.通过压缩试验测试了不同点阵结构类型、单元尺寸、点阵层数的压缩性能,并进行了对比分析.研究表明,钛合金三维点阵结构在压缩变形机制主要包括:弹性变形、弹性屈曲、塑性屈曲、筋条断裂,这些变形机制导致点阵结构的压缩曲线呈现应力波动的特征.四面体点阵结构具有最高的抗压强度,金字塔型点阵结构具有最高的抗压模量,X型点阵结构的抗压强度最小,抗压模量居中.随着单元尺寸和点阵层数的增加,钛合金三维点阵的抗压强度和抗压模量迅速降低.
A new fabrication method of superplastic forming/diffusion bonding(SPF/DB) was used to form titanium alloy three dimensional structure,and three types lattice structures of pyramid,tetrahedron,X type were fabricated,respectively.In the SPF/DB process,five sheets were used through the four-layer process to fabricate a three-layer sandwich structure.The diffusion bonding process parameters were 920 ℃/2 MPa/2 h,and the superplastic forming process parameters were 920 ℃/2 MPa/2 h.Then the compressing behavior of different lattice structure types,cell dimension,layer number was studied and compared.Compression tests of different types,cell size,and layer number of lattice structure were tested.Research results showed that the deformation mechanism of titanium alloy with three-dimensional lattice structure mainly included:elastic deformation,elastic buckling,plastic buckling,rib fracture.These deformation mechanisms led to the compression curve of lattice structure showing significant stress fluctuation.In the three type lattice structures,the tetrahedral lattice structure had the highest compressive strength,the pyramid type lattice structure had the highest compressive modulus,and the X type lattice structure had the lowest compressive strength,and the compressive modulus was in the middle.With the increase of cell size and the number of layers,the compressive strength and compressive modulus of the 3D lattice structure of titanium alloy rapidly decreased.
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