Interfacial Microstructure and Shear Strength of Ti-6Al-4V/TiAl Laminate Composite Sheet Fabricated by Hot Packed Rolling
Interfacial Microstructure and Shear Strength of Ti-6Al-4V/TiAl Laminate Composite Sheet Fabricated by Hot Packed Rolling
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DOI：
10.1016/j.matdes.2011.02.052
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发表时间：
2011-06
影响因子：
8.4
通讯作者：
F. Kong;Yuyong Chen;Deliang Zhang
中科院分区：
文献类型：
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作者：
F. Kong;Yuyong Chen;Deliang Zhang
采用热轧工艺制备了界面组织均匀、界面无明显缺陷的Ti-6Al-4V(wt.%)/Ti-43Al-9V-Y(at.%)双层层状复合材料板材，并对其界面组织和剪切强度进行了表征。界面微观结构分析表明，TiAl侧存在厚度均匀的界面区，厚度约为250μm，界面由两层组成：TiAl侧的I层厚80μm，Ti-6Al-4V侧的层II厚170μm。第一层的组织由块状γ相、针状γ相和B2相组成，而第二层的组织由α2相组成。界面区组织是Ti-6Al-4V合金层中的Ti元素向TiAl合金层和TiAl合金层中的Al元素相互扩散的结果。剪切强度测试表明，TiAl合金与Ti-6Al-4V合金层之间的结合强度很高。这意味着多道次轧制实现的两层间界面结合质量高，且层间界面在传递载荷方面非常有效，使TiAl/Ti-6Al-4V层状复合材料板材的韧性和塑性显著提高。
A two layer Ti–6Al–4V(wt.%)/Ti–43Al–9V–Y(at.%) laminate composite sheet with a uniform interfacial microstructure and no discernible defects at the interfaces has been prepared by hot-pack rolling, and its interfacial microstructure and shear strength were characterized. Characterization of the interfacial microstructure shows that there was an interfacial region of uniform thickness of about 250μm which consisted of two layers: Layer I on the TiAl side which was 80μm thick and Layer II on the Ti–6Al–4V side which was 170μm thick. The microstructure of Layer I consisted of massive γ phases, needlelike γ phases and B2 phase matrix, while the microstructure of Layer II consisted of α2phase. The microstructure of the interfacial region is the result of the interdiffusion of Ti element from Ti–6Al–4V alloy layer into the TiAl alloy layer and Al element from the TiAl alloy layer into the Ti–6Al–4V alloy layer. The shear strength measurement demonstrated that the bonding strength between the TiAl alloy and Ti–6Al–4V alloy layers in the laminate composite sheet was very high. This means that the quality of the interfacial bonding between the two layers achieved by the multi-path rolling is high, and the interface between the layers is very effective in transferring loading, causing significantly improved toughness and plasticity of the TiAl/Ti–6Al–4V laminate composite sheet.