摘要
团结微观结构和 Ti-48Al-2Cr-2Nb 合金的张力的性质上的 Ni 增加的效果用微分扫描被调查热量测定(DSC ) ， X 光检查衍射(XRD ) ，与精力散的分光镜(版本) 装备的扫描电子显微镜学(SEM ) 和传播电子显微镜学(TEM ) 。与 3 at% Ni 增加，当演员组微观结构主要由好薄片状的殖民地(~ 50m ) 组成的结果表演，谷物和富有 Ni 的 <sub>3</sub> 阶段。在在 13800
The effects of Ni addition on solidification micro structure and tensile properties of Ti-48Al-2Cr-2Nb alloy were investigated using differential scanning calorimetry（DSC）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） equipped with energy-dispersive spectroscope（EDS） and transmission electron microscopy（TEM）.Results show that with 3 at%Ni addition,the as-cast micro structure is mainly composed of fine lamellar colonies（~50 μm）,γ grains and Ni-ridied τ_3 phase.After heat treatment at 1380℃,the Ni-containing alloy is characterized by fine fully lamellar micro structure（~90 μm）.The heat-treated Ni-containing specimen exhibits superior room temperature tensile properties than other specimens.The tensile properties are discussed in light of the microstructure evolution and role of Ni-riched τ_3 phase.
基金
financially supported by the National Natural Science Foundation of China(Nos.51001040,51371064 and 51504075)
the Shanghai Aerospace Science and Technology Innovation Fund(No.SAST201428)
