Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment
来源期刊：Rare Metals2016年第1期
论文作者：Jian-Chao Han Shu-Long Xiao Jing Tian Yu-Yong Chen Li-Juan Xu Xiao-Peng Wang Yi Jia Shou-Zhen Cao
文章页码：26 - 34
摘 要：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 τ3 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 τ3 phase.
Jian-Chao Han1,2，Shu-Long Xiao1,2，Jing Tian1，Yu-Yong Chen1,2,3，Li-Juan Xu1，Xiao-Peng Wang1,2，Yi Jia1,2，Shou-Zhen Cao1,2
1. School of Materials Science and Engineering,Harbin Institute of Technology2. National Key Laboratory of Science and Technology on Precision Heat Processing of Metals,Harbin Institute of Technology3. State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology
摘 要：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 τ3 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 τ3 phase.
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