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Interface microstructure regulation of Mg/Ti bimetals by thermal diffusion treatment of Ni-coated TC4 alloy
Intermetallics ( IF 4.3 ) Pub Date : 2022-05-25 , DOI: 10.1016/j.intermet.2022.107594
Jianhua Zhao , Fulin Wen , Kaiqing Feng , Cheng Gu , Yajun Wang

In the present work, solid-liquid compound casting process was used to fabricate TC4/AZ91D bimetals using thermal diffused Ni-coated TC4 alloy. The effects of thermal diffusion time of Ni-coated TC4 alloy on interface microstructure evolution and mechanical features of TC4/AZ91D bimetals were investigated. The interface microstructure has undergone the evolution of NiTi2, NiTi and Ni3Ti to NiTi2, NiTi and Ni2Ti4O (Mg) at Ni–Ti interface and (Mg2Ni + α-Mg) eutectic structure + Ni2Mg3Al ternary phase to eutectic-free (only Al3Ni, Al3Ti and Ni2Mg3Al) at Ni–Mg interface as the thermal diffusion time of Ni-coated TC4 alloy increased from 0.5 h to 5 h and 9 h. The maximum shear strength of 105.2 MPa was obtained for the eutectic-free interface of TC4/AZ91D bimetals when Ni-coated TC4 alloy were thermal diffused by 5 h. The rupture of TC4/AZ91D bimetals mainly takes place at (Mg2Ni + α-Mg) eutectic structure or between the interface of Ni3Ti layer/(Mg2Ni + α-Mg) eutectic structure when the thermal diffusion time of Ni-coated TC4 alloy is 0.5 h. Besides, with the thermal diffusion time increases to 5 and 9 h, the rupture occurs at the NiTi2 and Ni2Ti4O (Mg) reaction layers, respectively.



中文翻译:

Ni包覆TC4合金热扩散处理Mg/Ti双金属界面显微组织

在目前的工作中,采用固液复合铸造工艺,使用热扩散镀镍 TC4 合金制造 TC4/AZ91D 双金属。研究了镀镍TC4合金的热扩散时间对TC4/AZ91D双金属界面组织演变和力学性能的影响。界面组织经历了NiTi 2、NiTi 和Ni 3 Ti 向NiTi 2、NiTi 和Ni 2 Ti 4 O (Mg) 在Ni-Ti 界面和(Mg 2 Ni + α-Mg) 共晶结构+ Ni 2的演变Mg 3 Al 三元相至无共晶(仅 Al 3 Ni、Al 3 Ti 和 Ni 2 Mg3 Al)在 Ni-Mg 界面处,随着 Ni 涂层 TC4 合金的热扩散时间从 0.5 小时增加到 5 小时和 9 小时。当镀镍 TC4 合金热扩散 5 h 时,TC4/AZ91D 双金属无共晶界面的最大剪切强度为 105.2 MPa。TC4/AZ91D双金属的破裂主要发生在(Mg 2 Ni + α-Mg)共晶结构或Ni 3 Ti层/(Mg 2 Ni + α-Mg)共晶结构的界面之间涂层 TC4 合金为 0.5 小时。此外,随着热扩散时间增加到 5 h 和 9 h,破裂分别发生在 NiTi 2和 Ni 2 Ti 4 O (Mg) 反应层。

更新日期:2022-05-27
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