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Effect of Ni on the microstructure, mechanical properties and corrosion behavior of MgGd_1Ni_(x) alloys for fracturing ball applications

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Journal of Materials Science & Technology 2021年第32期91卷 121-133页

作者： Kai Ma Shijie Liu Chaoneng Dai Xiuying Liu Jie Ren Yuanlang Pan Yinhong Peng Chen Su Jingfeng Wang Fusheng Pan National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

The effects of Ni addition on the mechanical properties, corrosion behaviors, and corrosion mechanism of Mg Gd_1 Ni_(x) alloys have been investigated by compressive tests, weight loss, hydrogen evolution, and scanning electron microscopy. The results show that the constitution of the second phase is large dependence on Ni/Gd molar ratios, which can transform from LPSO(long-period stacking ordered)+Mg_5 Gd,LPSO to eutectic phase. In addition, with increasing Ni/Gd molar ratios, the content of second phase increases gradually, while the LPSO phase shows a parabola relationship. Furthermore, the formation of Nicontaining LPSO phase not only can improve the strength but also accelerate the degradation of Mg alloys owing to the galvanic corrosion. The optimal properties with ultimate compressive strength, degradation rate are 340 MPa, 2066 mm/y for Mg Gd1 Ni0.75, respectively, which can meet the engineering application standard of fracturing ball and can be used as candidate materials for fracturing ball.

关键词： MgGd_1Ni_(x)alloys LPSO Galvanic corrosion fracturing ball

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Enhanced mechanical properties and degradation rate of Mg-Ni-Y alloy by introducing LPSO phase for degradable fracturing ball applications

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Journal of Magnesium and Alloys 2020年第1期8卷 127-133页

作者： Jingfeng Wang Shiqing Gao Xiuying Liu Xing Peng Kui Wang Shijie Liu Weiyan Jiang Shengfeng Guo Fusheng Pan National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Faculty of Materials and Energy Southwest UniversityChongqing 400715China

In this work,as-cast Mg-Ni-Y alloys were proposed to develop a feasible material for fracturing balls,and their mechanical performance and corrosion behavior were systematically *** period stacking order(LPSO)phase was firstly introduced to improve both the mechanical properties and degradation rate of magnesium *** the increase of LPSO phase,the compressive strength was improved significantly,while the elongation of the alloys decreased owing to the relatively brittle nature of LPSO *** to the higher corrosion potential of LPSO phase,the LPSO phase can accelerate the corrosion process by providing more ***,the LPSO phase would serve as the corrosion barrier between the corrosion medium and the matrix when the contents of LPSO phase are too high in Mg92.5Ni3Y4.5 and Mg87.5Ni5Y7.5 ***-cast Mg97.5Ni1Y1.5 alloy with satisfactory mechanical properties and rapid degradation rate was successfully developed,exhibiting a high degradation rate of 6675 mm/a(93℃)in 3 wt.%KCl solution and a favorable ultimate compressive strength of 410 *** degradation rate of Mg97.5Ni1Y1.5 alloy is 2-5 times of the current commercial magnesium alloy fracturing materials.

关键词： Mg-Ni-Y magnesium alloys fracturing ball LPSO phase Degradation rate Mechanical properties

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