摘要
采用搅拌铸造法制备了漂珠/镁合金复合材料可溶压裂球。基于正交实验法,分析合金元素含量对复合材料溶解速率和抗压强度的影响。采用扫描电子显微镜(SEM)和X射线衍射仪(XRD)分析复合材料的微观组织和物相组成。通过浸泡实验和准静态压缩实验评价复合材料的溶解性能和力学性能,并通过扫描电子显微镜分析复合材料溶解后微观形貌和断口形貌,从而得到复合材料的溶解机理和断裂机制。实验结果表明,影响漂珠/镁合金复合材料溶解速率的合金元素的主次顺序为:Al>Zn>Ni>Cu,最优合金成分为:Al 15%, Zn 6%, Cu 1.5%, Ni 1%(质量分数)。漂珠/镁合金复合材料中除了α-Mg、漂珠和β-Mg17Al12外,还存在Mg2Si和MgO相。复合材料的最大溶解速率为11.96 mg·h^-1·cm^-2,抗压强度为352 MPa,相比于镁合金分别提高了93.5%和9.7%。溶解速率提高的主要原因是复合材料中分布着较多的漂珠和Mg2Si等相,与α-Mg形成腐蚀原电池,加速复合材料的溶解。抗压强度提高的主要原因是细晶强化、第二相强化和位错强化的共同作用。
The fly ash cenosphere/Mg alloy composites for degradable fracturing ball applications were prepared by stir casting method. Using orthogonal test method, the effects of alloying elements on the degradation rate and compressive strength of the composites were analyzed. Scanning electron microscopy(SEM) and X-ray diffractometer(XRD) were used to analyze the microstructure and phase composition of the composites. The degradation properties and mechanical properties of the composites were evaluated by immersion test and quasi-static compression test. The surface morphology after immersion test and the fracture morphology of the composites were analyzed by SEM, and the degradation mechanism and fracture mechanism of the composites were obtained. The experimental results showed that the order of the alloying elements affecting the degradation rate of the fly ash cenosphere/Mg alloy composites was: Al>Zn>Ni>Cu. The optimal alloy composition was: Al 15%, Zn 6%, Cu 1.5%, and Ni 1%(mass fraction). In addition to α-Mg, fly ash cenospheres and β-Mg17Al12, Mg2Si and MgO phases were also found in the composites. The maximum degradation rate of the composites was 11.96 mg·h^-1·cm^-2 and the compressive strength was 352 MPa, which was 93.5% and 9.7% higher than that of the Mg alloy, respectively. The main reason for the increase of the degradation rate was that there were more fly ash cenospheres, Mg2Si and other phases in the composite, and forming the corrosion cells with α-Mg, which accelerated the degradation of the composite. The main reasons for the increase of compressive strength were the combined effects of fine-grain strengthening, second-phase strengthening and dislocation strengthening.
作者
刘恩洋
于思荣
纪志康
牛亚峰
熊伟
曹宁
Liu Enyang;Yu Sirong;Ji Zhikang;NiuYafeng;Xiong Wei;Cao Ning(College of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2019年第8期792-799,共8页
Chinese Journal of Rare Metals
基金
山东省重点研发项目(2016GGX102041)
山东省自然科学基金项目(ZR2017LEM004)
中央高校基本科研业务费专项资金项目(18CX02091A)
石油天然气装备教育部重点实验室(西南石油大学)项目(OGE201702-07)资助
关键词
漂珠/镁合金复合材料
可溶压裂球
微观组织
溶解速率
抗压强度
fly ash cenosphere/Mg alloy composite
degradable fracturing ball
microstructure
degradation rate
compressive strength
