可溶性镁合金的制备及其性能

针对传统可溶性压裂球材质存在的缺点,采用铸造法制备性能优异的可溶性镁合金,系统研究了铝含量对可溶性镁合金组织、溶解性能及力学性能的影响.结果表明:可溶性镁合金组织由α-Mg和β-Mg17 Al12相组成,随着铝含量的增多,组织中β-Mg17 Al12相数量增多,呈连续网状分布于α相晶界处,并且α晶粒也变得粗大.可溶性镁合金在氯化钾(KCl)溶液中可自行溶解,且随KCl浓度的升高,溶解速率变大,在质量分数为3％的KCl中溶解性能最佳.随着铝含量的增加,可溶性镁合金的溶解速率变大,室温下溶解速率最高可达7.42 mg·h-1·cm-2.溶解产物粒度分析结果显示,中值粒径D50为38.691μm,溶解产物物相为Mg17 Al12和Mg(OH)2.可溶性镁合金的抗压强度最高可达430 MPa,变形量为3.0％时试样断裂,随着铝含量的增加,可溶性镁合金的塑性降低.

Preparation and properties of soluble magnesium alloys

Based on the shortcomings of the traditional fracturing ball, the soluble magnesium alloy with excellent properties was prepared by casting. This study investigated the effects of aluminum elements content on the microstructure, solubility, and mechanical properties. The results reveal that the microstructure of soluble magnesium alloy comprises the following two phases:α-Mg andβ-Mg17 Al12 . β-Mg17 Al12 increases with an increase in aluminum content and continuously distributes in theα-Mg grain boundary. In addition,α-Mg becomes coarse. The soluble magnesium alloy could dissolve in the KCl solution, and the dissolution rate increases with an in-crease in KCl concentration until the rate reaches a maximum at 3％ ( mass fraction) KCl;the rate subsequently decreases after reac-hing this maximum. In addition, the dissolution rate increases with an increase in aluminum content until the dissolution rate reaches 7. 42 mg·h-1·cm-2 . The corrosion product of the soluble magnesium alloy is finer, and the median grain size is 38. 691μm, which en-sures a smooth discharge of products, and the corrosion products are Mg17 Al12 and Mg( OH) 2 . The compressive strength of the soluble magnesium alloy could reach 430 MPa and the material breaks when the deformation reaches 3. 0％, which the plasticity of this material reduces with increased aluminum content.