热轧加工工艺对快速降解Mg-Li合金力学性能及腐蚀行为的影响  

Effect of Hot Rolling Process on Mechanical Property and Corrosion Behavior of Rapidly Degrading Mg-Li Alloy

作　　者：庞梦瑶 巫瑞智 马晓春 靳思远 于哲 Krit Boris PANG Mengyao;WU Ruizhi;MA Xiaochun;JIN Siyuan;YU Zhe;Krit Boris(Key Laboratory of Superlight Materials&Surface Technology,Ministry of Education,HarbinEngineering University,Harbin150001,China;Moscow Aviation Institute,National Research University,Moscow 125993,Russia)

机构地区：[1]哈尔滨工程大学超轻材料与表面技术教育部重点实验室,哈尔滨150001 [2]Moscow Aviation Institute,National Research University,Moscow 125993,Russia

出　　处：《金属学报》2025年第3期509-520,共12页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目Nos.52261135538、U21A2049、52271098和U23A20541;俄罗斯科学基金项目No.23-49-00098;中国博士后科学基金项目No.GZC20233424;黑龙江省博士后基金项目No.LBH-Z23116。

摘　　要：在油气生产中,可降解压裂材料可提高油气资源生产效率。对于快速降解的压裂材料,在保持高降解速率的同时,还要求具有较好的力学性能。本工作在前期获得具有高腐蚀速率的Mg-8Li-4Gd-1.5Ni铸态合金的基础上,对合金进行热轧加工,通过调控变形组织进一步提升合金的力学性能和腐蚀速率。结果表明,在轧制过程中,合金中的网状长周期堆垛有序结构相(LPSO相)逐渐转变为平行的纤维状,变形量达90%时LPSO相会形成较短的纤维状。合金在热轧过程中出现再结晶组织,GdNi_(3),颗粒细化。变形量70%时合金抗拉强度最高,达217MPa,延伸率为17%。在3%KCl溶液中,变形量为90%时合金在25及93℃时均有最高的腐蚀速率,失重速率分别为0.47及3.63mg/(cm^(2)·min)25℃时腐蚀电流密度最高,为5.34mA/cm^(2)。平行分布的LPSO相对合金的腐蚀有阻碍作用,但是LPSO相的弯曲、第二相的破碎、再结晶和位错密度的增加使合金内部的化学活性增强,导致腐蚀速率逐渐增高。热轧使合金中位错密度增加,晶粒尺寸减小,并发生再结晶,这些组织演变导致合金发生加工硬化和细晶强化,使得合金力学性能提升。Oil and gas resources have become strategic assets,highlighting the need to improve production efficiency.Segmented fracturing technology effectively addresses the challenge of low fracturing efficiency and is widely used in oil and gas extraction.Therefore,the demand for degradable fractur-ing materials has increased rapidly to enhance oil and gas production efficiency.Rapidly degradable fracturing materials must achieve high degradation rates,while maintaining strong mechanical properties to ensure effective petroleum fracturing operations.Building on previous research on as-cast Mg-8Li-4Gd-1.5Ni alloys that are known for their high corrosion rates,this study performed hot rolling at 250℃,with deformations of 30%,50%,70%,and 90%.Further,SEM,TEM,tensile mechanical performance testing,electrochemical testing,and hydrogen evolution measurements were used to examine the microstructure,mechanical properties,and corrosion behavior of the alloys.Results indicated that the microstructure underwent continuous elongation during rolling,and the networked long-period stacking ordered(LPSO)phases gradually transformed into parallel fibrous structures.At a deformation of 90%,the elongated fibrous LPsO phases were fractured into shorter segments,accompanied by an increase in the size and number of gaps between the LPsO phases.Recrystallized structures developed during hot rolling,accompanied by the refinement of GdNi_(3),particles and an increase in the dislocation density.As the deformation increased,the tensile strength of the alloy initially increased and then decreased.The alloy exhibited the highest tensile strength of 217 MPa and an elongation of 17%at a deformation of 70%.In a 3%KCl solution,the mass loss rate,hydrogen evolution volume,and hydrogen evolution rate of the alloy increased steadily,as the deformation increased.At a deformation of 90%,the alloy exhibited the highest corrosion rates at 25 and 93 C,with mass loss rates of 0.47 and 3.63 mg/(cm^(2)·min),respectively.Compared with the as-cast alloy,the weight

关 键 词：MG-LI合金 压裂 轧制 腐蚀行为 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]