摘要
基于自主研发的ZBYT500多功能液态成形设备,采用挤压铸造工艺制备了ZM5镁合金隔板件,通过控制变量法探究了T4和T6热处理对铸件力学性能的影响。结果表明,经410℃×20 h固溶处理后,晶界和晶内的粗大第二相β-Mg_(17)Al_(12)基本全部溶解于α-Mg基体中,铸件的抗拉强度为228.37 MPa、屈服强度为91.49 MPa、伸长率为7.3%;经200℃×8 h时效处理,短棒状的β-Mg_(17)Al_(12)以非连续析出方式从晶界向晶内析出,而晶粒内部以连续析出方式析出颗粒状β-Mg_(17)Al_(12)第二相,提升了铸件整体力学性能,时效处理后抗拉强度为242.49 MPa、屈服强度为120.8 MPa、伸长率为3.9%。通过连续相场法进一步验证了镁合金中第二相的时效析出机制并结合试验中第二相形貌进行对比验证。结果表明,时效处理可以进一步提升铸件的抗拉强度,但是伸长率大幅下降,因此从综合性能方面考虑,T4处理后的ZM5镁合金隔板件更适合实际使用。
Based on the self-developed ZBYT500 multi-functional liquid forming equipment,ZM5 magnesium alloy baffle parts were prepared by squeeze casting process.The different heat treatments of T4 and T6 were explored by the control variable method.The effects of process parameters on mechanical properties of castings were analyzed.The results show that with the solution treatment at 41℃for 20 h,the coarse second phaseβ-Mg_(17)Al_(12)in the grain boundary and grain is basically dissolved in α-Mg matrix.The tensile strength,yield strength and elongation of castings reach up to 228.37 MPa,91.49 MPa and 7.3%,respectively.With the aging treatment at 200℃for 8 h,the short rod-shapedβ-Mg_(17)Al_(12)phase is precipitated from the grain boundary into the grain in a discontinuous precipitation manner,and the granularβ-Mg_(17)Al_(12)second phase is precipitated in the grains by continuous precipitation,improving the overall mechanical properties of the castings.The tensile strength,yield strength and elongation of the alloy are 242.49 MPa,120.8 MPa and 3.9%,respectively.The aging precipitation mechanism of the second phase in the magnesium alloy was further verified by continuous phase field method.Aging treatment can further improve the tensile strength of castings,however the elongation is greatly reduced.From the perspective of comprehensive performance,the ZM5 magnesium alloy baffle after T4 treatment is more suitable for practical use.
作者
景舰辉
陈利文
孙晓平
王凯乐
赵源
樊如意
侯华
赵宇宏
Jing Jianhui;Chen Liwen;Sun Xiaoping;Wang Kaile;Zhao Yuan;Fan Ruyi;Hou Hua;Zhao Yuhong(School of Materials Science and Engineering,Collaborative Innovation Center of Minisotry of Education and Shanxi Province for High-performance Al-Mg Alloy Materials,North University of China;School of Materials Science and Engineering,Taiyuan University of Science and Technology;Berjing Advanced Innovation Center for Materials Genone Engineening,University of Science and Technology Beijing)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第9期1168-1175,共8页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(52074246,22008224,52275390,52205429,52201146)
国防基础科研资助项目(JCKY2020408B002
WDZC 2022-12)
山西省专利转化专项计划资助项目(202303002)
山西省重点研发计划资助项目(202102050201011,202202050201014)
中北大学研究生科技立项资助项目(20201708)。
关键词
挤压铸造
镁合金
固溶处理
时效处理
力学性能
Squeeze Casting
Magnesium Alloy
Solution Treatment
Aging Treatment
Mechanical Properties
