CAJ | 학술논문

采用单辊快速凝固法制备出Mg 80?x Al x Cu 15 Y 5(x=0，1)合金薄带，再将薄带在不同温度下进行退火处理，利用XRD、DSC和HRTEM分析Al元素对Mg 80?x Al x Cu 15 Y 5(x=0，1)合金薄带的非晶形成能力及热稳定性的影响。结果表明：Al的加入使得Mg-Cu-Y合金的玻璃转变温度和初始结晶温度升高，过冷液相区宽度ΔT x因Al部分置换Mg而增大，约化玻璃转变温度T rg从0.616升至0.631，合金的非晶形成能力及热稳定性提高。随着退火温度的升高，Mg 79 Al 1 Cu 15 Y 5合金的晶化率低于Mg 80 Cu 15 Y 5合金的。当退火温度为523 K时Mg 80?x Al x Cu 15 Y 5(x=0，1)合金均发生明显晶化，在非晶基体上弥散析出大量HCP-Mg和Mg 2 Cu纳米颗粒；当温度升高至573 K时，Mg 79 Al 1 Cu 15 Y 5合金中有针状AlMg化合物相形成。
채용단곤쾌속응고법제비출Mg 80?x Al x Cu 15 Y 5(x=0，1)합금박대，재장박대재불동온도하진행퇴화처리，이용XRD、DSC화HRTEM분석Al원소대Mg 80?x Al x Cu 15 Y 5(x=0，1)합금박대적비정형성능력급열은정성적영향。결과표명：Al적가입사득Mg-Cu-Y합금적파리전변온도화초시결정온도승고，과랭액상구관도ΔT x인Al부분치환Mg이증대，약화파리전변온도T rg종0.616승지0.631，합금적비정형성능력급열은정성제고。수착퇴화온도적승고，Mg 79 Al 1 Cu 15 Y 5합금적정화솔저우Mg 80 Cu 15 Y 5합금적。당퇴화온도위523 K시Mg 80?x Al x Cu 15 Y 5(x=0，1)합금균발생명현정화，재비정기체상미산석출대량HCP-Mg화Mg 2 Cu납미과립；당온도승고지573 K시，Mg 79 Al 1 Cu 15 Y 5합금중유침상AlMg화합물상형성。
Mg 80?x Al x Cu 15 Y 5 (x=0,1) alloy ribbons were prepared by single-roll rapidly solidification method. Then the samples were annealed at various temperatures. The effects of Al on the glass forming ability (GFA) and thermal stability of Mg 80?x Al x Cu 15 Y 5 (x=0,1) alloys were studied by XRD, DSC and HRTEM. The results show that Al addition enhances the glass transition temperature and the onset temperature of crystallization of Mg-Cu-Y alloy. The width of supercooled liquid region ΔT x is found to become larger with partial substitution of Mg by Al, and the reduced glass transition temperature T rg increases slightly from 0.616 to 0.631, which result in the improvement of the glass forming ability and thermal stability. With the increase of annealing temperature, the crystallization degree of Mg79Al1Cu15Y5 alloy is lower than that of Mg80Cu15Y5 alloy. The remarkable crystallization behavior of Mg80?xAlxCu15Y5(x=0,1) alloys occurs after being annealed at 523 K, while the dispersed precipitation of HCP-Mg and Mg 2 Cu nanoparticles takes place in the amorphous phase matrix. The acicular-shaped AlMg compound phase is formed in Mg79Al1Cu15Y5 alloy annealed up to 573 K.