CAJ | 학술논문

采用自制的设备,用快速凝固粉末冶金方法制备了AZ91镁合金,分别对合金进行光学金相、XRD、HRTEM、SEM分析.结果表明:粉末态为非常均匀细小的等轴晶组织,晶粒大小为1～5 μm,只有很少析出相,析出相为AlMg_2Zn.挤压棒材为细小的等轴晶组织,有大量的析出相,主要为β-Al_(12)Mg_(17)和AlMg_2Zn.合金有很高的力学性能,抗拉强度达到383.2 MPa,屈服强度275.1 MPa.合金的析出相形貌主要为近球形,大小为50～200 nm,挤压态的析出相明显增多.
채용자제적설비,용쾌속응고분말야금방법제비료AZ91미합금,분별대합금진행광학금상、XRD、HRTEM、SEM분석.결과표명:분말태위비상균균세소적등축정조직,정립대소위1～5 μm,지유흔소석출상,석출상위AlMg_2Zn.제압봉재위세소적등축정조직,유대량적석출상,주요위β-Al_(12)Mg_(17)화AlMg_2Zn.합금유흔고적역학성능,항랍강도체도383.2 MPa,굴복강도275.1 MPa.합금적석출상형모주요위근구형,대소위50～200 nm,제압태적석출상명현증다.
AZ91 magnesium alloy was prepared by rapid solidification and powder metallurgy technology with self-made equipment. Microstructures of the alloy materials were observed by optical microscope(OM), XRD, HRTEM and SEM. The results showed that the powders had a uniform, fine, equiaxed grain structure with a grain size of 1～5 μm and only a few precipitated phases, AlMg_2Zn. The as-extruded alloy bars retained the equiaxed grain structure but had a large number of precipitated phases, β-Al_(12)Mg_(17) and AlMg_2Zn. The alloy exhibited excellent mechanical properties. The tensile strength and yield strength were 383.2 MPa and 275.1 MPa respectively. The precipitated phases were mostly subsphaeroidal, about 50～200 nm in size, and obviously increased in the extruded material.