摘要
以石墨型铸造Mg-10Al-1Zn合金为原料,通过观察样品的显微组织、测试样品的布氏硬度,来分析均匀化处理后不同的冷却速度对样品组织和性能的影响。结果表明:在420℃保温24 h连续冷却后,合金中的β-Mg17Al12相均以层片状的形态析出。随着冷却速度的减小,β-Mg17Al12相析出数量逐渐增多直至完全析出。经均匀化连续退火后,合金的布氏硬度值均比铸态58.7 HB有所提高,且随着冷却速度的减小布氏硬度呈现先升高后下降的趋势,在冷却速度为0.0183 K·s-1时到达最高值81.2 HB。
The graphite mold casting Mg-10Al-1Zn magnesium alloy is used as main raw material, and the microstructure and brinell hardness of the samples are tested. Then the influence of different cooling rate after homogenizing on the microstructure and properties of samples are analyzed. The results show that β-Mg17Al12 phase is uniformly precipitated at lamellar morphology after homogenizing at 420℃ for 24 h and then continuous cooling. With the cooling rate decreased, the amount of precipitated β-Mg17Al12 phase increased until complete precipitation. When homogenized continuous annealing, the hardness of alloy is higher than the cast, and the hardness of the cast is 58.7HB. With the cooling rate decreased, the hardness first increased and then decreased, the highest hardness approaches 81.2HB when the cooling rate at 0.0183K·s-1.
出处
《商洛学院学报》
2016年第2期39-42,共4页
Journal of Shangluo University
基金
商洛学院科研基金项目(12SKY-FWDF006)
