Sm、Sb合金化对AZ61组织和性能影响的研究

Effects of Sb and Sm on microstructure and mechanical properties of AZ61 Alloy

摘要:

研究了铸态AZ61-1Sm-xSb合金，并对其进行了热挤压和时效处理（T5）。结果表明，AZ61-1Sm-xSb合金的主要合金相为β-Mg17Al12、Al2Sm、Al3Sm及SbSm。与AZ61相比，AZ61-1Sm中的Mg17Al12相呈现不连续分布的特征；而在AZ61-1Sm中添加Sb，Mg17Al12不连续分布特征更加明显，并且出现针状SbSm相，当 Sb添加量为1.5wt%时出现大块状SbSm相，而β-Mg17Al12、Al2Sm、Al3Sm均为颗粒状并呈弥散分布。Sm和Sb的添加能提高AZ61合金挤压和时效态合金力学性能，而在AZ61-1Sm合金中添加Sb元素能显著提高合金的高温强度。

Abstract:

The microstructure and mechanical properties of AZ61-1Sm-xSb alloy were investigated. The results shown that the mainly phase of AZ61-1Sm-xSb alloy were β-Mg17Al12, Al2Sm, Al3Sm and SbSm. Compared with AZ61, the shape of Mg17Al12 in AZ61-1Sm alloy are discontinuous; Due to the addition of Sm and Sb, the microstructure is further refined, and a new SmSb phase is formed. Addition of Sm and Sb enhanced the strength of hot-extruded and T5 AZ61 alloys at room temperature. Moreover adding Sb into AZ61-1Sm alloy could enhance its strength at 150℃ obviously.