摘要
研究了微量Sr、Y对具有bcc结构的Mg-14Li-1Al(LA141)合金铸态及挤压态微观组织和力学性能的影响。结果表明,在LA141合金中添加Sr或Y后,晶粒明显细化。挤压态合金的力学性能得到提高,这主要和第二相粒子(Al4Sr、Al2Y等)的形成以及挤压过程中发生的动态再结晶有关。LA141-0.3Y合金在室温下具有较好的力学性能(抗拉强度:161 MPa,屈服强度:154 MPa,伸长率:26%)。
The effects of trace Sr and Y on the microstructure and mechanical properties of cast and as-extruded LAl41 alloy with bee structure were investigated. The results show that the additions of Y and/or Sr produce remarkable grain refining in LAl41 alloy. The mechanical properties of the as-extruded alloys improve mainly depending on the formation of ALSr and Al2Y phases and the dynamic recrystallization during extruding process. The LAl41-0.3Y alloy has better mechanical properties (UTS: 161 MPa; YS: 154 MPa; Elongation: 26%).
出处
《热加工工艺》
CSCD
北大核心
2016年第14期67-70,共4页
Hot Working Technology
基金
内蒙古自治区自然科学基金项目(2015BS0512)
内蒙古科技大学创新基金项目(2014QDL016)
关键词
镁锂合金
微观组织
力学性能
Mg-Li alloy
microstructure
mechanical properties