热轧变形量对Mg-11.8Gd-2.3Y-0.5Zr-0.5Ag-0.4Er合金显微组织及力学性能的影响
Effect of hot rolling deformation on microstructure and mechanical properties of Mg-11.8Gd-2.3Y-0.5Zr-0.5Ag-0.4Er alloy
蒋文天 1王若愚 1彭健 1刘华山1
作者信息
- 1. 中南大学 材料科学与工程学院,长沙 410083
- 折叠
摘要
以Mg-11.8Gd-2.3Y-0.5Zr-0.5Ag-0.4Er(质量分数,%)合金为实验材料,研究了热轧变形量对组织演变和性能的影响.结果表明:当热轧变形量从20%增至40%时,非基面滑移系施密特因子增加,孪晶减少;继续增大热轧变形量,非基面滑移系的平均施密特因子(Fs)随之降低,孪晶也随之增多.合适的热轧变形量促进非基面滑移并抑制基面滑移与孪生.因此,当热轧变形量为40%时,非基面滑移活跃,位错密度增加,孪晶减少,位错强化和织构强化达到峰值,合金的屈服强度分别为290 MPa和8.5%.当热轧变形量增至60%时,非基面滑移活跃,位错密度下降,孪晶增多,合金的屈服强度降至230 MPa,伸长率达到12.9%.这说明控制热轧变形量可调控非基面滑移和孪生,有助于提升高Gd含量稀土镁合金的综合力学性能.
Abstract
The Mg-11.8Gd-2.3Y-0.5Zr-0.5Ag-0.4Er(mass fraction,%)alloy was used as experimental material to study the effects of different hot rolling deformations on the microstructure and properties.The results show that the Schmidt factor of non-basal slip systems increases and the twins decrease when the hot rolling deformation increases from 20%to 40%.With the hot rolling deformation increases,the average Schmid factor(Fs)of non-basal slip systems decreases and the twins increases.Proper hot rolling deformation can induce the non-basal slips,and inhibit the basal slip and twinning.The alloy with hot rolling deformation of 40%has the highest yield strength(290 MPa)and the lowest elongation(8.5%),because of the non-basal slips of alloy become active,the dislocation density increases,the twins decrease.On contrast,when the hot rolling deformation increases to 60%,the non-basal slips of alloy become active,the dislocation density decreases and the twins increase,the yield strength decreases to 230 MPa,and the elongation reaches 12.9%.It proves that adjusting dislocation slip and twinning by controlling hot rolling deformations is helpful to improve the comprehensive mechanical properties of rare earth Mg alloy with high Gd content.
关键词
Mg-Gd-Y基合金/热轧/织构/位错滑移/孪生/强化机制Key words
Mg-Gd-Y alloy/hot rolling/texture/dislocation slip/twinning/strengthening mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据