不同Gd含量对变形Mg-Zn-Gd合金织构和室温成形性能的影响

Influence of Gd Concentration on Texture and Stretch Formability of Rolled Mg-Zn-Gd Alloys at Room Temperature

摘要:

研究了Gd元素对变形Mg-Zn-Gd合金织构和室温成形性能的影响。结果表明：Gd元素可以有效地控制轧制Mg-Zn-Gd合金的基面织构，当0.2%Gd元素加入Mg-1.5Zn合金中，热轧退火后合金的基面织构强度最大值仅为2.3，并且基面织构沿着TD方向发生明显分裂，埃里克森杯突值为7.0，TD方向上延伸率达到29.1%；随着合金中Gd含量的增加，Mg-1.5Zn-2.0Gd合金的基面织构强度最大值有所增加，基面织构沿着TD方向发生分裂的程度明显降低，埃里克森杯突值仅为3.9，并且合金中形成粗大的第二相，导致室温成形性能明显减低

Abstract:

The influence of Gd concentration on texture and stretch formability of rolled Mg-Zn-Gd alloys were investigated. The result shows that Gd addition in Mg-Zn alloys can effectively modify the basal plane texture. The alloy with 0.2% Gd concentration appears to be low texture intensity, TD-split texture occurs when the position of basal is titled from ND toward TD, and the largest Erichsen value is 6.5 while the elongation rate reaches 29.1% in TD direction. However with Gd concentration increasing, when the Gd concentration is 2.0%, the texture intensity increases slightly, TD-split texture degree decreases dramatically, and Erichsen value is only 3.9. Excessive Gd addition promotes formation of the coarse second phase particles, resulting in the deterioration of stretch formability