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Microstructure and anisotropy of mechanical properties in ring rolled AZ80-Ag alloy
Journal of Central South University ( IF 4.4 ) Pub Date : 2021-06-21 , DOI: 10.1007/s11771-021-4699-5
Dong-dong Zhang , Chu-ming Liu , Ying-chun Wan , Shu-nong Jiang , Gang Zeng

The microstructure, anisotropy in tensile strength and tensile creep resistance of the ring rolled AZ80-Ag alloy were studied. The ring exhibited higher strength along rolling direction (RD) than transverse direction (TD). The microstructure characterization and texture analysis demonstrated that the tilted basal texture was responsible for the higher tensile performance along RD. Investigations on the creep anisotropy revealed that the samples along RD had lower creep resistance, higher creep strain and higher steady creep rate at 70–80 MPa, compared with that along TD. The nominal creep stress exponent (n) values, 1.13 for RD and 3.86 for TD, indicated that diffusional creep and dislocation climb were the two corresponding creep mechanisms. During creep of the alloy, Mg17Al12 phase discontinuous precipitations were witnessed and their volume fraction enhanced with increasing stress.



中文翻译:

环轧AZ80-Ag合金的显微组织及力学性能各向异性

研究了环轧AZ80-Ag合金的显微组织、拉伸强度各向异性和抗拉伸蠕变性能。环沿轧制方向 (RD) 的强度高于横向 (TD)。微观结构表征和织构分析表明倾斜的基底织构是导致沿 RD 具有更高拉伸性能的原因。蠕变各向异性研究表明,与沿 TD 相比,沿 RD 的样品在 70-80 MPa 时具有更低的蠕变阻力、更高的蠕变应变和更高的稳态蠕变速率。名义蠕变应力指数 ( n ) 值,RD 为 1.13,TD 为 3.86,表明扩散蠕变和位错爬升是两种相应的蠕变机制。在合金蠕变期间,Mg 17 Al观察到12相不连续沉淀,其体积分数随着应力的增加而增加。

更新日期:2021-06-21
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