Compression properties enhancement of Al-Cu alloy solidified under a 29 T high static magnetic field
Compression properties enhancement of Al-Cu alloy solidified under a 29 T high static magnetic field
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29T高静磁场凝固Al-Cu合金压缩性能的增强
DOI：
10.1016/j.msea.2018.07.013
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发表时间：
2018
期刊：
影响因子：
6.4
通讯作者：
Beaugnon Eric
中科院分区：
文献类型：
--
作者：
Zheng Tianxiang;Zhou Bangfei;Wang Jiang;Shuai Sansan;Zhong Yunbo;Ren Weili;Ren Zhongming;Debray Francois;Beaugnon Eric
研究了强磁场作用下Al-40wt%Cu过氧化氢合金的块体凝固过程。结果表明，通过施加29 T的HSMF，在糊状区和整个尺度上的熔体对流被完全抑制。Al 2Cu析出相的生长促进了初生Al 2Cu小面相向非小面相的转变。在0 T下，Al-Al 2Cu共晶失稳为片状和棒状α-Al相共存，而在29 T下，共晶稳定为片状。初生Al_2Cu相尺寸得到细化。共晶Al-Al 2Cu组织的层间距从6.3 μm减小到2-3 μm。初生Al_2Cu析出相几乎沿其< 001 >晶向取向，且与垂直HSMF方向平行。收缩的形貌表现为近似规则的球形。Al-40 wt% Cu合金的抗压强度从248 MPa提高到431 MPa，最大应变从3.6%提高到5%。本文揭示了高速电磁搅拌对Al_2Cu析出相的影响，为细化理论提供了新的视角，为制备具有优异力学性能的脆性材料提供了新的途径。
Bulk solidification of Al-40 wt% Cu hypereutectic alloy has been investigated using a high static magnetic field (HSMF). The results show that, by imposing a 29 T HSMF, the melt convection has been completely suppressed in the mushy zone and the whole scale. The primary Al2Cu faceted phase changed to non-faceted phase because of the growth enhancement of Al2Cu precipitates. Al-Al2Cu eutectic was destabilized as a coexisting of lamellar and rod-like α-Al phase under 0 T whereas it was stabilized as a lamellae under the 29 T HSMF. The dimension of primary Al2Cu precipitates has been refined. The interlamellar spacing of eutectic Al-Al2Cu structure has been reduced from 6.3 µm to 2–3 µm. The primary Al2Cu precipitates were almost oriented to its < 001 > crystal direction which was parallel to the direction of the vertical HSMF. The morphologies of shrinkages displays as approximately regular spheres. Compressive strength of Al-40 wt% Cu alloy has been enhanced from 248 MPa to 431 MPa and the maximum stain has been improved from 3.6% to 5%. This paper reveals the effect of HSMF on Al2Cu precipitates, provides a new sight about refinement theory and new pathway to fabricate brittle materials with excellent mechanical properties.