Grain refinement and superplasticity of pipes processed by high-pressure sliding
Grain refinement and superplasticity of pipes processed by high-pressure sliding
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DOI：
10.1080/02670836.2020.1746538
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发表时间：
2020-04
影响因子：
1.8
通讯作者：
Yongpeng Tang;Koki Matsuda;Y. Takizawa;M. Yumoto;Yoshiharu Otagiri;Z. Horita
中科院分区：
文献类型：
--
作者：
Yongpeng Tang;Koki Matsuda;Y. Takizawa;M. Yumoto;Yoshiharu Otagiri;Z. Horita
采用高压滑动（HPS）工艺对Al-3wt%Mg-0.2wt%Sc合金管材进行了晶粒细化处理，研究了砧座滑动和芯棒滑动两种变形方式。为了在管的整个横截面上实现均匀的微观结构，每次滑动操作后，通过引入多道次技术（称为多道次HPS（MP-HPS），如先前针对棒开发的）使样品围绕纵向轴线旋转。MP-HPS处理的样品在使用砧滑动和心轴滑动的HPS处理后显示出平均晶粒尺寸为1.260和1.300 nm的超细晶粒结构。样品也表现出超塑性，总延伸率分别超过400%。采用有限元方法模拟了热塑性成形过程中的应变演化过程，模拟结果与实验结果吻合较好。
The high-pressure sliding (HPS) process was applied for grain refinement of a pipe form of an Al-3wt%Mg-0.2wt%Sc alloy by developing two types of straining techniques (called in this study anvil sliding and mandrel sliding). To achieve a homogeneous microstructure throughout the cross-section of the pipe, the sample is rotated around the longitudinal axis every after sliding operation by introducing multi-pass technique, named multi-pass HPS (MP-HPS) as developed earlier for rods. The MP-HPS-processed sample shows ultrafine-grained structures with an average grain size of ∼260 and ∼300 nm after the HPS processing using anvil sliding and mandrel sliding. The samples also exhibit superplasticity with total elongations well more than 400%, respectively. A finite-element method is used to simulate the evolution of strain in the HPS processing and demonstrates that the simulation well represents the experimental results.