多数枚重ねの繰り返し重ね接合圧延法による工業用純アルミニウムの結晶粒超微細化

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タイトル別名
  • Ultra Grain Refinement of Commercial Purity Aluminum by a Multi-Stack ARB Process
  • タスウ マイ カサネ ノ クリカエシ カサネ セツゴウ アツエンホウ ニ ヨル コウギョウヨウ ジュンアルミニウム ノ ケッショウリュウ チョウビサイカ

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Multi-layer stack accumulative roll bonding (ARB) process is suggested and applied to commercial purity aluminum for ultra grain refinement. The six aluminum sheets 0.5 mm thick, 50 mm wide and 400 mm long were stacked to each other after degreasing and wire brushing, and then cold-rolled by 50% reduction. The roll-bonded sheet was subsequently rolled by four passes so that the thickness would be 0.5 mm. The sheet was then cut to the six pieces of same length and processed by the same procedure. The ARB process up to six cycles (an equivalent thickness strain of 13.2) was successfully performed. The tensile strength of the ARB processed aluminum increases with the number of ARB cycles, and it reaches a maximum of 287 MPa at the third cycle. The tensile strength is lower in six-layer stack ARB than that in two-layer stack ARB. The elongation slightly decreases with the number of the ARB cycles. TEM observation revealed that the ultrafine grains begin to develop at the first cycle, and after the 3rd cycle almost whole regions are covered with them, and the aspect ratio of them reduces at the 6th cycle. The grain size of the 6-layer stacked ARB is larger than that of 2-layer stacked ARB. The differences with the number of the layers in stacking are explained by the redundant shear deformation. It is concluded that the multi-layer stacked ARB is a suitable process for the industrial production of ultrafine grained coils.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 66 (5), 470-475, 2002

    公益社団法人 日本金属学会

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