90 K superconductivity of clean Pb1212 epitaxial films

Komori, Sachio; Kondo, Akihiro; Kindo, Koichi; Kakeya, Itsuhiro

doi:10.1088/0953-2048/29/8/085007

Cited by 2 publications

(1 citation statement)

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“…Such forming operation includes forward, backward, and combined forward-backward extrusion. The forming defects with the forward or backward extrusion processes, such as Chevron cracks, have been investigated extensively [1][2][3][4][5][6]. However, the investigations on the forming defects with combination extrusion, such as piercing or surface-crack defects, are still scarce.…”

Section: Introductionmentioning

confidence: 99%

Piercing and surface-crack defects in combination extrusion of fasteners

et al. 2017

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Abstract. Piercing or surface-crack defect occurs in combination-extruding the support pin. There has been so far insufficient knowledge in avoiding such forming defects in forming the similar products. In this paper, a combination-extrusion experiment, with various combinations of forward and backward extrusion ratios, was conducted to observe the occurrence of the defects. The result shows that the defects occur at low level of both forward extrusion ratio and backward extrusion ratio used in the combination-extrusion process. The low forming level causes the onset of insufficient plastic metal-flow, which is similar to that of inhomogeneous deformation in the unidirectional extrusion or drawing process. A forming limit diagram was constructed and can be used in the defect prediction for the future development of similar products.

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