Search Results - "Höppel, H. W."

Mechanical properties of ultrafine-grained AlZnMg(Cu)-alloys AA7020 and AA7075 processed by accumulative roll bonding by Ruppert, M., Strebl, M., Höppel, H. W., Göken, M.

“…Ultrafine-grained AA7020 (AlZnMg) and AA7075 (AlZnMgCu) were produced by accumulative roll bonding (ARB) with up to 6 cycles. Different pre-heating treatments…”
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Microscale High-Cycle Fatigue Testing by Dynamic Micropillar Compression Using Continuous Stiffness Measurement by Merle, B., Höppel, H. W.

“…The continuous stiffness method (CSM) is used for fatigue testing FIB-fabricated micropillars up to the high cycle fatigue (HCF) range on a commercial…”
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Mechanical properties, dislocation density and grain structure of ultrafine-grained aluminum and aluminum-magnesium alloys by MAY, J, DINKEL, M, AMBERGER, D, HÖPPEL, H. W, GÖKEN, M

“…The kind and amount of alloying elements strongly affects the formation of ultrafine-grained micro structures. Aluminum alloys with different amounts of the…”
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Formation of Peripheral Coarse Grain in Thin-Walled Al–Mg–Si Extrusion Profiles by Goik, P., Schiffl, A., Höppel, H. W.

“…Investigations on microstructure and texture development during processing of Al–Mg–Si sheet and extrusion profiles focused on describing and modelling the…”
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Study of sensitization and different heating cycles on stainless steels used for automotive exhaust components by Yasir, M., Mori, G., Wieser, H., Reller, A., Höppel, H. W.

“…In order to achieve a reasonable lifetime of automotive exhaust components, a large number of high alloyed ferritic and austenitic stainless steels are used…”
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Strain rate sensitivity of ultrafine-grained aluminium processed by severe plastic deformation by May, J., Höppel, H.W., Göken, M.

“…The strain rate sensitivity of commercial purity aluminium (Al 99.5) with conventional and ultrafine (UFG) grain size is investigated by compression tests at…”
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Localized corrosion of ultrafine-grained Al–Mg model alloys by Brunner, J.G., May, J., Höppel, H.W., M.Göken, Virtanen, S.

“…The present study investigates passivity and localized corrosion of ultrafine-grained (UFG) binary Al-alloys with 0.5, 1 and 2 wt.% of magnesium subjected to…”
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Influence of upscaling accumulative roll bonding on the homogeneity and mechanical properties of AA1050A by Ruppert, M., Böhm, W., Nguyen, H., Höppel, H. W., Merklein, M., Göken, M.

“…Accumulative roll bonding (ARB), as a method for production of ultrafine grained materials, is frequently supposed to be easily transferable to established…”
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Effect of Mg content on microstructure, texture and strength of severely equal channel angular pressed aluminium-magnesium alloys by Kalsar, R., Yadav, D., Sharma, A., Brokmeier, H.-G., May, J., Höppel, H.W., Skrotzki, W., Suwas, S.

“…Equal channel angular pressing was carried out on Al–Mg alloys to study the effect of Mg addition on the microstructure, texture and strength after severe…”
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Fatigue and microstructure of ultrafine-grained metals produced by severe plastic deformation by Mughrabi, H, Höppel, H.W, Kautz, M

“…The cyclic deformation and fatigue behaviour of ultrafine-grained metals produced by the severe plastic deformation technique ECAP (equal channel angular…”
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The Innovation Potential of Bulk Nanostructured Materials by Valiev, R. Z., Zehetbauer, M. J., Estrin, Y., Höppel, H. W., Ivanisenko, Y., Hahn, H., Wilde, G., Roven, H. J., Sauvage, X., Langdon, T. G.

“…The innovation potential is high for bulk nanostructured materials (BNM) produced by methods of severe plastic deformation and accordingly this report focuses…”
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Enhanced monotonic and cyclic mechanical properties of ultrafine-grained laminated metal composites with strong and stiff interlayers by Kümmel, F., Diepold, B., Prakash, A., Höppel, H.W., Göken, M.

“…[Display omitted] •Slightly increased monotonic strength but clearly enhanced ductility of the aluminum/steel composite.•Significant enhanced fatigue lives of…”
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Deformation kinetics of nanocrystalline nickel by Li, Y.J., Mueller, J., Höppel, H.W., Göken, M., Blum, W.

“…The work hardening and the strain rate sensitivity of flow stress were studied in the temperature range from 298 to 473 K for nanocrystalline (NC) nickel with…”
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Influence of grain boundaries on the deformation resistance: insights from an investigation of deformation kinetics and microstructure of copper after predeformation by ECAP by Bach, J., Liebig, J.P., Höppel, H.W., Blum, W.

“…The grain structure of coarse-grained Cu of different degrees of purity was modified by plastic deformation by , 4 and 8 passes of equal channel angular…”
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Influence of specimen geometry on temperature increase during ultrasonic fatigue testing by Bach, J., Höppel, H.W., Bitzek, E., Göken, M.

“…•Influence of design on the ultrasonic fatigue behavior was investigated.•Characteristic frequencies depend on design and amplitude.•Specimens with a longer…”
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Monotonic and cyclic deformation behaviour of ultrafine-grained aluminium by May, J., Amberger, D., Dinkel, M., Höppel, H.W., Göken, M.

“…The effect of the enhanced strain-rate sensitivity (SRS) of ultrafine-grained commercially pure aluminium Al 99.5 on the mechanical properties under monotonic…”
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Tailored heat treated accumulative roll bonded aluminum blanks: failure under bending stresses by Nguyen, H., Böhm, W., Tsoupis, I., Göken, M., Höppel, H. W., Schmidt, C., Hausöl, T., Ruppert, M., Merklein, M.

“…Ultrafine-grained accumulative roll bonded (ARB) sheet metals of aluminum alloys have a high potential for lightweight construction. The mechanical properties…”
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Life prediction of thermally highly loaded components: modelling the damage process of a rocket combustion chamber hot wall by Schwarz, W., Schwub, S., Quering, K., Wiedmann, D., Höppel, H. W., Göken, M.

“…During their operational life-time, actively cooled liners of cryogenic combustion chambers are known to exhibit a characteristic so-called doghouse…”
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A multiscale simulation framework of the accumulative roll bonding process accounting for texture evolution by Prakash, A., Nöhring, W.G., Lebensohn, R.A., Höppel, H.W., Bitzek, E.

“…The accumulative roll bonding process is one of the most prominent severe plastic deformation processes for obtaining sheet materials with ultra-fine-grained…”
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A finite element modelling study of strain localization in the vicinity of near-surface cavities as a cause of subsurface fatigue crack initiation by BORBELY, A, MUGHRABI, H, EISENMEIER, G, HÖPPEL, H. W

“…Recently, several observations of subsurface fatigue crack initiation in the vicinity of cavities in cast and in powder metallurgical (PM) alloys have been…”
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