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Query: UMLS:C0276640 (TEM)
 20,729 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The evolution of nano-grains in oxygen free copper with accumulative roll-bonding is investigated by TEM and EBSD analysis. The ultrafine grains developed in the sample after 8-cycle ARB. It was found that the mean spacing of grain boundaries, which was 63 microm in initial material, reduced to 5.5 microm after 1 cycle, then surprisingly 450 nm after 3 cycles. In addition, the fraction of high-angle boundaries in the sample after 1-cycle ARB was 0.32, but it after 3-cycle ARB was surprisingly more than 0.6. Texture development of the ARB processed samples is different depending on the number of ARB cycles.
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PMID:Evolution of nano-grains in high purity copper by accumulative roll-bonding process. 2035 63

An ultrafine grain (UFG) complex lamella aluminum alloy sheet was successfully fabricated by ARB process using AA1050 and AA6061. The lamella thickness of the alloy became thinner and elongated to the rolling direction with increasing the number of ARB cycles. By TEM observation, it is revealed that the aspect ratio of UFGs formed by ARB became smaller with increasing the number of ARB cycles. In addition, the effect of ARB process on the development of deformation texture at the quarter thickness of ARB-processed sheets was clarified. ARB process leaded to the formation of the rolling texture with shear texture and weak cube orientation. The subdivision of the grains to the rolling direction began to occur after 3 cycles of the ARB, resulting in formation of ultrafine grains with small aspect ratio. After 5 cycles, the ultrafine grained structure with the average grain diameter of 560 nm develops in almost whole regions of the sample.
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PMID:Microstructure and texture of a nano-grained complex Al alloy fabricated by accumulative roll-bonding of dissimilar Al alloys. 2364 63