Very interesting! Also, I found very interesting courses in composites in The Native Lab. These courses are given by experts in the field from the company Managing Composites. Totally recommendable!
Thank you sir 🙏🏾🙏🏾. Kindly continue with next topics of composites, that can help us more. Regards Khan Mubashir Mtech scholar at School of materials and chemical sciences. DIAT DRDO Pune
Спасибо. Очень наглядно и понятно. Один только вопрос - если в роли матрицы будет выступать композитный полимер, выплавленный из LFT-G -гранул (композитные гранулы с длинными волокнами углерода/базальта/стекла), а в него будет добавляться керамический нано-аддитив по типу нитридных или карбидных нановискеров, то это будет гибридный нанокомпозит с несколькими фазами (нано- и макро-фазы)?? Или же это будет полимерно-волоконно-керамический нанокомпозит, как пример GFRP-LFT-G-nSi3N4 (матрица - сплавление в лист гранул LFT-G TPU/RTPU + LGF, а добавляемый наноаддитив - нановискеры нитрида кремния)?
Alloy is usually used for metals. Whenever we mix more than one metals we get an alloy. Examples are Pb-Sn solder alloy or Cu-Zn alpha brass. A composite is not necessarily metallic. So we have GFRP (Glass fibre reinforced plastic). In composite there has to be at least two distinct phases, for example glass and plastic in GFRP. And these tow phases were combined together in the process of producing GFRP. Metal matrix composite are also there, e.g., Al-SiC. Here also Al and SiC were combined together during the processing of the composite. Alloy can be single phase or more than one phase. So alpha brass is single phase. Although it consists of Cu and Zn whoosh share the same FCC lattice forming a substitutional solid solution. So at the microstructure level you will not get different phases like in the case of Al-SiC or GFRP. So single phase alloys are very distinct from composites. Alloy can also have more than one phases. So the Pb-Sn solder has two phases alpha and beta. The alpha phase is FCC whereas the beta phase is BCT. In the optical microscope you can see these two regions distinctly. In X-ray diffraction you will get different peaks from these two phases. Such alloys share this feature of having more than one phases with composite. Thus in this sense sometimes one can call such alloys as composite of these two phases (but not of the elements making the alloy). However they are different from GFRP in the sense that the we only melted Pb and Zn together to get the solder alloy. The alpha and beta phase formed as a result of solidification. We did not combine alpha and beta phases as we combined glass and polymer. If one wishes to emphasise this fact we can call solder alloy as ' composite, meaning that the alpha and beta were not present to begin with but formed during the formation of the alloy. Thus in summary single phase metallic alloys cannot be called composites. Multiphase metallic alloys and opposites both have more than one phases. Multiphase alloys are usually not called composites but you may call them composites or better ' composites.
