COEP BLOGS

       The chalcolithic period refers to that part of old-world prehistory wedged between Neolithic, and the  urban and literate societies of bronze age. This was the era when the first metal was found and it was nothing else but the copper and there was extensive use of mixture of stone and copper as stone increases strength it had been added to copper.  The term Chalcolithic is a combination of two words- Chalco + Lithic was derived from the Greek words "khalkos" + "líthos" which means "copper" and "stone" or Copper Age. It is  also known as the  Eneolithic or Aneolithic  (from Latin aeneus "of copper") is an    archaeological period that is usually considered to be part of the broader Neolithic (although it was originally defined as a transition between the Neolithic and the Bronze Age). Copper age is associated with wide-spread  Copper Metallurgy. Credits: https://www.alchemyias.com                         In India, it spanned aroun

Introduction First discovered by William J. Buehler with Frederick Wang in 1959 during their research at Naval Ordnance Laboratory. It is an alloy of Nickel and Titanium called Nitinol (NiTi). It is an acronym for Ni-   Nickel,  Ti-Titanium, Nol-Naval Ordnance Laboratory. It has main properties like ‘Super elasticity’ and ‘shape memory’ (due to this property it is also called a Shape memory alloy). Let us go into details of the properties of Nitinol. Why Nitinol is called a shape memory alloy (SMA)? Nitinol is called a shape memory alloy because it regains its predetermined shape when it is heated above a certain temperature generally known as transformation temperature, irrespective of the shape from which it is being transformed. i.e., it actually remembers its shape! This can also be called ‘The shape memory effect’. In simple words if a straight wire is deformed by winding it into a coil, then heating this coil to a certain temperature by placing it into a hot water bath ‘h