High Energy Milling and Hot Extrusion of Equiatomic NiTi Shape Memory Alloy
In this work a 50Ni50Ti at % powder mixture, commercially pure, prepared by mechanical alloying in an attritor with the following conditions: the milling speed and the ball charge were 1500 rpm and 15:1 respectively. The milling time was 1h under a nitrogen atmosphere at room temperature. After milling it was determined the particles size distribution, the phases by Xray diffractions (XRD) and the powder morphology by scanning electron microscopy (SEM). The powders after milling were compacted and hot extruded at 600 °C with an extrusion ratio of 3 to 1 and characterized by evaluation the density and microstructural determination by optical microscopy. The obtained results are discussed to show that this route could be an alternative route to prepare the shape memory alloy.
Pietro VINCENZINI and Stefano BESSEGHINI
M. do C. Silva et al., "High Energy Milling and Hot Extrusion of Equiatomic NiTi Shape Memory Alloy", Advances in Science and Technology, Vol. 59, pp. 18-23, 2008