Development of High Value Alloys without Critical Raw Materials through High Entropy Alloys
AbstractNiobium (Nb) and Chromium (Cr), being crucial alloying elements in the high value alloys such as the High Strength Low Alloys (HSLA) and Stainless Steels, especially Austenitic Stainless Steels (AUST.SS), have been identified and classified as critical raw materials (CRM). The potential of not producing these high value alloys has an adverse effect on the EU and Turkish economy due to the fact that Nb and Cr. Therefore, it is necessary to develop a new generation of structural alloys that will be free from CRM elements and exhibiting superior performance. However, it is difficult to develop such proposed high performance alloys by conventional alloying, which are formed around a dominant element like iron in the steel. The High Entropy Alloying, an innovative approach introduced in the last decade, is the alloying using the alloying elements at equiatomic or near equiatomic percentage, consequently the presence of the high mixing enthalpy positioned the alloying elements within the same phase crystal lattice system. As alternatives to HSLA and AUST.SS alloys, the novel structural alloys can be designed and developed by means of HEA approach and gain to industries. The purpose of the study is the designing and developing novel structural alloys as an HSLA and AUST.SS) using innovative High Entropy Alloying (HEA) approach. The proposed High Entropy Structural Alloys (HESA) in this project will be manufactured through the conventional melting and thermomechanical processing. The HESA alloy groups, which will have key roles in many important industrial applications, are aimed at exhibiting superior mechanical properties and corrosion values and meeting the industrial and economic conditions of production.