AlCoCrFeMn high-entropy alloy with non-equal atomic ratio and preparation method of AlCoCrFeMn high-entropy alloy

Abstract

The invention discloses an AlCoCrFeMn high-entropy alloy with a non-equal atomic ratio and a preparation method of the AlCoCrFeMn high-entropy alloy. The atomic ratio of all elements of Al to Co to Crto Fe to Mn in the high-entropy alloy is equal to (0.3-0.7): to 2 to 1 to 1 to 1. The preparation method comprises the following steps that (1) a raw material is taken in proportion, and cleaning anddrying are conducted; (2) the raw material is put into a non-consumable arc melting furnace, vacuumizing is conducted and protective gas is added; (3) Ti which is arranged in the furnace in advance is firstly smelted, then the raw material is smelted, and suction casting is conducted by using a copper mold to form an alloy ingot; (4) the alloy ingot is subjected to solid solution, water quenchingand rolling deformation; and (5) the deformed alloy ingot is annealed to obtain the AlCoCrFeMn high-entropy alloy with the unequal atomic ratio. According to the AlCoCrFeMn high-entropy alloy with the non-equal atomic ratio and the preparation method of the AlCoCrFeMn high-entropy alloy, by adding a certain amount of Co element, the strength of the high-entropy alloy is improved, the content of the Co element is increased, and the alloy has good thermal stability; and the plasticity of the high-entropy alloy is adjusted by adding a certain amount of Al element, and the prepared high-entropy alloy has good strength and plasticity.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a non-equiatomic ratio AlCoCrFeMn high-entropy alloy and a preparation method thereof. Background technique [0002] For a long time, the design of metal materials has been to use one element or two elements as the main element of the alloy, and then add one or more trace elements to modify a certain property. In 2004, Brain Cantor and other scholars successfully designed six alloys of FeCrMnNiCo, FeCrMnNiCoNb, FeCrMnNiCoGe, FeCrMnNiCoCu, FeCrMnNiCoTi and FeCrMnNiCoV based on the concept of equiatomic ratio multi-component alloys, and found that these alloys did not produce complex structural phases, but instead formed by face-centered cubic (FCC) or face-centered cubic plus body-centered cubic (BCC) simple structures. In the same year, Professor Ye Junwei of Tsinghua University in Taiwan and other scholars proposed a new alloy design concept, named this type of alloy as...

AI Technical Summary

Problems solved by technology

The main reason is that most of the current high-entropy alloys do not have outstanding performance advantages compared with traditional alloys, and it is difficult to balance the contradiction between plasticity and strength. High-entropy alloys with FCC solid solution structure have higher tensile elongation. But the strength is low, while the high-entropy alloy with BCC solid solution structure has high strength but low elongation when stretched

On the other hand, the composition design of most high-entropy alloys is limited to equiatomic ratios, which limits the expansion of the composition range of high-entropy alloys.