Study on the Ability of Al,Ti,V and Cr to Promote BCC Phase Formation in High Entropy Alloys
The addition amounts of Al,Ti,V and Cr to promote the formation of BCC phase in Co,Fe,Mn,Ni-based high entropy alloys were quantitatively studied,and the relevant rules are analyzed with the periodic table of elements.The Co,Fe,Mn,Ni-based high entropy alloy was melted via vacuum melting furnace.The micro structure and hardness of the alloys were analyzed by scanning electron microscope,X-ray diffractometer and microhardness tester.It is shown that the Co,Fe,Mn,Ni-based alloy has a single FCC phase structure.The addition amounts of Al,Ti,V and Cr separately to the alloy for BCC phase formation are 0.6 mole,0.6 mole,1 mole and 2 moles,respectively.The order of ability to promote BCC phase formation is Al＞Ti＞V＞Cr.For the transition group elements of the fourth period of the periodic table,the elements with serial number less than 25 are BCC forming elements,and the smaller the serial number,the more conducive to the formation of BCC phase in high-entropy alloys.When the BCC phase is formed,the hardness of the alloy increases.Both the microhardness and brittleness of the alloy increase with the increase of BCC phase.After the alloy contains 2 moles of titanium,the corrosion resistance of the alloy is significantly improved.and there is still no obvious corrosion trace even after 120 s of aqua regia corrosion.
high entropy alloyFCC phaseBCC phasemicrohardnessvacuum refining
NETL
NSTL
万方数据
维普
