Age Hardening of AlCrMoNiTi High Entropy Alloy Prepared by Powder Metallurgy

作者：Ren Bo^*; Ma Jianhui; Zhao Ruifeng; Guan Shaokang; Zhang Hongsong

来源：Rare Metal Materials and Engineering, 2014, 43(6): 1286-1290.

DOI：10.1016/s1875-5372(14)60108-9

• high entropy alloy
• powder metallurgy process
• solid solution
• microstructure
• age hardening

The AlCrMoNiTi high entropy alloy was prepared by powder metallurgy process. Its microstructure and hardness of as-cast and annealed state were studied. The results show that the as-cast alloy exhibits a mixture of the dendrite (Cr, Mo)-rich bcc phase and the interdendrite (Al, Ni, Ti)-rich fcc phase. The aged alloy can obtain a peak hardness HV of 6150 MiPa at 900 degrees C, and then anneal softening occurs at 1000 degrees C, but its hardness HV still maintained at a high level of 5160 MPa. This shows that the AlCrMoNiTi alloy exhibits a good high-temperature age hardening performance. Age hardening of the alloy is mainly attributed to the grain refinement strengthening at 800 degrees C and the precipitation hardening of the second phase (bcc2) at 900 degrees C. The disappeared second phase and grain coarsening are the main reasons for the softening anneal at 1000 degrees C.

• 出版日期2014-6
• 单位郑州大学; 河南工程学院