Al含量对热轧FeMnCoCr系高熵合金组织和性能的影响

Effect of Al content on microstructure and properties of hot rolled FeMnCoCr high entropy alloy

研究了Al含量对(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(100-x)Al_(x)高熵合金微观组织、变形机制和拉伸性能的影响。采用真空电弧熔炼炉制备合金铸锭,对合金进行压下率为80%的热轧火淬,利用SEM和EBSD对合金的组织结构进行了分析。结果表明,随着Al含量(原子分数,下同)由0%增加到6%,热轧淬火后合金组织由FCC+HCP双相转变成FCC单相,Al含量为8%时产生了BCC相;随着Al含量由0%增加到6%,在拉伸过程中TRIP效应受到抑制,TWIP效应明显增加,合金的屈服强度变化不大,抗拉强度稍有降低,断后伸长率显著增加,当Al含量为6%时断后伸长率达到最高,为79%。

Effect of Al content on microstructure, deformation mechanism and tensile properties of the(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(100-x)Al_(x)high entropy alloys was studied. The(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(100-x)Al_(x)cast alloys were melted by a vacuum electric arc furnace, and then hot rolled and water quenched with a reduction rate of 80%. The microstructure of the alloy was analyzed by using SEM and EBSD. The results show that with the increase of Al content(atom fraction, the same below) from 0% to 6%, the microstructure of the hot rolled and quenched alloy changes from FCC+HCP dual phase to FCC single phase, and BCC phase occurs when Al content is 8%. With the increase of Al content from 0% to 6%, the TRIP effect is inhibited, but the TWIP effect enhances obviously, the yield strength of the alloy changes a little, the tensile strength decreases slightly, while the elongation after fracture increases significantly. When the Al content is 6%, the elongation of the high entropy alloy reaches the highest, which is 79%.