轧制变形对高熵合金微观组织和力学性能的影响

对(FeNi)₆₇Cr₁₅Mn₁₀Al₅Ti₃高熵合金进行退火、冷轧和热轧+冷轧等工艺处理,采用X射线衍射仪、扫描电镜和万能试验机分别对合金进行物相组成、组织形貌以及力学性能测试和表征。结果表明,铸态和退火态的非等主元(FeNi)₆₇Cr₁₅Mn₁₀Al₅Ti₃高熵合金更易形成单相固溶体;在中等变形的热轧+冷轧工艺下,合金形成FCC+BCC的双相固溶体,其屈服强度可提高到460.0 MPa;在中等变形的冷轧工艺下,合金会形成细小的金属间化合物,从而具有细小金属间化合物强化机制,使屈服强度显著提升并达到722.0 MPa,同时,合金仍具有约25.7%的均匀伸长率,综合力学性能最佳。

Effect of rolling deformation on microstructure and mechanical properties of high-entropy alloy

Annealing, cold rolling and hot rolling+cold rolling were carried out on (FeNi)₆₇Cr₁₅Mn₁₀Al₅Ti₃ high-entropy alloy. The phase composition, morphology and mechanical of the alloy were analyzed by means of X-ray diffractometer, SEM and universal testing machine. The results show that the as-cast and annealed (FeNi)₆₇Cr₁₅Mn₁₀Al₅Ti₃ high-entropy alloy is easier to form single-phase solid solution. The two-phase solid solution alloy with FCC+BCC structure is formed under the hot rolling+cold rolling with medium deformation, and its yield strength can be increased to 460.0 MPa. The fine intermetallic compound is formed under cold rolling with medium deformation, resulting in fine intermetallic compound strengthening. The yield strength of the cold rolled alloy is significantly increased to 722.0 MPa with elongation of 25.7%, which is of the best comprehensive mechanical properties.