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利用X射线衍射仪、扫描电镜、电子背散射衍射、透射电镜以及拉伸实验,研究了FCC结构Al_(0.3)CoCrFeNi高熵合金经90%压下量轧制及退火后的组织和力学性能。结果表明:经轧制及退火(600~1000℃)后,合金发生再结晶,富集Al、Ni原子的有序BCC相优先形成于再结晶FCC相的晶界处,且其体积分数随着退火温度上升先增大后减小。轧制显著强化该合金,随后600℃退火可实现不牺牲均匀塑性而进一步强化该合金的目的,升高退火温度则引起该合金强度下降,塑性增大。经800℃退火后合金表现出较为理想的强度-塑性匹配,其均匀伸长率为34.1%,且抗拉强度可高达935MPa,约是铸态合金(303MPa)的3倍,这主要归结于再结晶组织细化及有序BCC相的析出强化。
The microstructure and mechanical properties of FCC structure Al 0.3 CoCrFeNi high entropy alloy after 90% reduction rolling and annealing were studied by X-ray diffraction, scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy and tensile test. The results show that the alloy recrystallizes after rolling and annealing (600 ~ 1000 ℃). The ordered BCC phase enriched in Al and Ni atoms preferentially forms at the grain boundaries of the recrystallized FCC phase and the volume fraction of Annealing temperature increases first and then decreases. Rolling significantly strengthened the alloy, followed by 600 ° C annealing can be achieved without sacrificing uniform plasticity and further strengthen the purpose of the alloy, raising the annealing temperature causes the alloy strength decreases, plasticity increases. After annealing at 800 ℃, the alloy showed ideal strength-plastic matching with a uniform elongation of 34.1% and a tensile strength of up to 935 MPa, which is about three times that of the as-cast alloy (303 MPa), mainly due to Crystallization and Refinement of Ordered BCC Phase.