秦绪伟,王守武,陈玉华,等.退火对Al0.1CoCrFeNi高熵合金微观组织及力学性能的影响[J].精密成形工程,2024,16(11):151-159.
QIN Xuwei,WANG Shouwu,CHEN Yuhua,et al.Effect of Annealing on Microstructure and Mechanical Properties of Al0.1CoCrFeNi High Entropy Alloy[J].Journal of Netshape Forming Engineering,2024,16(11):151-159. |
| 退火对Al0.1CoCrFeNi高熵合金微观组织及力学性能的影响 |
| Effect of Annealing on Microstructure and Mechanical Properties of Al0.1CoCrFeNi High Entropy Alloy |
| 投稿时间：2024-04-17 |
| DOI：10.3969/j.issn.1674-6457.2024.11.018 |
| 中文关键词: 高熵合金 热处理 微观组织 拉伸性能 强化机理 |
| 英文关键词: high entropy alloys heat treatment microstructure tensile properties strengthening mechanism |
| 基金项目:江西省自然科学基金(青年)基金(20224BAB214047);江西省杰出青年基金(20224ACB218005);国家自然科学基金(52165049，52175326) |
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| 中文摘要: |
| 目的 研究再结晶温度附近Al0.1CoCrFeNi高熵合金的微观组织演变，分析高熵合金的强化机制转变。方法 利用拉伸机对材料的拉伸性能进行测试;采用X射线衍射、电子扫描显微镜、电子背散射衍射及透射电镜等分析表征方法，对高熵合金材料的微观组织及断口形貌进行分析。结果 固溶态、轧制态及退火态试样相组成均为单相FCC固溶体结构，退火温度不低于600 ℃的试样通过再结晶形成了具有新随机取向的新晶粒。固溶态试样的晶粒由再结晶晶粒掺杂少量亚晶组成，并形成部分形变孪晶;轧制态试样内部主要由变形组织组成，累积有高密度位错;而随着退火温度的升高，其主要晶粒类型由变形晶粒转变为再结晶晶粒，试样内位错密度大幅度降低，并伴随有退火孪晶的形成。不同热处理工艺下的高熵合金试样均具有良好的拉伸性能，其中低于再结晶温度的热处理试样表现出高强度低塑性的特征，屈服强度及抗拉强度分别最高可达到1 290 MPa和1 415 MPa，且700 ℃-1 h试样同时具有825 MPa的抗拉强度与44.58%的断裂延伸率，表现出良好的强塑性匹配性能。轧制态试样、500 ℃-1 h试样和600 ℃-1 h试样的拉伸断口表现为以韧性断裂为主的混合断裂，700 ℃-1 h试样的拉伸断口表现为良好的韧性断裂形貌。结论 退火温度高于600 ℃、退火时间为1 h的退火工艺参数将使材料强化机制由以变形强化为主转变为以细晶强化为主，强度降低塑性提高，强塑性匹配关系更加良好。 |
| 英文摘要: |
| The work aims to study the evolution of microstructure of Al0.1CoCrFeNi high entropy alloy around recrystallisation temperature and analyze the transformation of strengthening mechanism of high entropy alloy. The tensile properties of the materials were tested by tensile machine. The microstructure and fracture morphology of the high entropy alloy materials were analyzed by X-ray diffraction, electron scanning microscopy, electron backscattering diffraction and transmission electron microscopy. The phase composition of the solid-solution, rolled and annealed specimens consisted of a single-phase FCC solid-solution structure. The specimen with the annealing temperature of not less than 600 ℃ formed a new random orientation of the new grains through the recrystallisation. The grains in the solid-solution state were composed of recrystallised grains mixed with a small amount of subcrystals, and some deformation twins were formed. In the rolled state, the specimens were mainly composed of deformation tissues, with accumulated high density of dislocations. With the increase of the annealing temperature, the composition of the grains was transformed from deformation grains to recrystallised grains, and the density of dislocations in the specimens was greatly reduced, accompanied by the formation of annealing twins. The high entropy alloy specimens under different heat treatment processes had good tensile properties, in which the heat treatment specimens below the recrystallisation temperature showed the characteristics of high strength and low plasticity, and the yield strength and tensile strength could reach up to 1 290 MPa and 1 415 MPa, respectively, and the 700 ℃-1 h specimens also had a tensile strength of 825 MPa and a fracture elongation of 44.58%, which showed good strong plasticity matching performance. The tensile fracture of the rolled specimen, 500 ℃-1 h specimen and 600 ℃-1 h specimen showed a mixed fracture dominated by ductile fracture, and the tensile fracture of the 700 ℃-1 h specimen showed a good ductile fracture pattern. The annealing process parameters with annealing temperature higher than 600 ℃ and annealing time of 1 h will make the material strengthening mechanism from the deformation-based strengthening to the fine-grained strengthening, lower the strength, increase the plasticity increase and provide a more favorable strength-plasticity matching relationship. |
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