郭亿,王金凤,苏文超,等.机械合金化结合真空热压烧结技术制备Al1.5CoCrFeNiMo0.4高熵合金[J].精密成形工程,2025,17(5):102-112.
GUO Yi,WANG Jinfeng,SU Wenchao,et al.Preparation of Al1.5CoCrFeNiMo0.4 High Entropy Alloy by Mechanical Alloying Combined with Vacuum Hot Pressing Sintering Technology[J].Journal of Netshape Forming Engineering,2025,17(5):102-112. |
| 机械合金化结合真空热压烧结技术制备Al1.5CoCrFeNiMo0.4高熵合金 |
| Preparation of Al1.5CoCrFeNiMo0.4 High Entropy Alloy by Mechanical Alloying Combined with Vacuum Hot Pressing Sintering Technology |
| 投稿时间：2024-09-14 |
| DOI：10.3969/j.issn.1674-6457.2025.05.012 |
| 中文关键词: 高熵合金 机械合金化(MA) 真空热压烧结(VHP) 晶粒尺寸 烧结温度 |
| 英文关键词: high entropy alloy mechanical alloying (MA) vacuum hot press sintering (VHP) grain size sintering temperature |
| 基金项目:先进焊接与连接国家重点实验室开放课题基金(AWJ-23M25) |
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| 中文摘要: |
| 目的 为制备适用于多孔轴承的Al1.5CoCrFeNiMo0.4高熵合金块体，以金属单质粉末为原材料，研究球磨时间对合金粉体相含量、晶粒尺寸及微观形貌的影响;并探讨不同烧结温度下高熵合金块体力学性能的变化规律。方法 通过机械合金化(MA)法制备出Al1.5CoCrFeNiMo0.4高熵合金粉体，并选择性能最优的粉体进行真空热压烧结(VHP)以制备Al1.5CoCrFeNiMo0.4高熵合金块体。结果 合金粉末在球磨的作用下逐渐合金化，形成了2个BCC相、1个FCC相;平均晶粒尺寸也由15 nm降低至11 nm，最终在40 h时合金粉体中各相的含量保持不变，形成较为稳定的固溶体结构。根据计算出的高熵合金粉体熔点，选择1 150、1 200、1 250 ℃ 3个烧结温度制备高熵合金块体。随着烧结温度的升高，合金块体的致密度逐渐上升，由85.2%提升至96.8%;压缩性能迅速提高，抗压强度由621 MPa提升至1 062 MPa;硬度略有下降，由877.2HV下降至837.2HV;摩擦因数由0.55下降至0.47，磨损质量由12.8 mg下降至3.5 mg。结论 当粉体球磨至40 h时，合金粉体平均晶粒尺寸为11.3 nm且粉体中相含量保持不变，合金化程度最好;当烧结温度为1 250 ℃时，合金硬度为837.2HV，抗压强度为1 062 MPa，摩擦因数为0.55，磨损质量为3.5 mg，此时块体试样综合性能最优。 |
| 英文摘要: |
| The work aims to study the effects of ball milling time on the phase content, grain size and microstructure of the alloy powder with metal elemental powder as raw material, and discuss the variation of mechanical properties of high entropy alloy blocks at different sintering temperature, so as to prepare Al1.5CoCrFeNiMo0.4 high-entropy alloy block suitable for porous bearings. Al1.5CoCrFeNiMo0.4 high-entropy alloy powder was prepared by mechanical alloying (MA) method, and the powder with the best performance was selected for vacuum hot pressing sintering (VHP) to prepare Al1.5CoCrFeNiMo0.4 high-entropy alloy block. It was found that the alloy powder was gradually alloyed under the action of ball milling, forming two BCC phases and one FCC phase. The average grain size was also reduced from 15 nm to 11 nm. Finally, the content of each phase in the alloy powder remained unchanged at 40 h, forming a relatively stable solid solution structure. According to the calculated melting point of high-entropy alloy powder, temperature levels of 1 150, 1 200 and 1 250 ℃ were selected to prepare high-entropy alloy blocks. It was found that with the increase of sintering temperature, the density of the alloy block gradually increased from 85.2% to 96.8%. The compression performance was improved rapidly, and the compressive strength was increased from 621 MPa to 1 062 MPa. The hardness decreased slightly from 877.2HV to 837.2HV; The friction coefficient decreased from 0.55 to 0.47, and the wear mass decreased from 12.8 mg to 3.5 mg. When the powder is milled to 40 h, the average grain size of the alloy powder is 11.3 nm and the phase content in the powder remains unchanged. The alloying degree is the best. At sintering temperature of 1 250 ℃, the hardness is 837.2HV, the compressive strength is 1 062 MPa, the friction coefficient is 0.55, and the wear mass is 3.5 mg. |
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