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一种新型 Al-2.5GNPs 细化剂制备及其对AZ31 镁合金的细化作用
Preparation of a Novel Al-2.5GNPs Refiner and its RefiningEffect on AZ31 Magnesium Alloy
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- DOI:
- 作者:
- 姚春旭 1，白 玉 1，2， 范文学 2，周欢欢 1，郝 海 1，2
YAO Chunxu1, BAI Yu1,2, FAN Wenxue2, ZHOU Huanhuan1, HAO Hai1,2
- 作者单位:
- 1. 大连理工大学 材料科学与工程学院 凝固控制与数字化制备技术辽宁省重点实验室，辽宁 大连 116024；2. 大连理工大学 宁波研究院，浙江 宁波 315032
1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of MaterialsScience and Engineering, Dalian University of Technology, Dalian 116024, China; 2. Ningbo Institute of Dalian University ofTechnology, Ningbo 315032, China
- 关键词:
- 石墨烯纳米片；球磨工艺；粉末冶金法；AZ31 镁合金；晶粒细化
graphene nanosheets; ball milling process; powder metallurgy method; AZ31 magnesium alloy; grainrefinement
- 摘要:
- 镁合金因自身强度低和塑性较差限制了其在工业领域的应用，向镁合金中添加晶粒细化剂的方法能够改善其组织并提高材料的强度和塑性，是提升镁合金性能的最有效方法之一。 本文利用球磨工艺结合粉末冶金的方法制备出一种含有 GNPs(石墨烯纳米片)的新型镁合金细化剂。采用拉曼光谱分析法探究了不同球磨参数对 GNPs 的质量影响规律，得出较优球磨工艺参数为：转速 300 r/min、球磨时间 2 h，可以保证球磨后 GNPs 的高质量。 将其混合粉体进行冷压，并在 400 ℃烧结 2 h，得到含有 GNPs 且组织致密、成型良好的 Al-2.5GNPs 细化剂。采用 OM、SEM、XRD、TEM 等表征手段初步分析了细化剂中 Al4C3 和 GNPs 对 AZ31 镁合金中的细化及强化机理。 在 720 ℃下加入质量分数为 1.5%的 Al-2.5GNPs 细化剂， 可以使 AZ31 镁合金的晶粒尺寸从 228.8 μm 细化至 65.6 μm， 抗拉强度从 112.6 MPa 提升至178.2 MPa，伸长率从 8.9%提升至 16.7%，分别提高了 58.3%和 87.6%。The industrial application of magnesium alloys is limited by their low strength and poor plasticity. The additionof grain refiners to magnesium alloys can improve their microstructure, strength and plasticity, which is one of the mosteffective methods for improving their properties. In this paper, a refiner containing GNPs (graphene nanosheets) wasprepared by ball milling and powder metallurgy. Raman spectroscopy was used to preliminarily explore the influenceof different ball milling parameters on the quality of the GNPs, and the relative optimal ball milling parameters were300 r/min and 2 h, which ensured the high quality of the GNPs after ball milling. The composite powder was cold pressedand sintered at 400 ℃×2 h to obtain a well-formed Al-2.5GNPs refiner containing a GNP phase with a dense structure. Thebinding situation of the mixed powder and the refinement and strengthening mechanism of Al4C3 and the GNPs in theAZ31 magnesium alloy were preliminarily analysed using OM, SEM, XRD and TEM characterization methods. Byadding a 1.5 wt. % Al-2.5GNPs refiner at 720 ℃, the grain size of the AZ31 magnesium alloy decreases from 228.8 μm to65.6 μm, the tensile strength increases from 112.6 MPa to 178.2 MPa, and the elongation increases from 8.9% to 16.7%,increasing by 58.3% and 87.6%, respectively.