蒋理帅祎,王凯生,方敏,等.多道次喷涂对AZ80镁合金基体组织状态的影响[J].精密成形工程,2023,15(4):25-32.
JIANG Li-shuai-yi,WANG Kai-sheng,FANG Min,et al.Effects of Multi Pass Spraying on Microstructure State of AZ80 Magnesium Alloy Matrix[J].Journal of Netshape Forming Engineering,2023,15(4):25-32. |
| 多道次喷涂对AZ80镁合金基体组织状态的影响 |
| Effects of Multi Pass Spraying on Microstructure State of AZ80 Magnesium Alloy Matrix |
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| DOI：10.3969/j.issn.1674-6457.2023.04.003 |
| 中文关键词: 超音速火焰喷涂 AZ80 晶粒尺寸 织构状态 再结晶 |
| 英文关键词: supersonic flame spraying AZ80 grain size texture state recrystallization |
| 基金项目:山西省自然科学基金(201901D111167) |
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| 摘要点击次数: 1725 |
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| 中文摘要: |
| 目的 为探究超音速火焰喷涂的高温高速射流对镁合金基体的影响，以形变后镁合金表面纯铜涂层的制备过程为研究对象，研究喷涂过程中镁合金基体的微观组织演化机理。方法 采用超音速火焰喷涂(HVAF)工艺在挤压态AZ80镁合金试样表面制备纯铜涂层，对不同喷涂道次下获得的试样进行微观组织观察与显微硬度测试，结合EBSD分析涂层结合面附近基体的晶粒尺寸分布、再结晶状态及织构取向等。结果 在高温高速射流作用下，涂层结合面附近的基体发生再结晶，平均晶粒尺寸由50 μm细化至15.2 μm;随着喷涂道次的增加，β相逐渐回溶，孪晶消失，基体硬度先降低至70HV0.2后恢复到80HV0.2，织构强度逐渐减小至10.042。结论 多道次超音速火焰喷涂过程中，由于第二相回溶与再结晶的共同作用，镁合金基体硬度呈现出先降低再升高的趋势;再结晶晶粒以晶界弓出形核与亚晶转变共同形成，并在涂层压应力作用下选择性偏转与长大，逐渐吞并原始变形晶粒;与此同时，亚晶界逐渐转变为大角度晶界，晶粒被再次细化，最终导致涂层结合面处基体产生明显的择优取向。 |
| 英文摘要: |
| The work aims to take preparation process of pure copper coating on the deformed magnesium alloy surface as the research object to study the microstructure evolution mechanism of the magnesium alloy matrix during spraying to investigate the effects of high temperature and high speed jet of supersonic flame spraying on the magnesium alloy matrix. The pure copper coating was prepared on the surface of extruded AZ80 magnesium alloy samples by HVAF process. The samples obtained under different spraying passes were observed for microstructure and microhardness tests. The grain size distribution, recrystallization state and texture orientation of matrix near the coating interface were analyzed with EBSD. The matrix near the coating interface was recrystallized under the action of high temperature and high speed jet, and the average grain size was refined from 50 μm to 15.2 μm; As the number of spraying passes increased, the β phase gradually dissolved, the twins disappeared, the hardness of the matrix first decreased to 70HV0.2 and then recovered to 80HV0.2, and the texture strength gradually decreased to 10.042. During multi pass supersonic flame spraying, the hardness of the magnesium alloy matrix decreases first and then increases due to the combined effect of secondary phase dissolution and recrystallization. Recrystallized grains are formed together by grain boundary bow out nucleation and sub crystal transformation, rotate and grow selectively under the action of compressive stress of coating, and gradually swallow the original deformed grains. At the same time, the low angle grain boundaries are gradually transformed into high angle grain boundaries, and the grains are refined again, resulting in an obvious preferred orientation of the matrix at the coating interface. |
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