工艺参数对触变模锻6061 Al合金微观组织与力学性能的影响（英文）

发布时间：2018-05-11 01:16

本文选题：铝合金 + 半固态粉末触变模锻　；参考：《Transactions of Nonferrous Metals Society of China》2015年03期

【摘要】：提出一种制备颗粒增强金属基复合材料的新技术—粉末触变成形,并利用该技术对基体6061铝合金进行触变模锻。首先,将雾化的6061合金粉末冷压成块,压出的块体作为初始锭料,经部分重熔后再进行触变模锻。研究重熔时间、模具温度和重熔温度对触变模锻6061合金微观组织与力学性能的影响。结果表明,这3个加工工艺参数对微观组织与力学性能均有较大影响;合金的断裂机理是由不同加工工艺参数下的微观组织决定的;此外,裂纹往往起源于缩松和夹杂处,沿着二次凝固组织或者初生相颗粒扩展;经触变模锻得到的合金的抗拉强度、伸长率和硬度分别可达196 MPa、11.0%和HV 55.7。
[Abstract]:A new technology for preparing particle reinforced metal matrix composites, powder thixoforming, is proposed, and thixotropic die forging of 6061 aluminum alloy matrix is carried out. Firstly, the atomized 6061 alloy powder was chilled into blocks, the extruded block was used as the initial ingot, and then thixotropic die forging was carried out after partial remelting. The effects of remelting time, die temperature and remelting temperature on microstructure and mechanical properties of 6061 alloy were studied. The results show that the three processing parameters have a great influence on the microstructure and mechanical properties of the alloy, the fracture mechanism of the alloy is determined by the microstructure of the alloy under different processing parameters, and the cracks often originate in the place of shrinkage, porosity and inclusions. The tensile strength, elongation and hardness of the alloy obtained by thixotropic die forging are up to 11.0% and 55.7%, respectively, along the secondary solidified microstructure or primary phase particles, and the tensile strength, elongation and hardness of the alloy obtained by thixotropic die forging are up to 11.0% and 55.7%, respectively.
【作者单位】：兰州理工大学有色金属先进加工与再利用国家重点实验室;
【基金】：Project(2014-07)supported by the Basic Scientific Fund of Gansu University,China Project(NCET-10-0023)supported by the Program for New Century Excellent Talents in University of China Project supported by the Program for Hongliu Outstanding Talents of Lanzhou University of Technology,China
【分类号】：TG319

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