TiB2粒子尺寸分布对Al-5Ti-1B晶粒细化效果的影响
Influence of TiB2 Particle Size Distribution on Grain Refinement of Al-5Ti-1B
程颖 1洪涛 2易浩 3张鑫泽 3杜明 2张花蕊 1张虎1
作者信息
- 1. 北京航空航天大学前沿科学技术创新研究院,北京 100083;北京航空航天大学宁波创新研究院,宁波 315800
- 2. 诸城航大新材料技术有限公司,诸城 262200
- 3. 北京航空航天大学前沿科学技术创新研究院,北京 100083
- 折叠
摘要
作为Al-5Ti-1B中起细化作用的主要物相,TiB2的尺寸分布对晶粒细化效果有重要影响.采用外加TiB2的方式来解决传统氟盐法原位生成TiB2时,TiB2相尺寸分布区间宽且难以准确控制和调整的问题,实现了TiB2尺寸可控的Al-5Ti-1B制备,并通过细化试验和模型计算相结合的方式研究了TiB2 尺寸分布对Al-5Ti-1B在纯铝上细化效果的影响.结果表明,在 0.2%的TiB2 添加量和1.5℃/s的冷却速率下,采用中值粒径分别为2.5 μm和1.4 μm的TiB2制备的Al-5Ti-1B在纯铝上的细化效果相应为149.2 μm和137.0 μm,相比于采用氟盐法制备的Al-5Ti-1B进行细化处理时的275.6 μm分别下降了46%和50%.将TiB2尺寸分布向更为细小集中的方向调整将有利于Al-5Ti-1B细化效果的进一步提升.
Abstract
As the main phase contributing to grain refinement in Al-5Ti-1B,the size distribution of TiB2 plays a vital role in determining the grain refining effect.The problems of broad size distribution interval and difficulty to control and adjust particle size distribution existed in the conventional Fluoride method were overcomed by adding ex-situ TiB2 to prepare Al-5Ti-1B with controllable TiB2 size,and the influence of TiB2 particle size distribution on grain refining effect of Al-5Ti-1B on pure Al was investigated by combining refining experiment and model calculation.The results indicate that under the conditions of 0.2%TiB2 addition and a cooling rate of 1.5℃/s,the grain refining effects of Al-5Ti-1B prepared by adding TiB2 with a median particle size of 2.5 μm and 1.4 μm reach 149.2 μm and 137.0 μm,which are reduced by 46%and 50%compared with that obtained from Al-5Ti-1B prepared through conventional fluo-ride method,respectively.It is beneficial for further improving the grain refining effect of Al-5Ti-1B to adjust the size distribution of TiB2 towards a finer and more concentrated direction.
关键词
晶粒细化剂/Al-5Ti-1B/TiB2尺寸分布/细化晶粒/预测模型Key words
Grain Refiner/Al-5Ti-1B/TiB2 Size Distribution/Grain Refining/Prediction Model引用本文复制引用
基金项目
宁波市科技计划资助项目(202003N4175)
北京航空航天大学青年拔尖人才支持计划资助项目(YWF-22-L-1284)
出版年
2024
NETL
NSTL
万方数据