| 引用本文: | 郭路,闫敬明,左孝青,易健宏,周芸,苗琪.高能球磨及热挤压对Al-Ti-B细化剂纳米TiB2颗粒分散性与细化性能的影响[J].材料科学与工艺,2023,31(2):15-23.DOI:10.11951/j.issn.1005-0299.20220044. |
| GUO Lu,YAN Jingming,ZUO Xiaoqing,YI Jianhong,ZHOU Yun,MIAO Qi.Effect of high-energy ball milling and hot extrusion on TiB2 nanoparticle dispersion and grain refinement property of Al-Ti-B refiner[J].Materials Science and Technology,2023,31(2):15-23.DOI:10.11951/j.issn.1005-0299.20220044. |
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| 摘要: |
| 为获得高晶粒细化性能的Al-Ti-B细化剂,本文利用高能球磨法在微米Ti粉上负载纳米TiB2颗粒制备了Ti/TiB2粉末细化剂,并采用热挤压工艺制备了杆状Al-Ti-B细化剂,对比分析了两种细化剂的晶粒细化性能及机理。研究表明:高能球磨可将纳米TiB2颗粒均匀负载分散在微米Ti粉表面,使工业纯铝的平均晶粒尺寸细化至74.6 μm；热挤压则使细化剂致密化,微米Ti粉及纳米TiB2颗粒在铝基体中分布更加均匀,可将工业纯铝的平均晶粒尺寸进一步细化至58.4 μm,获得最佳细化效果,并使细化剂的抗衰退性能提高。机理分析表明,随着细化剂中纳米TiB2颗粒的分散性提高、团聚现象减缓,其在铝熔体中的沉降速度缓慢,对晶粒的形核促进作用、长大抑制作用更充分,是热挤压Al-Ti-B细化剂对工业纯铝有优异晶粒细化效果的关键。 |
| 关键词: Al-Ti-B细化剂 高能球磨 热挤压 纳米TiB2颗粒分散性 晶粒细化 |
| DOI：10.11951/j.issn.1005-0299.20220044 |
| 分类号:TG146 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目( 51861020, 51741103) ; 云南省重点研发计划项目( 2018BA072). |
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| Effect of high-energy ball milling and hot extrusion on TiB2 nanoparticle dispersion and grain refinement property of Al-Ti-B refiner |
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GUO Lu,YAN Jingming,ZUO Xiaoqing,YI Jianhong,ZHOU Yun,MIAO Qi
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(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
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| Abstract: |
| To obtain Al-Ti-B refiner with good grain refinement property,Ti/TiB2 powder refiner was prepared by loading TiB2 nanoparticles (NPs) on micron Ti powder via high-energy ball milling (HEBM), and rod-like Al-Ti-B refiner was prepared by hot extrusion. The grain refinement properties and mechanisms of the two refiners were compared and analyzed. Results show that TiB2 NPs were evenly dispersed on the micron Ti powder by HEBM,and the average grain size (AGS) of commercial pure aluminum (CPAl) was 74.6 μm after refinement. Through hot extrusion, the refiner was densified, and micron Ti powder and TiB2 NPs were more evenly distributed in Al matrix; AGS of CPAl was further refined to a best level of 58.4 μm, and the anti-fading performance of the refiner was improved. The mechanism analysis shows that the settling velocity of dispersed TiB2 NPs in aluminum melt was slowed down with improving dispersibility of TiB2 and decreasing agglomeration, causing more sufficient effects on promotion of grain nucleation and inhibition of grain growth, which is the key to the excellent CPAl grain refining effect of hot extruded Al-Ti-B refiner. |
| Key words: Al-Ti-B grain refiner high-energy ball milling hot extrusion dispersion of TiB2nanoparticles grain refinement |
