Effect of potent TiB2 addition levels and impurities on the grain refinement of Al

In the present work, the effect of potent TiB2 particle addition levels and impurities on the grain refinement of two Al compositions was investigated. Results showed that no effective grain refinement was achieved in high purity Al (HP-Al) up to particle density levels as high as 2.5 × 1014/m3. In...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2016-12, Vol.689, p.401-407
Main Authors: Zhou, L., Gao, F., Peng, G.S., Alba-Baena, N.
Format: Article
Language:English
Subjects:
Aluminium alloys
Grain refinement
Impurities
TiB2 particles
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the present work, the effect of potent TiB2 particle addition levels and impurities on the grain refinement of two Al compositions was investigated. Results showed that no effective grain refinement was achieved in high purity Al (HP-Al) up to particle density levels as high as 2.5 × 1014/m3. In commercial purity Al (CP-Al) fine grain refined structures were observed with merely a particle density of 0.35 × 1013/m3. As more particles were added into the CP-Al melt, the number of grains formed showed an overall increase while the calculated particle efficiency showed a general decrease, consistent with the prediction of interdependence theory. Such results show that the impurities in CP-Al play a significant role in refining the grain structures. [Display omitted] •Self-prepared potent TiB2 is added into two pure al (HP and CP) as grain refiner.•HP-Al is not effectively refined with high addition of potent TiB2.•Low potent TiB2 addition in CP-Al transforms columnars into fine equiaxed grains.•Impurities in CP-Al melt plays a significant role in restricting grain growth.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.07.062