Grain Refinement Mechanisms of TiC0.5N0.5 Nanoparticles in Aluminum

被引：5

作者：

Wang, Kui ^{[1
,2
]}

Jiang, Haiyan ^{[1
,2
]}

Wang, Qudong ^{[1
,2
]}

Wang, Yingxin ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys, Net Forming, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China

来源：

MATERIALS | 2023年 / 16卷 / 03期

基金：

中国国家自然科学基金;

关键词：

nanoparticle; grain refinement; cooling rate; first-principles calculation; COOLING RATE; MG-AL; ALLOYS; GROWTH; ZR; TI; ADHESION;

D O I：

10.3390/ma16031214

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, TiC0.5N0.5 nanoparticles (NPs) are shown to induce a remarkable grain refinement of aluminum at various cooling rates. The grain refinement mechanisms are systematically investigated by microstructure observation, edge-to-edge matching (E2EM) model prediction, and first-principles calculations. The experimental results suggest that as the cooling rates increase from 10 K/s to 70 K/s, a transition from intergranular to intragranular distribution of NPs occurs and the Al/TiC0.5N0.5 interface varies from incoherent to coherent. Based on the E2EM analysis combined with first-principles calculation, it is found that TiC0.5N0.5 can act as a potent nucleant for the heterogeneous nucleation of alpha-Al. By analyzing the NP effects on the nucleation and growth of alpha-Al, the grain growth restriction and nucleation promotion mechanisms are proposed to elucidate the refinement phenomena at low and high cooling conditions, respectively.

引用

页数：12

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