文章信息/Info

Title:

Development of Grain Refining Mechanism of Al Alloys by Al�睺i�睟 Master Alloys

作者:

韓延峰1; 2; 張瀚龍1; 2; 徐鈞1; 2; 張佼1; 2; 孫寶德1; 2; 3

1.上海交通大學材料科學與工程學院，上海 200240

2.上海交通大學 上海市先進高溫材料及其精密成形重點實驗室，上海 200240

3.上海交通大學 金屬基復合材料國家重點實驗室，上海 200240

Author(s):

HAN Yanfeng1; 2; ZHANG Hanlong1; 2; XU Jun1; 2; ZHANG Jiao1; 2; SUN Baode1; 2; 3

1.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

2. Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming，Shanghai Jiao Tong University, Shanghai 200240, China

3. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China

關鍵詞:

鋁合金; 凝固; 異質形核; 晶粒細化; 液/固界面

Keywords:

Al alloys;  solidification;  heterogeneous nucleation;  grain refinement;  liquid/solid interface

DOI:

10.7502/j.issn.1674-3962.2018.08.09

文獻標志碼:

A

摘要:

綜述了Al-Ti-B中間合金細化鋁合金的現有理論、假說以及發展趨勢，分析了現有異質形核模型的不足。形核相在異質核心上的形核屬于液�补滔嘧儯�熔體與固相質點接觸的液/固界面區微結構決定著異質形核過程。從液�补滔嘧兘嵌瘸霭l，研究熔體與異質質點間液/固界面區熔體原子有序結構形成及其在隨后異質形核過程中的演變規律，將比固�补叹Ц衿ヅ涞奈ㄏ蠓治龇椒ǜ�直接、更真實地反映異質形核的物理過程，據此對異質核心誘導形核相形核的能力進行判定將更為有效。

Abstract:

The hypotheses and development on the grain refinement of Al alloys by Al-Ti-B master alloys are reviewed. The contradictions and deputies among the present models are discussed. The heterogeneous nucleation of overgrowth phase on the substrate belongs to the liquid�瞫olid phase transformation, and the structure of corresponding liquid/solid interfaces controls the process of heterogeneous nucleation. Atomic�瞫cale studies on the structural evolution at the liquid/solid interface during heterogeneous nucleation can provide a more precise description of the physical process of heterogeneous nucleation than that in solid view.