Modification of eutectic Si and the microstructure in an Al-7Si alloy with barium addition

被引：55

作者：

Rao, Jinsong ^{[1
]}

Zhang, Jin ^{[1
]}

Liu, Ruxue ^{[1
]}

Zheng, Jiang ^{[1
]}

Yin, Dongdi ^{[2
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Minist Educ, Int Joint Lab Light Alloys, Chongqing 400044, Peoples R China

[2] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 728卷

基金：

中国国家自然科学基金;

关键词：

Al-Si based alloy; Modification mechanism; Microstructure; Mechanical properties; MECHANICAL-PROPERTIES; NUCLEATION; STRONTIUM; GROWTH;

D O I：

10.1016/j.msea.2018.05.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of Barium (Ba) addition (0, 0.05, 0.15, 0.5 wt. pct) on the microstructure and mechanical properties of an Al-7Si alloy was studied. Differential scanning calorimetry was employed to analyze the nucleation behavior of eutectic Si. Transmission electron microscopy was used to clarify growth mechanism of eutectic Si. The result indicates that the addition of 0.15 wt. pct Ba modifies the morphology of eutectic Si from coarse flake-like to fine fibrous, which dramatically improves the ultimate tensile strength and elongation. However, Ba addition (>= 0.15 wt. pct) induces the formation of coarse blocky Ba containing phase (i.e. Al2Si2 Ba phase) and porosity increment, and resultantly has a deleterious effect on the ductility. Thermal analysis reveals that Ba addition suppresses the nucleation of eutectic Si due to the formation of Ba3P2 phase. Significant multiply Si twins with high density was observed in the Ba containing alloy, which provides an experimentally support to the impurity-induced twinning growth mechanism.

引用

页码：72 / 79

页数：8

共 27 条

[1]

Abdollahi A., 1998, Int. J. Cast Met. Res, V11, P145, DOI [10.1080/13640461.1998.11819269, DOI 10.1080/13640461.1998.11819269]

[2]

[Anonymous], PHYS CHEM

[3]

[Anonymous], LIGHT MET

[4] Microstructure based modeling of β phase influence on mechanical response of cast AM series Mg alloys [J].

Barker, E. I. ;

Choi, K. S. ;

Sun, X. ;

Deda, E. ;

Allison, J. ;

Li, M. ;

Forsmark, J. ;

Zindel, J. ;

Godlewski, L. .

COMPUTATIONAL MATERIALS SCIENCE, 2014, 92 :353-361

[5] Casting defects and the tensile properties of an Al-Si-Mg alloy [J].

Caceres, CH ;

Selling, BI .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1996, 220 (1-2) :109-116

[6] Eutectic nucleation and growth in hypoeutectic Al-SI alloys at different strontium levels [J].

Dahle, AK ;

Nogita, K ;

Zindel, JW ;

McDonald, SD ;

Hogan, LM .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (04) :949-960

[7] PROPAGATION MECHANISM OF GERMANIUM DENDRITES [J].

HAMILTON, DR ;

SEIDENSTICKER, RG .

JOURNAL OF APPLIED PHYSICS, 1960, 31 (07) :1165-1168

[8]

Knuutinen A., 2001, Journal of Light Metals, V1, P241, DOI [10.1016/S1471-5317(02)00006-8, DOI 10.1016/S1471-5317(02)00006-8]

[9]

Knuutinen A., 2001, Journal Light Metals, V1, P229, DOI [10.1016/S1471-5317(02)00004-4, DOI 10.1016/S1471-5317(02)00004-4]

[10] Solution Treatment Effects on Microstructure and Mechanical Properties of Al-(1 to 13 pct)Si-Mg Cast Alloys [J].

Lados, Diana A. ;

Apelian, Diran ;

Wang, Libo .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2011, 42 (01) :171-180

← 1 2 3 →