Eutectic nucleation in Al-7 wt pct Si-Mg casting alloys

被引：0

作者：

Chen, Zhongwei ^{[1
]}

Ma, Cuiying ^{[1
]}

Zhao, Jing ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2012年 / 25卷 / 05期

关键词：

Al-Si-Mg alloy; Eutectic nucleation; Ce and Sr addition; DSC; SOLIDIFICATION; STRONTIUM; MICROSTRUCTURE; BETA-AL5FESI; PHOSPHORUS; MECHANISM;

D O I：

10.11890/1006-7191-125-340

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The nucleation of eutectic crystals of hypoeutectic Al-7 wt pct Si-Mg casting alloys modified by Ce and Sr was studied by using differential scanning calorimeter (DSC) and scanning electron microscope (SEM). DSC results were applied to calculate the values of activity energy and nucleation work of eutectic nucleation for the alloys. These values were decreased and the eutectic nucleation frequency was increased with the addition of Ce and Sr to the alloys. Moreover, the morphology of eutectic silicon in the modified alloys was partially or fully modified as fine, fibrous or coral, and DSC plots show that the eutectic undercooling of Al-7 wt pct Si-Mg alloys were increased with additions of modified agents. The mechanism of eutectic modification is combined actions of the accelerated nucleation and the restricted growth.

引用

页码：340 / 346

页数：7

共 50 条

[11] On macrohardness testing of Al-7 wt.% Si-Mg alloys - I. Geometrical and mechanical aspects
Tiryakioglu, M
Campbell, J
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 361 (1-2): : 232 - 239
[12] The quench sensitivity of cast Al-7 wt pct Si-0.4 wt pct Mg alloy
Zhang, DL
Zheng, L
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1996, 27 (12): : 3983 - 3991
[13] EFFECT OF TWO-STEP AGING ON MECHANICAL PROPERTIES OF Al-7%Si-Mg CASTING ALLOYS.
Fujiki, Shunsuke
Tsukuda, Makoto
Koike, Susumu
Fukui, Izumi
Keikinzoku/Journal of Japan Institute of Light Metals, 1983, 33 (12): : 713 - 717
[14] Influence of Mg content on the microstructure and solid solution chemistry of Al-7%Si-Mg casting alloys during solution treatment
Taylor, JA
St John, DH
Barresi, J
Couper, MJ
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 : 277 - 282
[15] Evaluation of structural integrity in cast Al-7 %Si-Mg alloys via toughness
Tiryakioglu, M
Campbell, J
MECHANISMS AND MECHANICS OF FRACTURE: THE JOHN KNOTT SYMPOSIUM, 2002, : 111 - 115
[16] Relationship between Defect Size and Fatigue Life Distributions in Al-7 Pct Si-Mg Alloy Castings
Murat Tiryakioğlu
Metallurgical and Materials Transactions A, 2009, 40 : 1623 - 1630
[17] Relationship between Defect Size and Fatigue Life Distributions in Al-7 Pct Si-Mg Alloy Castings
Tiryakioglu, Murat
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2009, 40A (07): : 1623 - 1630
[18] On macrohardness testing of Al-7 wt.% Si-Mg alloys - II. An evaluation of models for hardness-yield strength relationships
Tiryakioglu, M
Campbell, J
Staley, JT
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 361 (1-2): : 240 - 248
[19] STRUCTURAL INVESTIGATION OF MULTIPLE AGING OF AL-7 WT PCT ZN-2.3 WT PCT MG
DEARDO, AJ
SIMENSEN, CJ
METALLURGICAL TRANSACTIONS, 1973, 4 (10): : 2413 - 2421
[20] Effect of heat treatment on wear behaviour of Al-7 wt%Si-X wt% Mg alloys
Parida, J.
Pattnaik, S. C.
Mishra, S. C.
Behera, A.
MATERIALS TODAY-PROCEEDINGS, 2020, 33 : 4976 - 4980

← 1 2 3 4 5 →