Effect of T4 heat treatment on microstructure and hardness of A356 alloy refined by Ga + In + Sn mixed alloy

被引：22

作者：

Dang, B. ^{[1
]}

Li, Y. B. ^{[1
]}

Liu, F. ^{[1
]}

Zuo, Q. ^{[1
]}

Liu, M. C. ^{[1
]}

机构：

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

来源：

MATERIALS & DESIGN | 2014年 / 57卷

关键词：

Eutectic Si; Spheroidization; Cooling rate; Solution treatment; Aluminum alloy; MECHANICAL-PROPERTIES; SI; BEHAVIOR;

D O I：

10.1016/j.matdes.2013.12.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A356 alloy was solidified with cooling rate enhanced by phase transition cooling (PTC) of Ga + In + Sn mixed alloy, and then solution treated at 540 degrees C, 500 degrees C and 450 degrees C for different time, followed by quenching and immediately natural aging. Evolution of the corresponding microstructure and hardness with the solution temperature and time were studied. The as-cast sample was hardened due to the refined microstructures, the large solubility of Si-and Mg-clusters in Al matrix and the nano-scale Si precipitates. The modification of eutectic Si was verified to depend on the initially solidified morphology of Si, the solution temperature and time, for example, the Si particles subjected to high cooling rate and high solution temperature become more readily spheroidized. The age hardening, from the hardness tests and differential scanning calorimetry (DSC) results, was ascribed to be associated with the Guinier-Preston (GP) zones. It can be concluded that an optimal combination of solidification with heat treatment may achieve the better mechanical property but with the less product cost. 2013 Elsevier Ltd. All rights reserved.

引用

页码：73 / 78

页数：6

共 25 条

[1] SECOND PHASE DISSOLUTION [J].

AARON, HB ;

KOTLER, GR .

METALLURGICAL TRANSACTIONS, 1971, 2 (02) :393-&

[2] Effects of multiple-step thermal ageing treatment on the hardness characteristics of A356.0-type Al-Si-Mg alloy [J].

Abdulwahab, M. ;

Madugu, I. A. ;

Yaro, S. A. ;

Hassan, S. B. ;

Popoola, A. P. I. .

MATERIALS & DESIGN, 2011, 32 (03) :1159-1166

[3] CHARACTERIZATION OF AL-SI-ALLOYS RAPIDLY QUENCHED FROM THE MELT [J].

BENDIJK, A ;

DELHEZ, R ;

KATGERMAN, L ;

DEKEIJSER, TH ;

MITTEMEIJER, EJ ;

VANDERPERS, NM .

JOURNAL OF MATERIALS SCIENCE, 1980, 15 (11) :2803-2810

[4] Response to artificial ageing of dendritic and globular Al-7Si-Mg alloys [J].

Birol, Yucel .

JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 484 (1-2) :164-167

[5] Quantification of the microconstituents formed during solidification by the Newton thermal analysis method [J].

Cruz, H. ;

Gonzalez, C. ;

Juarez, A. ;

Herrera, M. ;

Juarez, J. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2006, 178 (1-3) :128-134

[6]

Dewhirst Brian Albert., 2005, Optimization of the heat treatment of semi solid processed A356 aluminum alloy

[7] Decomposition of supersaturated solid solutions in Al-Cu-Mg-Si alloys [J].

Eskin, DG .

JOURNAL OF MATERIALS SCIENCE, 2003, 38 (02) :279-290

[8] DIFFUSION OF SILICON IN ALUMINUM [J].

FUJIKAWA, SI ;

HIRANO, KI ;

FUKUSHIMA, Y .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1978, 9 (12) :1811-1815

[9] SURFACE SELF-DIFFUSION ON SI FROM THE EVOLUTION OF PERIODIC ATOMIC STEP ARRAYS [J].

KEEFFE, ME ;

UMBACH, CC ;

BLAKELY, JM .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1994, 55 (10) :965-973

[10] GPB zones and composite GPB/GPBII zones in Al-Cu-Mg alloys [J].

Kovarik, L. ;

Court, S. A. ;

Fraser, H. L. ;

Mills, M. J. .

ACTA MATERIALIA, 2008, 56 (17) :4804-4815

← 1 2 3 →