Macro-heterogeneities in microstructures, concentrations, defects and tensile properties of die cast Al-Mg-Si alloys

被引：9

作者：

Ji, Shouxun ^{[1
]}

Yang, Hailin ^{[1
,2
]}

Cui, Xiaopeng ^{[1
,3
]}

Fan, Zhongyun ^{[1
]}

机构：

[1] Brunel Univ London, Inst Mat & Mfg, BCAST, Uxbridge UB8 3PH, Middx, England

[2] Cent S Univ, State Key Lab Powder Met, Changsha, Hunan, Peoples R China

[3] Changchun Univ Technol, Dept Mat Engn, Changchun, Jilin, Peoples R China

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2017年 / 33卷 / 18期

基金：

英国工程与自然科学研究理事会; “创新英国”项目;

关键词：

Alloys; microstructure; mechanical properties; solidification; defects; hetero-structures; EUTECTIC ALLOY; MECHANICAL-PROPERTIES; AL-11SI-2CU-FE ALLOY; ALUMINUM-ALLOYS; SOLIDIFICATION; GROWTH; FLOW; EVOLUTION; LAMELLAR; BEHAVIOR;

D O I：

10.1080/02670836.2017.1334309

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The heterogeneities in tensile properties, microstructure, solute concentrations and defects levels were studied for the castings with different thicknesses made by high pressure die cast Al-Mg-Si alloys. For the local mechanical properties, the casting skin provided the highest, whereas the casting centre provided the lowest yield strength, ultimate tensile strength and elongation. The microstructural heterogeneity was characterised by the segregation of coarse fragmented dendrites, the reduction of solute concentrations of Mg and Si, and the increase of porosity level from the surface to the centre of castings. The growth velocities of eutectic alpha-Al phase estimated using the Jackson-Hunt model confirm that the growth variation is larger in the thin castings than that in thick castings.

引用

页码：2223 / 2233

页数：11

共 37 条

[1] Analysis of liquid metal flow in die casting [J].

Barone, MR ;

Caulk, DA .

INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE, 2000, 38 (12) :1279-1302

[2] Microstructural characterization of unidirectional solidified eutectic Al-Si-Ni alloy [J].

Boyuk, U. ;

Engin, S. ;

Marasli, N. .

MATERIALS CHARACTERIZATION, 2011, 62 (09) :844-851

[3] Directional solidification of the aluminium-copper eutectic alloy [J].

Çadirli, E ;

Ülgen, A ;

Gündüz, M .

MATERIALS TRANSACTIONS JIM, 1999, 40 (09) :989-996

[4] Effect of growth rates and temperature gradients on the lamellar spacing and the undercooling in the directionally solidified Pb-Cd eutectic alloy [J].

Çadirli, E ;

Kaya, H ;

Gündüz, M .

MATERIALS RESEARCH BULLETIN, 2003, 38 (9-10) :1457-1476

[5]

Campbell J., 2003, CASTINGS, V2nd

[6] Assessment of homogeneity of the shear-strain pattern in Al-7 wt%Si casting alloy processed by high-pressure torsion [J].

Cepeda-Jimenez, C. M. ;

Orozco-Caballero, A. ;

Garcia-Infanta, J. M. ;

Zhilyaev, A. P. ;

Ruano, O. A. ;

Carreno, F. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2014, 597 :102-110

[7] Skin solidification during high pressure die casting of Al-11Si-2Cu-Fe alloy [J].

Chen, ZW .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 348 (1-2) :145-153

[8] Short shots and industrial case studies: Understanding fluid flow and solidification in high pressure die casting [J].

Cleary, Paul W. ;

Ha, Joseph ;

Prakash, Mahesh ;

Nguyen, Thang .

APPLIED MATHEMATICAL MODELLING, 2010, 34 (08) :2018-2033

[9] Rheological behaviour of the mushy zone and its effect on the formation of casting defects during solidification [J].

Dahle, AK ;

StJohn, DH .

ACTA MATERIALIA, 1998, 47 (01) :31-41

[10] Evolution of sludge particles in secondary die-cast aluminum alloys as function of Fe, Mn and Cr contents [J].

Ferraro, Stefano ;

Fabrizi, Alberto ;

Timelli, Giulio .

MATERIALS CHEMISTRY AND PHYSICS, 2015, 153 :168-179

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