Creep behavior of Mg-10Gd-xZn (x=2 and 6 wt%) alloys

被引：22

作者：

Srinivasan, A. ^{[1
,2
]}

Dieringa, H. ^{[1
]}

Mendis, C. L. ^{[1
]}

Huang, Y. ^{[1
]}

Kumar, R. Rajesh ^{[2
]}

Kainer, K. U. ^{[1
]}

Hort, N. ^{[1
]}

机构：

[1] Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr, D-21502 Geesthacht, Germany

[2] CSIR Natl Inst Interdisciplinary Sci & Technol, Thiruvananthapuram 695019, Kerala, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 649卷

关键词：

Magnesium alloys; Casting; Mechanical Characterization; Electron microscopy; ZN-GD ALLOYS; Y-ZR ALLOYS; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; MG-GD; CORROSION PROPERTIES; HIGH-TEMPERATURE; RARE-EARTH; MICROSTRUCTURE; PHASE;

D O I：

10.1016/j.msea.2015.09.113

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Creep behavior of Mg-10Gd-xZn alloys was investigated with two Zn contents, 2 and 6 wt%. The as cast microstructure of alloys contained (Mg, Zn)(3)Gd phase at the interdendritic regions and long period stacking ordered (LPSO) phase in the matrix. Increase in the Zn content from 2% to 6%, increased the volume fraction and morphology of second phase [(Mg,Zn)(3)Gd]. Creep testing at 250 and 300 degrees C with stress levels between 50 and 120 MPa indicated that increase in Zn content or temperature reduced the creep performance of the Mg-10Gd-xZn alloys. The minimum creep rate of Mg-10Gd-2Zn was one order less that of Mg-10Gd-6Zn. Dynamic precipitation was found in both the alloys during creep deformation at 250 degrees C and strengthened the alloys: prismatic platelets (Mg5Gd) were observed perpendicular to the LPSO phase in Mg-10Gd-2Zn alloy whereas basal oval precipitates (ternary composition) parallel to the LPSO occurred in Mg-10Gd-6Zn alloy. The dynamic precipitates were not observed in alloys during creep at 300 degrees C. Ternary bulk precipitates at the LPSO phase was observed in both alloys and at all testing conditions which facilitated the cracking during deformation. More continuous second phase at the interdendritic boundaries facilitated easy cracking in Mg-10Gd-6Zn alloy and hence reduced the creep performance. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：158 / 167

页数：10

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