Improvement in compressive creep resistance of Al-0.2Zr alloy with L12 structured Sc-enriched precipitates

被引：23
作者：
Zhang, Jiayi [1 ,2 ]
Wang, Bin [2 ]
Wang, Hao [1 ]
Zhang, Chaomin [2 ]
机构：
[1] Natl Univ Singapore, Fac Engn, Dept Mech Engn, Singapore 117575, Singapore
[2] Cent S Univ, Dept Mat Sci & Engn, Changsha 410083, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2020年 / 159卷
关键词：
A1-0.2Zr-0.1Sc alloy; Compressive creep behaviors; Al-3(Zr; Sc); Al3Sc; Critical creep stress; MECHANICAL-PROPERTIES; RECRYSTALLIZATION BEHAVIOR; TENSILE PROPERTIES; AGING BEHAVIOR; AL-ZR; MICROSTRUCTURE; EVOLUTION; STRENGTH; TI;
D O I：
10.1016/j.matchar.2019.110024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of Sc microalloying on compressive creep behaviors of Al-0.2Zr and Al-0.2Zr-0.1Sc alloy have been studied. The steady state creep rate of Al-0.2Zr-0.1Sc alloy ranged from 1.124 x 10(-9) s(-1) to 1.926 x 10(-8) s(-1) at 90-150 degrees C/70 MPa. By contrast, the steady state creep rate of Al-0.2Zr alloy ranged from 6.862 x 10(-8) s(-1) to 8.560 x 10(-7) s(-1), indicating that Sc addition significantly improve the compressive creep resistance of Al-0.2Zr alloy. According to the TEM micrographs, except for Al-3(Zr,Sc) precipitates precipitated during aging, a large number of fine dispersed Al3Sc precipitates precipitated after creep for 70 h, which significantly hinder movements of dislocations and grain boundaries. As a result, the steady-state creep rate of Al-0.2Zr-0.1Sc alloy slightly decreases after 70 hat 150 degrees C/70 MPa. The critical creep stress value of Al-0.2Zr alloy is 47.2 MPa, and that of Al-0.2Zr-0.1Sc alloy is 68.4 MPa. The higher critical creep stress value indicates the more excellent compressive creep resistance.
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页数：10
相关论文
共 32 条
[1]   PRECIPITATION HARDENING [J].
ARDELL, AJ .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1985, 16 (12) :2131-2165
[2]   ELASTIC STABILIZATION OF ARRAYS OF PRECIPITATES [J].
BROWN, LM ;
COOK, RH ;
HAM, RK ;
PURDY, GR .
SCRIPTA METALLURGICA, 1973, 7 (08) :815-820
[3]   Effect of heat treatments on the microhardness and tensile strength of Al-0.25 wt.% Zr alloy [J].
Cadirli, Emin ;
Tecer, Hicran ;
Sahin, Mevlut ;
Yilmaz, Elif ;
Kirindi, Talip ;
Gunduz, Mehmet .
JOURNAL OF ALLOYS AND COMPOUNDS, 2015, 632 :229-237
[4]   Effect of Zr and Sc on mechanical properties and electrical conductivities of Al wires [J].
Chao, Run-ze ;
Guan, Xi-hua ;
Guan, Ren-guo ;
Tie, Di ;
Lian, Chao ;
Wang, Xiang ;
Zhang, Jian .
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2014, 24 (10) :3164-3169
[5]  
Edris A., 2002, TECHNICAL REPORT
[6]   Hall-Petch relation and boundary strengthening [J].
Hansen, N .
SCRIPTA MATERIALIA, 2004, 51 (08) :801-806
[7]  
IEC Standards, 2007, THERM RES AL ALL WIR
[8]   Interaction of recrystallization and precipitation:: The effect of Al3SC on the recrystallization behaviour of deformed aluminium [J].
Jones, MJ ;
Humphreys, FJ .
ACTA MATERIALIA, 2003, 51 (08) :2149-2159
[9]   The role of microstructural features on the electrical resistivity and mechanical properties of powder metallurgy Al-SiC-Al2O3 nanocomposites [J].
Khodabakhshi, F. ;
Simchi, A. .
MATERIALS & DESIGN, 2017, 130 :26-36
[10]   Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during isothermal aging at 375-425 °C [J].
Knipling, Keith E. ;
Dunand, David C. ;
Seidman, David N. .
ACTA MATERIALIA, 2008, 56 (01) :114-127
1234