Effect of starting powder properties on the structure and mechanical characteristics of Al-8Cr-1.5Fe alloy for high-temperature applications

被引：0
|
作者：
Neikov, O. D. [1 ]
Sirko, A. I.
Zakharova, N. P. [1 ]
Efimov, N. A. [1 ]
Vasil'eva, G. I. [1 ]
Sharovskii, A. O. [1 ]
Samelyuk, A. V. [1 ]
Goncharuk, V. A. [1 ]
Ivashchenko, R. K. [1 ]
机构：
[1] Natl Acad Sci Ukraine, Frantsevich Inst Problems Mat Sci, Kiev, Ukraine
来源：
POWDER METALLURGY AND METAL CERAMICS | 2013年 / 52卷 / 3-4期
关键词：
gas-atomized powders; water-atomized powders; high-temperature aluminum alloy; structure; strength; strain hardening; CR-FE ALLOY; QUASI-CRYSTALLINE PARTICLES; ALUMINUM-ALLOYS; BEHAVIOR;
D O I：
10.1007/s11106-013-9507-9
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A high-temperature Al-8Cr-1.5Fe alloy has been developed for applications in the range from room temperature to 300A degrees C. The billets are obtained in two ways: using gas-atomized and water-atomized powders. Structural analysis shows that particles of the second phase in the water-atomized powders are finer and their number in the aluminum matrix is greater than that in the gas-atomized powders. The rods extruded from the water-atomized powders have much higher hardness, ultimate strength, and yield stress than those from the gas-atomized powders, plasticity being acceptable at all temperatures (20, 190, and 300A degrees C). An additional powder metallurgy operation-pulsed hot pressing-does not increase the strength of billets from either the water-atomized or gas-atomized powders. The alloy based on the water-atomized 0-63 mu m powder shows the maximum strength: 483, 332, and 261 MPa at 20, 190, and 300A degrees C, respectively.
引用
收藏
页码：144 / 153
页数：10
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