EFFECTS OF TEST ENVIRONMENT AND GRAIN-SIZE ON THE TENSILE PROPERTIES OF L12-ORDERED (CO,FE)3V ALLOYS

被引：6

作者：

NISHIMURA, C ^{[1
]}

LIU, CT ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1992年 / 152卷 / 1-2期

关键词：

D O I：

10.1016/0921-5093(92)90060-E

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of test environment, grain size and heat treatment on the tensile properties and fracture behavior of L1(2)-ordered (Co78Fe22)3V and (Co85Fe15)3V alloys was studied at room temperature. The tensile ductility depends strongly test environments; the elongation decreases in the sequence of oxygen, vacuum, air and distilled water. The loss in elongation is accompanied by a change in fracture mode from transgranular to intergranular. When tested in oxygen or vacuum, (Co78Fe22)3V specimens exhibited predominantly transgranular fracture, while (Co85Fe15)V specimens exhibited essentially intergranular fracture. Grain refinement of (Co78Fe22)3V resulted in a ductility improvement in a ductility improvement in air, while such a beneficial effect of grain refinement was not observed in (Co85Fe15)3V. These results suggest that: (1) (Co,Fe)3V alloys exhibit a moisture-induced hydrogen embrittlement and (2) grain boundaries are more intrinsically brittle in (Co85Fe15)3V than in (Co78Fe22)3V. The presence of a brittle hexagonal phase is suggested to bc the reason for the observed grain-boundary brittleness in (Co85Fe15)3V.

引用

页码：146 / 152

页数：7

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