EFFECT OF GRAIN-SIZE ON THE STRESS-RELAXATION RATE IN TI-6.5 AT-PERCENT NB ALLOY CRYSTALS

被引：14

作者：

AKHTAR, MK ^{[1
]}

KHWAJA, FA ^{[1
]}

BUTT, MZ ^{[1
]}

机构：

[1] GOVT COLL,DEPT PHYS,LAHORE 54000,PAKISTAN

来源：

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH | 1994年 / 143卷 / 01期

关键词：

D O I：

10.1002/pssa.2211430107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Stress relaxation in the polycrystalline Ti 6.5 at% Nb alloy is studied at room temperature with the grain size as a principal variable. It is observed that for a given initial stress level from which stress relaxation at constant strain rate 1.6 x 10(-3) s-1 is allowed to start, the relaxation rate depends on the average grain diameter D in the range 67 to 117 mum, while it is independent of D for 612 to 751 mum. In addition, the data obtained are also analysed in terms of a single barrier model of stress relaxation. The intrinsic height of the energy barrier to the movement of relaxing dislocations is found to be 2.34 and 1.32 eV for fine-grained and coarse-grained crystals, respectively. This is of the order of magnitude for recovery processes.

引用

页码：59 / 63

页数：5

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