Constitutive modeling of high temperature flow behavior in a Ti-45Al-8Nb-2Cr-2Mn-0.2Y alloy

被引：35

作者：

Ge, Gengwu ^{[1
]}

Zhang, Laiqi ^{[1
]}

Xin, Jingjing ^{[1
]}

Lin, Junpin ^{[1
]}

Aindow, Mark ^{[2
]}

Zhang, Lichun ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Univ Connecticut, Inst Mat Sci, Dept Mat Sci & Engn, Storrs, CT 06269 USA

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

基金：

北京市自然科学基金;

关键词：

TITANIUM ALUMINIDE ALLOYS; GAMMA-TIAL ALLOY; HIGH-NB; MECHANICAL-PROPERTIES; DYNAMIC RECRYSTALLIZATION; DEFORMATION-BEHAVIOR; HOT DEFORMATION; BETA-PHASE; MICROSTRUCTURE; STRESS;

D O I：

10.1038/s41598-018-23617-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A constitutive equation based on the hyperbolic sinusoidal Arrhenius-type model has been developed to describe the hot deformation behavior of a beta-gamma Ti-Al alloy containing 8 at.% of Nb. Experimental true stress-true strain data were acquired from isothermal hot compression tests conducted across a wide range of temperatures (1273 K similar to 1473 K) and strain rates (0.001 s(-1)similar to 1s(-1)), and the changes in the experimental conditions were reflected in the values of the Zener-Hollomon parameter. The impact of true strain was expressed through material constants (A, alpha, n and Q), and it was found that a 7th order polynomial is appropriate to express the relations between the true strain and these material constants. The average absolute relative error (AARE) and correlation coefficient (R) were used to evaluate the accuracy of the constitutive equation, and the values obtained were 6.009% and 0.9961, respectively. These results indicate that the type of constitutive equation developed here can predict the flow stress for this alloy with good accuracy over a wide range of experimental conditions. Thus, equations of this form could be applied more widely to analyses of hot deformation mechanism and microstructure evolution.

引用

页数：9

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