Prof. Qinghuan Huo
Central South University, China
Title: A three-dimensional study on the creep anisotropy of Mg-Y binary alloys
Abstract:
The compressive creep behaviors were systematically
studied on a pure Mg (0Y alloy) and various Mg-Y binary alloys (0.15Y, 1.5Y,
4.5Y, 7.5Y and 10.5Y alloys) at 523 K under various applied stresses. The
loading directions were carried out parallel to rolling direction (RD), transverse
direction (TD) and normal direction (ND), respectively. It was shown that the
creep behaviors exhibited obvious dependence on loading direction in 0Y, 0.15Y,
1.5Y and 4.5Y alloys. The creep resistance had a sequence of ND > TD ≥ RD in
these alloys. Their creep anisotropy was caused by cross-slip and twinning
dominating the creep along RD and TD while dislocation climb and pyramidal
<c+a> slip prevailing along ND. Compared to 0Y, 0.15Y and 1.5Y alloys,
the more random basal texture weakened cross-slip and twinning along RD and TD
and aroused cross-slip along ND, resulting in the decreased creep anisotropy in
4.5Y alloy. Inversely, 7.5Y and 10.5Y alloys showed a nearly creep isotropy due
to cross-slip and pyramidal <c+a> slip dominated the creep along all
three loading directions. Moreover, compared to 0Y alloy, the creep resistance
was found to be slightly increased in 0.15Y alloy and significantly increased
with increasing Y content above 1.5wt%. It was attributed to that solution
strengthening and pyramidal <c+a> dislocations collaboratively increased
the creep resistance. The improved hindering effect on twinning was also
helpful to increase the creep resistance along RD and TD. Besides, dynamic
precipitation strengthening assisted the increment of creep resistance in 10.5Y
alloy. Thus, the addition of concentrated Y element in Mg alloys is a valid
solution to eliminate the compressive creep anisotropy and simultaneously
enhance the creep resistance.
Keywords: Magnesium alloy;
Mechanical behavior; Microstructure; Deformation mechanism; Heat treatment.
Biography:
Qinghuan Huo, born in 1989, is an associate professor in School of
Materials Science and Engineering, Central South University, China.
The major research fields are microstructure
characterization, plastic processing, mechanical behaviors of light metals such
as Mg alloys and Al alloys. To date, projects
including National Natural Science Foundation of
China and Natural Science Foundation of Hunan Province have been carried out. Over 40 academic papers (First
Author and Corresponding Author) have been published in the journals ranking in
JCR Q1, and 16 Chinese patents (First Inventor) have been authorized.
The
work experience is here:
03/2018
– Present: Central South University, China
Major:
Materials Science and Engineering
Position:
Associate Professor
10/2017
– 03/2018: Tohoku University, Japan
Major:
Materials Science
Position:
Researcher
The
education experience is here:
10/2014
– 09/2017: Tohoku University,
Japan
Major:
Materials Science
Degree:
Doctor of Engineering
09/2011
– 12/2013: Central South University, China
Major:
Materials Science and Engineering
Degree:
Master of Engineering
09/2007
– 06/2011: Central South University, China
Major:
Materials Science and Engineering
Degree: Bachelor of Engineering