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Thermal stability of twins and strengthening mechanisms in differently oriented epitaxial nanotwinned Ag films

Published online by Cambridge University Press:  31 May 2013

Daniel Bufford ,
Haiyan Wang  and
Xinghang Zhang
Daniel Bufford
Affiliation:
Department of Mechanical Engineering, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3123
Haiyan Wang
Affiliation:
Department of Electrical Engineering, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3128
Xinghang Zhang*
Affiliation:
Department of Mechanical Engineering, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3123
*
b)Address all correspondence to this author. e-mail: zhangx@tamu.edu
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Abstract

Sputter-deposited epitaxial (111) and (110) Ag films have high-density nanotwins with respective twin boundary orientations perpendicular and angled to the growth direction. Twin density in as-deposited (111) Ag films is much greater than in (110) films, leading to higher hardness in the (111) films. Annealing up to 800 °C (homologous temperature of 0.85 Tm) leads to increased twin thickness, although the average twin thickness remains <100 nm in both systems. Twinned volume fraction falls dramatically in annealed (110) films but remains constant at ∼50% in (111) films. The mechanisms leading to the elimination of nanotwins in (110) films and their remarkable stability in (111) films at elevated temperatures are discussed. Coarsening and elimination of twins result in hardness reduction after annealing. The variety of microstructures achieved via annealing allows for the introduction of a strengthening model considering both twin and grain boundaries.

Keywords

annealingstrengthnanoscale
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1729 - 1739
Copyright
Copyright © Materials Research Society 2013 

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