Nanoporous Au foams: Variation of effective Young's modulus with ligament size. (February 2018)

• Record Type: Journal Article
• Authors: Pia, Giorgio; Carta, Maria; Delogu, Francesco
• Is Part Of: Scripta materialia. Number 144(2018)
• Page Start: 22
• Page End: 26
• Publication Date: 2018-02
• Subjects: Porous material -- Nanostructured material -- Metals and alloys -- Surface -- Kinetics; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.09.038
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: This work focuses on the effects of ligament size on the mechanical behavior of NP Au foams. NP Au structures with ligament diameter between 5 and 200 nm have been fabricated by selective Ag dissolution from Ag70 Au30 alloys prepared by mechanical alloying and subsequent annealing. Nanoindentation experiments indicate that the effective Young's modulus increases as the ligament thickness decreases. The stiffening of NP Au foams with fine ligaments is ascribed to size effects connected with surface stress states. It is shown that a phenomenological model accounting for disorder and surface contributions to Young's modulus correctly predicts the observed behavior. Graphical abstract: