Experimental investigations of the Ag–Cu–Ge system

Akhmetova, A.; Dinsdale, Alan; Khvan, A.; Чеверикин, В. В.; Kondratyev, A.V.; Ivanov, D. O.

doi:10.1016/j.jallcom.2015.01.028

Cited by 7 publications

(2 citation statements)

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“…During solidification as the temperature drops towards room temperature, the solubility of Cu in Ag decreases, and the solubility of Cu in Ag at room temperature is zero. The presence of Ge does not interfere with the solubility limits of Cu in Ag, except for the formation of Cu-rich phases (Cu 3 Ge and Cu 5 Ge) 16 . The observed melt pool is generally narrow (~100 μm in width) and shallow (~30 μm in depth).…”

Section: Resultsmentioning

confidence: 99%

“…Here, we report the fundamental mechanisms behind premature failure in an additively manufactured metallic material. Ag-Cu-Ge was chosen because Ag-Cu does not form any complex intermetallic phases for small Cu contents and Cu-Ge mostly forms the Cu 3 Ge and/or Cu 5 Ge phases that precipitate in the Ag-based matrix 16 . Hence, the formation of complex intermetallic phases and their detrimental effects can be avoided.…”

Section: Introductionmentioning

confidence: 99%

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Premature failure of an additively manufactured material

Wang

Xie

et al. 2020

NPG Asia Mater

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Additively manufactured metallic materials exhibit excellent mechanical strength. However, they often fail prematurely owing to external defects (pores and unmelted particles) that act as sites for crack initiation. Cracks then propagate through grain boundaries and/or cellular boundaries that contain continuous brittle second phases. In this work, the premature failure mechanisms in selective laser melted (SLM) materials were studied. A submicron structure was introduced in a SLM Ag-Cu-Ge alloy that showed semicoherent precipitates distributed in a discontinuous but periodic fashion along the cellular boundaries. This structure led to a remarkable strength of 410 ± 3 MPa with 16 ± 0.5% uniform elongation, well surpassing the strength-ductility combination of their cast and annealed counterparts. The hierarchical SLM microstructure with a periodic arrangement of precipitates and a high density of internal defects led to a high strain hardening rate and strong strengthening, as evidenced by the fact that the precipitates were twinned and encircled by a high density of internal defects, such as dislocations, stacking faults and twins. However, the samples fractured before necking owing to the crack acceleration along the external defects. This work provides an approach for additively manufacturing materials with an ultrahigh strength combined with a high ductility provided that premature failure is alleviated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%