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Calin Daniel Marioara

Senior Research Scientist

Calin Daniel Marioara

Senior Research Scientist

Calin Daniel Marioara
Phone: 982 83 908
Mobile: 982 83 908
Department: Materials and Nanotechnology
Office: Trondheim

publications and responsibilities

Publications

Publication

Improving thermal stability in Cu-containing Al-Mg-Si alloys by precipitate optimization

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1142642

It is demonstrated that good thermal stability in Al-Mg-Si-Cu aluminum alloys correlates with a high density of fine lath-shaped, Cu-containing, disordered L-precipitates. Alloys optimized for L retained hardness above 90 HV after 3 weeks over-aging at 473 K (200 °C). Further improvement was achieve...

Year 2014
Type Journal article
Publication

Atomic structure of hardening precipitates in an Al-Mg-Zn-Cu alloy determined by HAADF-STEM and first-principles calculations: relation to eta-MgZn2

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1038224

The structures of two nanoscale plate precipitates prevalent at maximum strength and over-aged conditions in a 7449 Al–Mg–Zn–Cu alloy were investigated. Models derived from images of high angle annular dark field scanning transmission electron microscopy were supported by first-principles calculatio...

Year 2013
Type Journal article
Publication

HAADF-STEM study of beta’-type precipitates in an over-aged Al-Mg-Si-Ag alloy

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S21312

High-resolution HAADF-STEM investigations have been performed on the crystal structure of rod-shaped precipitates growing along <100>Al directions in an Al -1.0 wt% Mg2Si alloy with 0.5 wt% Ag additions. All investigated precipitates had complex structures, consisting of Ag-containing beta’ do...

Year 2012
Type Journal article
Publication

Disordered precipitates in an Al-Mg-Si-Cu alloy

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S17812

Precipitate types that form in an Mg-rich Al-Mg-Si-Cu alloy with 0.12 wt% Ag additions, during over-aging at 200oC, have been analysed by Annular Dark Field Scanning Transmission Electron Microscopy (ADF-STEM). It was found that most precipitates had lath morphology, with the long dimension along &l...

Year 2010
Type Conference paper/Book chapter
Publication

Si/Ge network connecting precipitates in Al-Mg-Si/Ge-Cu(-Ag)

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S17823

The recent advent of Cs-corrected Transmission Electron Microscopes (TEM) improved the directly-interpretable spatial resolution of these instruments from approximately 0.2 nm to below 0.1 nm. In particular, the incoherent High-Angle Annular Dark Field Scanning TEM (HAADF-STEM) technique provides ad...

Year 2010
Type Conference paper/Book chapter
Publication

Orientation of silicon particles in a binary Al-Si alloy

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S8889

The orientations Si crystals take in aluminium, in an alloy with composition Al-1.3at%Si, were investigated by transmission electron microscopy. Hardness was measured for isothermal heat-treatments at 175oC and 260oC. Conditions analysed by TEM were 17h at 175oC and an additional 3h at 260oC, both c...

Year 2008
Type Journal article
Publication

The influence of Cu on hardness and microstructure in Al-Mg-Si alloys

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S8908

The Al-Mg-Si-(Cu) alloys are an important group of age-hardening materials with extensive industrial use due to their excellent properties such as high strength, good formability and corrosion resistance. During the aging heat treatment large numbers of nano-sized metastable precipitates are formin...

Year 2008
Type Conference paper/Book chapter
Publication

Comparative study of the beta ''-phase in a 6xxx Al alloy by 3DAP and HRTEM

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S5056

The metastable beta"-hardening phase in aged 6xxx-series Al alloys has been investigated by three-dimensional atom-probe in order to evaluate the composition (Mg5Si6) of the structure, previously determined by high-resolution transmission electron microscopy (HRTEM) and electron diffraction. For bet...

Year 2007
Type Journal article
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