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Precise Orientation Control of Single Crystalline NiMnGa-Based Alloys by in-situ EBSD Analysis

A. Szewczyk M. Faryna A. Wójcik Wojciech Maziarz R. Chulist
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 1171-1175 | DOI: 10.24425/amm.2023.145490
Keywords Orientation monocrystal EBSD austenite; martensite
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Abstract

The article presents a precise method for the orientation process of NiMnGa-based single crystals. For this method, a scanning electron microscope equipped with an EBSD camera and a heating stage allowing temperatures exceeding 873 K was used. The orientation process was carried out in both the high-temperature austenite phase and in the room-temperature martensite phase. The facilities allowed for determining the orientation of a single grain of austenite at elevated temperatures as well as the orientation of particular martensitic variants at room temperature. A practically perfect cubic orientation was obtained in the austenitic case with a deviation of about 1° while the samples oriented in the martensitic phase deviated from the desired orientation by 4.5-5.2°. Additionally, the training process of single crystals was carried out in order to show the influence of the orientation process on twinning stress.
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Authors and Affiliations

A. Szewczyk
1
ORCID: ORCID
M. Faryna
1
ORCID: ORCID
A. Wójcik
1
ORCID: ORCID
Wojciech Maziarz
ORCID: ORCID
R. Chulist
1
ORCID: ORCID
  1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059, Kraków, Poland

Influence of Hot Pressing on the Microstructure of Multi-Layered Ti/Al Composites

W. Kowalski H. Paul P. Petrzak Ł. Maj I. Mania M. Faryna
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1149-1156 | DOI: 10.24425/amm.2021.136435
Keywords Ti/Al multilayers electron microscopy impact test
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Abstract

Metal-intermetallic layered (MIL) composites attract considerable attention due to their remarkable structural and ballistic performance. This study aimed to develop a Ti/Al-based multilayered MIL material by adding ceramic powders, since they can improve the composite’s impact resistance. To this end, an experiment was conducted which a stack of alternating Ti and Al sheets bonded by hot pressing; Ti/Al multilayers containing additional layers of Al2O3 and SiC powders were also produced. The samples obtained were examined using electron microscopy techniques. The clads’ mechanical properties were investigated using a Charpy hammer. In the reaction zone, only one intermetallic phase occurred: the Al3Ti phase. The model with an additional Al2O3 layer showed the highest impact energy. None of the Ti/Al clads broke during the Charpy impact test, a result proving their high ductility.
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Bibliography

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Authors and Affiliations

W. Kowalski
1
ORCID: ORCID
H. Paul
1
ORCID: ORCID
P. Petrzak
1
ORCID: ORCID
Ł. Maj
1
ORCID: ORCID
I. Mania
1
ORCID: ORCID
M. Faryna
1
ORCID: ORCID
  1. Institute of Metallurgy and Materials Science , Polish Academy of Sciences , 25 Reymonta Str., 30-059 Kraków, Poland

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