Effect of cw-CO2 Laser Surface Treatment on Structure and Properties of AZ91 Magnesium Alloy
PBN-AR
Instytucja
Wydział Inżynierii Produkcji i Technologii Materiałów (Politechnika Częstochowska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Optics and Lasers in Engineering
ISSN
0143-8166
EISSN
Wydawca
Elsevier
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
63-69
Numer tomu
Vol.81
Liczba arkuszy
Autorzy
(liczba autorów: 2)
Słowa kluczowe
en
magnesium alloy
laser remelting
surface
Streszczenia
Język
en
Treść
In the study, samples of AZ91 magnesium alloy were subjected to a surface remelting treatment by means of a continuous wave (cw) CO2 laser. The scope of the investigation included both macro- and microstructural examination, hardness measurements, and wear resistance tests. The investigation has shown that remelting treatment leads to a strong refinement of structure in the surface layer and a more even distribution of phases. Fine α-phase dendrites have been observed to dominate in the remelting zone. The dendritic arm spacing in the laser treated surface was in the range of 1–2.5 μm. The structural changes triggered by remelting have contributed to an increase in the hardness and the wear resistance of AZ91 alloy. The microhardness of the remelted zone has increased to 71–93 HV0.05 for single-strip remelting and to 84–107 HV0.05 for multi-strip remelting in comparison with about ~60 HV0.05 for untreated alloy. The friction coefficient has decreased from 0.375 for material w/o treatment to 0.311 for remelted material. SEM investigations of samples after tribological tests have revealed the presence of parallel grooves proving the occurrence of microploughing and micro cutting of the material during the tribological testing. The results of the conducted investigation have indicated a beneficial influence of the cw-CO2 laser remelting treatment on the structure and properties of AZ91 alloy.
Cechy publikacji
original-article
Inne
System-identifier
50226
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