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Transcript of Structure and mechanical properties of explosive welded Mg / Al bimetal Institute of Materials...
![Page 1: Structure and mechanical properties of explosive welded Mg / Al bimetal Institute of Materials Research SAV Košice, Slovak republic Dušan Balga et al.](https://reader035.fdocuments.us/reader035/viewer/2022062408/56649f265503460f94c3dcc4/html5/thumbnails/1.jpg)
Structure and mechanical properties of explosive welded
Mg / Al bimetal
Institute of Materials Research SAV Košice,Slovak republic
Dušan Balga et al.| 2014 |
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Outline
1. our material
2. metallography
3. optical profilometry
4. SEM / EDX
5. microhardness
6. hard X-ray micro-diffraction experiment– phase analysis– computation of lattice parameters of Al and Mg
7. conclusion
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Mg / Al bimetal
• Cooperation and word of thanks:– prof. Ing. Eva Mazancová, CSc.– Ing. Dmytro OstroushkoVŠB-Technical University of Ostrava, Czech republic
manufacturer: EXPLOMET, PolandMg:- lightest among
metallic materials- density is about
2/3 of that of aluminium
- recycled without any degradation in physical properties
Al:- corrosion
resistance - high strength to
weight ratio- good formability
C o m b i n a t i o n o f M g a n d A l w o u l d b e p r o m i s i n g s t r u c t u r a l m a t e r i a l ( a e r o s p a c e , a u t o m o b i l e i n d u s t r y )
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Metallography
• average thickness of the interface 45 microns
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Optical profilometry
• the difference is approximately 8 microns (Al higher)
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Optical profilometry
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SEM/EDX
Element Weight% Atomic% O K 0.98 1.73Al K 90.04 94.28Cu K 8.98 3.99
Al
Element Weight% Atomic% O K 1.49 2.25Mg K 98.31 97.58Si K 0.20 0.17
weld, tilt of the specimen 70°
Mg
Mg
Al
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SEM/EDX
Element
POINT:
Mg
[wt. %]
Al
[wt. %]
Si
[wt. %]
Fe
[wt. %]
Cu
[wt. %]
O
[wt.%]
1 6 27,3 0,4 34,1 32,2 -
2 3,7 81,7 - 1,6 10,5 2,5
3 85,4 11,7 0,2 - - 2,7
4 88,9 - 0,7 - 1,2 9,2
5 95,4 - - - - 4,6
Mg
Al
weld, tilt of the specimen 70°
Al
Al
weld, tilt of the specimen 0°
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Micro - hardness
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• step: 120 microns• micro - hardness of the joined materials measured far
from their interface is similar for both materials• in the region of interface the hardness drops down by
40% to about 50 HV0.1
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Hard X-ray micro-diffraction experiment
beam size: 2,2 x 34 m
E= 99 keV
251 2D XRD patterns
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weld Al
Mg
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Phase analysis
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Al
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Mg
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Conclusion– the results of metallographic and microchemical
analysis showed that a wavy Al / Mg explosive welded interface is molten in a very thin (45 m wide) region
– in the welded bond, there is substantial chemical inhomogeneity
– hardness in the middle of the Al / Mg interface region drops down by 40% from ~80HV0.1 to ~ 50 HV0.1 indicating some kind of thermal induced microstructure relaxation
– at the interface no intermetallics were observed– we proved an existence of solid solution with
gradually changed chemical composition from the centre of weld to the material
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Acknowlegements• Ing. Karel Saksl, DrSc.
Institute of Materials Research SAV,
Slovak republic
• prof. Ing. Eva Mazancová, CSc.
• Ing. Dmytro OstroushkoVŠB – Technical University of Ostrava,
Czech republic
• the staffs at Beamline P07 – PETRA III, HASYLAB (DESY) – Germany for technical support during experiment
• Explomet Company• Slovak Grant Agency for
Science – Grant No. 2/0128/13
• Ministry of Education, Youth and Sports of Czech Republic– project No. L01203
"Regional Materials Science and Technology Centre – Feasibility program“
– project MK 9333413 No. 02613/2013/RRC “International research teams”
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THANKS FOR YOUR
ATTENTION
• Slovak Academy of Sciences• Institute of Material Research
• Kosice, Slovakia