The above figure demonstrates the impact of grain structures on fracture toughness for sheet 7000 series alloys. The fracture toughness magnitudes for the sheet alloys quoted are very large. In some cases >150MPavm Why are the values so large? OA Demonstrates the benefit of processing to promote fine grained microstructures. OB. Demonstrates the impact of retaining a deformation microstructure OC. These are plane stress fracture toughness values (Ke) so will be significantly greater than the normally quoted plane strain Kic values. D. Illustrates the benefit of transition metal grain refiners like Zr over Mn, and Cr which are more likely to be used in 2000 series alloys.
The above figure demonstrates the impact of grain structures on fracture toughness for sheet 7000 series alloys. The fracture toughness magnitudes for the sheet alloys quoted are very large. In some cases >150MPavm Why are the values so large? OA Demonstrates the benefit of processing to promote fine grained microstructures. OB. Demonstrates the impact of retaining a deformation microstructure OC. These are plane stress fracture toughness values (Ke) so will be significantly greater than the normally quoted plane strain Kic values. D. Illustrates the benefit of transition metal grain refiners like Zr over Mn, and Cr which are more likely to be used in 2000 series alloys.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Question
Q4
![Fne ef
yallized grains
plongate
unvecrystali
120
Moderate
grain sie
apect
catio
Large ALITT
BO
300 mm wide
Centre-notched
panels
25
30
Sheet thickness (mm)
Fig. 242 Efect of recrystallizanion and grain size and shape of varloun alloys based on the
Al-Zn-Me-Cu symem (trom Thompson, D.S. Met Trans, SA 71, 1975)
The above figure demonstrates the impact of grain structures on fracture toughness for sheet 7000 series alloys. The fracture toughness magnitudes for the sheet alloys quoted are very large. In some cases
>150MPavm. Why are the values so large?
OA Demonstrates the benefit of processing to promote fine grained microstructures.
OB. Demonstrates the Impact of retaining a deformation microstructure
OC. These are plane stress fracture toughness values (Ke) so will be significantly great
than the normally quoted plane strain Ke values.
O D. Illustrates the benefit of transition metal grain refiners like Zr over Mn, and Crwhich are more likely to be used in 2000 series alloys.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F576fbd54-3737-4dc1-bc60-067634c21ca8%2Fefdfec2e-5cc4-48b4-8359-f1a0d60f54b3%2Fwwa1xk9_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Fne ef
yallized grains
plongate
unvecrystali
120
Moderate
grain sie
apect
catio
Large ALITT
BO
300 mm wide
Centre-notched
panels
25
30
Sheet thickness (mm)
Fig. 242 Efect of recrystallizanion and grain size and shape of varloun alloys based on the
Al-Zn-Me-Cu symem (trom Thompson, D.S. Met Trans, SA 71, 1975)
The above figure demonstrates the impact of grain structures on fracture toughness for sheet 7000 series alloys. The fracture toughness magnitudes for the sheet alloys quoted are very large. In some cases
>150MPavm. Why are the values so large?
OA Demonstrates the benefit of processing to promote fine grained microstructures.
OB. Demonstrates the Impact of retaining a deformation microstructure
OC. These are plane stress fracture toughness values (Ke) so will be significantly great
than the normally quoted plane strain Ke values.
O D. Illustrates the benefit of transition metal grain refiners like Zr over Mn, and Crwhich are more likely to be used in 2000 series alloys.
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