ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Deformation behaviors under quasi-static and dynamic compression and high velocityimpact condition of Ti-6Al-4V ELI (extra low interstitial) alloys in two different conditions wereinvestigated. Mill annealed (MA) alloy, consisted of equiaxed α, and thermomechanically treated(TMT) alloy, consisted of mixed structure of equiaxed α and transformed β, were prepared.Compression tests were performed in low strain rate regime using hydraulic testing machine andwere performed in high strain rate regime using split Hopkinson pressure bar. High velocity impacttests were also performed by impacting the test projectiles made of these alloys against a steel targetat a velocity of ~400m/s. The compression test results showed that deformation behaviors wereinfluenced by the strain hardening exponent at low strain rate regime, and by both the strainhardening exponent and the strain-rate hardening rate at high strain rate regime. TMT alloy showedhigher strength but almost similar fracture strain as MA alloy at a high strain rate of ~6000/s, due tothe effect of strain-rate hardening. The high velocity impact test results showed that the projectile ofTMT alloy withstood without fracture at higher impact velocity, but the maximum amounts ofdeformation prior to crack were nearly the same for both alloys. These results were in accord withthe results of compression tests at high strain rate regime, that is, higher strength but same fracturestrain of TMT alloy compared to MA alloy
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2269.pdf
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