NDLI: Comparative load-relaxation behaviour of high-aluminium zinc-based alloys

Content Provider	Springer Nature Link
Author	Anwar, M. Murphy, S.
Copyright Year	2001
Abstract	The load relaxation behaviour of sand-cast alloys ZA8, ZA12, ZA27, Cosmal, SuperCosmal and LM25 were measured at test temperatures of 80, 100 and 120°C. ISO-metric 6 × 1 steel screws were set into cut-threaded sand castings with a preload of 6 kN, and the gradual loss of load was monitored for a period of 10,000 minutes (166.7 hours). The rate of load relaxation increased with temperature, and declined with time. The aluminium alloy LM25 had the best resistance to load relaxation amongst the alloys tested, followed in decreasing order by SuperCosmal, Cosmal and the ZA alloys. All the ZA alloys had very similar resistance to load relaxation, but ZA12 was marginally better and ZA8 marginally poorer than ZA27. Among this group of alloys, with different detailed chemistry, aluminium content appeared to be the most important factor in determining resistance to load relaxation. The kinetics of load relaxation could be described by an expression similar to that obeyed by other zinc alloys in pressure-diecast form: ln P = α[Q/RT − ln B − ln t] where P is the load retained after time t at absolute temperature T, α and B are constants, Q is an effective activation energy for relaxation and R the gas constant. A systematic variation of the constants α and Q showed that the correlation was only approximate.
Starting Page	411
Ending Page	417
Page Count	7
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	36
Issue Number	2
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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