Powder flow during dynamic and quasistatic compaction

Page N.W. and Killen P.D. (1987) Powder flow during dynamic and quasistatic compaction. Powder Metallurgy, 30 4: 233-239. doi:10.1179/pom.1987.30.4.233


Author Page N.W.
Killen P.D.
Title Powder flow during dynamic and quasistatic compaction
Journal name Powder Metallurgy   Check publisher's open access policy
ISSN 1743-2901
Publication date 1987-01-01
Sub-type Article (original research)
DOI 10.1179/pom.1987.30.4.233
Volume 30
Issue 4
Start page 233
End page 239
Total pages 7
Subject 2505 Materials Chemistry
2211 Mechanics of Materials
3104 Condensed Matter Physics
2503 Ceramics and Composites
2506 Metals and Alloys
Abstract An experimental study has been made of the flow of metal powders in an axisymmetric die incorporating a shoulder marking an abrupt reduction of diameter in the direction of compaction. A comparison has been made between powder flow in quasistatic and dynamic (shock wave) compaction when both methods produce a compact of the same average density. With the commercial grades of aluminium, iron, and copper powders studied, higher peak pressures were necessary during dynamic compaction to produce compacts with the same average density as those made quasistatically. Measurements of powder displacement and hardness distribution showed that compacts made using the dynamic compaction had a more uniform density distribution and were appreciably denser and harder near the die walls below the shoulder. With common levels of admixed lubricant, all the powders flowed smoothly around the shoulder during quasistatic compaction. For the more ductile aluminium this was also true for dynamic compaction. However, with the powders that more strongly work hardened, closed shear surfaces were formed near the shoulder when compacted dynamically. PM/0444.
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 13 Sep 2016, 11:11:38 EST by System User