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Meeting Materials Science & Technology 2019
Symposium Mechanochemical Synthesis and Reactions in Materials Science IV
Presentation Title A Mechanochemical Effect in Cutting of Ductile Metals
Author(s) Anirudh Udupa, Tatsuya Sugihara, Jason Davis, Mojib Saei, James Mann, Srinivasan Chandrasekar, Kevin P. Trumble
On-Site Speaker (Planned) Kevin P. Trumble
Abstract Scope It has long been known that highly strain hardening metals such as aluminum, copper and tantalum; and stainless steels, are quite difficult to cut, despite being relatively soft, earning them the moniker “gummy.” We examine this problem using high-speed, in situ imaging, complemented by force measurements. We show that the problem arises from the tendency of these metals to undergo a highly unsteady mode of large-strain plastic deformation - sinuous flow - characterized by large-amplitude folding. Sinuous flow can be suppressed by utilization of surface-active adsorptive media (e.g., inks, alcohols, organometallics) that effect a local ductile-to-brittle transition – a mechanochemical effect in large-strain deformation. The use of this effect greatly facilitates the cutting of these metals. Interestingly, the manifestation of the effect is coupled to the sinuous flow mode. Implications for comminution, milling and machining of these metals and potential screening of active media using this experimental approach are discussed.
Proceedings Inclusion? Planned: Other (journal publication, etc.; describe below)


A Mechanochemical Effect in Cutting of Ductile Metals
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