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Open AccessArticle

Ductile Compressive Behavior of Biomedical Alloys

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Lab for Mechanical Systems Engineering, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Dübendorf, Switzerland
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IMT Masken und Teilungen AG, Im Langacher 46, CH-8606 Greifensee, Switzerland
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Lab for Advanced Materials Processing, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Dübendorf, Switzerland
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Lab for Nanoscale Materials Science, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Dübendorf, Switzerland
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Author to whom correspondence should be addressed.
Metals 2020, 10(1), 60; https://doi.org/10.3390/met10010060
Received: 16 November 2019 / Revised: 19 December 2019 / Accepted: 20 December 2019 / Published: 29 December 2019
(This article belongs to the Special Issue Trends in Plasticity of Metals and Alloys)
The mechanical properties of ductile metals are generally assessed by means of tensile testing. Compression testing of metal alloys is usually only applied for brittle materials, or if the available specimen size is limited (e.g., in micro indentation). In the present study a previously developed test procedure for compressive testing was applied to determine the elastic properties and the yield curves of different biomedical alloys, such as 316L (two different batches), Ti-6Al-7Nb, and Co-28Cr-6Mo. The results were compared and validated against data from tensile testing. The converted flow curves for true stress vs. logarithmic strain of the compressive samples coincided well up to the yield strength of the tensile samples. The developed compression test method was shown to be reliable and valid, and it can be applied in cases where only small material batches are available, e.g., from additive manufacturing. Nevertheless, a certain yield asymmetry was observed with one of the tested 316L stainless steel alloys and the Co-28Cr-6Mo. Possible hypotheses and explanations for this yield asymmetry are given in the discussion section. View Full-Text
Keywords: biomedical alloys; yield asymmetry; compressive testing; flow curve biomedical alloys; yield asymmetry; compressive testing; flow curve
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MDPI and ACS Style

Affolter, C.; Thorwarth, G.; Arabi-Hashemi, A.; Müller, U.; Weisse, B. Ductile Compressive Behavior of Biomedical Alloys. Metals 2020, 10, 60.

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