The Pd77Cu6Si17 (PCS) thin film metallic glasses (TFMGs) with high glass forming
ability and hardness are selected as a hard coating for improving the surface hardness of
the AZ31 magnesium alloy. Both micro- and nano-indentation tests are conducted on
the specimens with various PCS film thicknesses from 30 to 2000 nm. The apparent
hardness and the relative indentation depth (£]) are integrated by a quantitative model.
The involved interaction parameters and relative hardness values are extracted from
iterative calculations. According to the results, surface hardness can be enhanced greatly
by PCS TFMGs in the shallow region, followed by gradual decrease with increasing
£] ratio. In addition, the specimens with thinner coating (for example, 200 nm) show
greater substrate-film interaction and those with thick coating (for example, 2000 nm)
become prone to film cracking. The optimum TFMG coating thickness in this study is
estimated to be around 200 nm.
Keywords: Magnesium alloys, hardness, sputtering, thin film metallic glass,
nanoindentation
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0721111-215031 |
| Date | 21 July 2011 |
| Creators | Chen, Bo-you |
| Contributors | Ker-Chang Hsieh, Jacob C. Huang, Po-We Kao |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721111-215031 |
| Rights | not_available, Copyright information available at source archive |
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