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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

年間 4 号発行

ISSN 印刷: 1093-3611

ISSN オンライン: 1940-4360

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00005 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.07 SJR: 0.198 SNIP: 0.48 CiteScore™:: 1.1 H-Index: 20

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THE WIRE ELECTRO-DISCHARGE MACHINING CHARACTERISTICS OF TiNi SHAPE MEMORY ALLOYS

巻 4, 発行 4, 2000, 10 pages
DOI: 10.1615/HighTempMatProc.v4.i4.20
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要約

The wire electro-discharge machining (WEDM) characteristics of TiNi shape memory alloys (SMAs) have been investigated in this study. The maximum feeding rate without breakage of wire electrode increases with increasing pulse duration τP for the TiNi SMAs. The wire electrode will easily break off if the pulse duration τP raises up to 0.7-0.8 μs due to the excessive discharge energy produced in the over-long pulse duration. The maximum feeding rate of wire electrode has a reverse relationship to the product of the melting temperature (λ) and thermal conductivity (θ) of machined materials. Besides, longer pulse duration τP will have rougher WEDM surfaces of TiNi SMAs. Many electro-discharge craters and re-cast materials are observed in the WEDM surface of TiNi SMAs. The re-cast layer consists of the oxides TiO2, TiNiO3 and the deposition particles of consumed brass electrode. The thickness of re-cast layer decreases with increasing pulse duration τP. The specimen's hardness near the outer surface can reach 730 Hv for TiNi SMAs. This hardening effect arises from the formation of the oxides TiO2, TiNiO3 and the deposition particles of consumed electrode in the re-cast layer. The WEDM TiNi SMAs still exhibit a nearly perfect shape recovery at a normal bending strain, but a slightly reduced shape recovery at a higher bending strain due to the depression of the re-cast layer. All the Ti49Ni51, Ti50Ni50 and Ti50Ni40Cu10 SMAs exhibit similar WEDM characteristics although they have different crystal structures and mechanical properties at room temperature.

によって引用された
  1. Gaikwad Mahendra U, A Krishnamoorthy, Jatti Vijaykumar S, Investigation and Optimization of Process Parameters in Electrical Discharge Machining (EDM) Process for NiTi 60, Materials Research Express, 6, 6, 2019. Crossref

  2. Liu J.F., Li L., Guo Y.B., Surface Integrity Evolution from Main Cut to Finish Trim Cut in W-EDM of Shape Memory Alloy, Procedia CIRP, 13, 2014. Crossref

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