MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Investigation of the Characteristics of Submicron-Structured Powder-Fabricated Cr50Ni50 Alloys via Different Hot-Press Sintering Pressures
Shih-Hsien ChangCheng-Liang LiaoKuo-Tsung HuangMing-Wei Wu
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2016 Volume 57 Issue 5 Pages 732-737

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Abstract

In this study, two different compositions of submicron-structured chromium and nickel powders are mixed to fabricate Cr50Ni50 alloys by vacuum hot-press sintering. The research imposes various hot-press sintering pressures (12, 24, 36 and 48 MPa), while the temperature is maintained at 1275℃ for 1 h, respectively. The experimental results show the optimum parameters of the hot-press sintered Cr50Ni50 alloys to be 1275℃ at 48 MPa for 1 h. The relative density reaches 96.29%, and the hardness and electrical conductivity increase to 75.2 HRA and 2.01 × 104 Scm−1, respectively. Simultaneously, the transverse rupture strength (TRS) value increases to 1109 MPa. Moreover, the Cr50Ni50 alloys dramatically acquire a more homogeneous microstructure, and the mean grain size decreases to 3.48 μm. Consequently, it is shown that hot-press sintering has a positive influence on the sintering behavior and improves the performance of the refractory metals.

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© 2016 The Japan Institute of Metals and Materials
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