Surface modification of γ-TiAl alloys by acetylene plasma deposition

Surfaces of two γ-TiAl alloys, Ti-47 at% Al-2at% Nb-2 at% Cr (MJ12) and Ti-47 at% Al-2 at% Nb-2 at% Mn + 0.8 at% TiB2 (MJ47), have been modified by acetylene plasma deposition at bias voltages of -4, -5 and -6 kV for 3.6 × 103 s (1 h) and 1.44 × 104 s (4 h). Knoop hardness (HK) of the alloys is incr...

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Main Authors: Narksitipan S., Thongtem T., McNallan M., Thongtem S.
格式: Article
語言:English
出版: 2014
在線閱讀:http://www.scopus.com/inward/record.url?eid=2-s2.0-33748980224&partnerID=40&md5=fe49369192b4b2b23e66e3ef25f35812
http://cmuir.cmu.ac.th/handle/6653943832/5066
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機構: Chiang Mai University
語言: English
實物特徵
總結:Surfaces of two γ-TiAl alloys, Ti-47 at% Al-2at% Nb-2 at% Cr (MJ12) and Ti-47 at% Al-2 at% Nb-2 at% Mn + 0.8 at% TiB2 (MJ47), have been modified by acetylene plasma deposition at bias voltages of -4, -5 and -6 kV for 3.6 × 103 s (1 h) and 1.44 × 104 s (4 h). Knoop hardness (HK) of the alloys is increased with the increase of bias voltage and prolonged time for the deposition. HK of MJ12 and MJ47 deposited at -6 kV for 1.44 × 104 s is, respectively, 3.36 and 3.32 times as hard as the untreated alloys. SEM and AFM analyses show that the deposited alloys compose of a number of nano-dots which reflect their surface properties. The phases analyzed by XRD are in accord with the elements analyzed by EDX. © 2005 Elsevier B.V. All rights reserved.