CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Effect of Heat Treatment on Borides Precipitation and Mechanical Properties of CoCrFeNiAl1.8Cu0.7B0.3Si0.1 High-Entropy Alloy Prepared by Arc-Melting and Laser-Cladding

H. Zhang ; H. Tang ; Y. Z. He ; J. L. Zhang ; W. H. Li ; Sheng Guo (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
JOM: The Member Journal of TMS (1047-4838). Vol. 69 (2017), 11, p. 2078-2083.
[Artikel, refereegranskad vetenskaplig]

Effects of heat treatment on borides precipitation and mechanical properties of arc-melted and laser-cladded CoCrNiFeAl1.8Cu0.7B0.3Si0.1 high-entropy alloys were comparatively studied. The arc-melted alloy contains lots of long strip borides distributed in the body-centered cubic phase, with a hardness about 643 HV0.5. Laser-cladding can effectively inhibit the boride precipitation and the laser-cladded alloy is mainly composed of a simple bcc solid solution, with a high hardness about 769 HV0.5, indicating the strengthening effect by interstitial boron atoms is greater than the strengthening by borides precipitation. Heat treatments between 800 degrees C and 1200 degrees C can simultaneously improve the hardness and fracture toughness of arc-melted alloys, owing to the boride spheroidization, dissolution, re-precipitation, and hence the increased boron solubility and nano-precipitation in the bcc solid solution. By contrast, the hardness of laser-cladded alloys reduce after heat treatments in the same temperature range, due to the decreased boron solubility in the matrix.



Denna post skapades 2017-10-31.
CPL Pubid: 252877

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Metallurgi och metalliska material

Chalmers infrastruktur