Effects of Trace ZrC on the Microstructure and Properties of Molybdenum Alloy

Abstract:

The present study describes the effect of trace ZrC additive on the microstructure and properties of Mo-Ti-Zr alloy fabricated by powder metallurgy method. The results indicate that, ZrC addition effectively enhanced the tensile strength of the alloy both at room-temperature and high-temperature, the alloy with 0.4wt% ZrC has the highest tensile strength, which is 611MPa and 513MPa at 25°C and 800°C, respectively. The tensile fracture mainly consists of intergranular rupture at room temperature, while dimple fracture occurred at high temperature, which indicating higher elongation. Through observation from the micrograph and EDS analysis, ZrxOyCz second-phase particles were observed,which is derived from part of ZrC particles reacted with the oxygen and can suppress the oxygen segregation on grain boundary.

• Periodical: Advanced Materials Research (Volumes 785-786)
• Pages: 76-80
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.785-786.76
• Online since: September 2013
• Authors: Hui Chao Cheng, Jinglian Fan, Zhao Qian, Tian Ju Ma
• Keywords: Dimple Fracture, Intergranular Rupture, Mo-Ti-Zr Alloy, Second Phase Particles, Tensile Strength

References

[1] Hiroaki Kurishita, Yuji Kitsunai, Tamaki Shibayama, Hideo Kayano and Yutaka Hiraoka. Development of Mo alloys with improved resistance to embrittlement by recrystallization and irradiation,. Journal of Nuclear Materials(1996) 557~564.

DOI: 10.1016/s0022-3115(96)00333-9

[2] Jinglian Fan, Mingyuan Lu, Huichao Cheng, Jiamin Tian and Boyun Huang. Effect of alloying elements Ti, Zr on the property and microstructure of molybdenum,. Int. Journal of Refractory Metals & Hard Materials (2009)78-82.

DOI: 10.1016/j.ijrmhm.2008.03.006

[3] B.V. Cockeram. The mechanical properties and fracture mechanisms of wrought low carbon arc cast (LCAC), molybdenum-0. 5pct titanium-0. 1pet zirconium (TZM), and oxide dispersion strengthened (ODS)molybdenum,. Materials Science and Engineering A (2006).

DOI: 10.1016/j.msea.2005.11.030

[4] Takeshi Inoue, Yutaka Hiraoka, Ei-ichi Sukedai, Masahiro Nagae and Jun Takada. Hardening behavior of dilute Mo-Ti alloys by two-step heat-treatment,. International Journal of Refractory Metals and Hard Materials (2007)138-143.

DOI: 10.1016/j.ijrmhm.2006.03.005

[5] T. Mrotzek, A. Hoffmann and U. Martin. Hardening mechanisms and recrystallization behaviour of several molybdenum alloys. International Journal of Refractory Metals & Hard Materials (2006) 298-305.

DOI: 10.1016/j.ijrmhm.2005.10.003

[6] S. Majumdar, R. Kapoor, S. Raveendra, H. Sinha, I. Samajdar, P. Bhargava, J.K. Chakravartty, I.G. Sharma and A.K. Suri. A study of hot deformation behavior and microstructural characterization of Mo–TZM alloy,. Journal of Nuclear Materials(2009).

DOI: 10.1016/j.jnucmat.2008.12.049

[7] Sean E. Landwehr, Gregory E. Hilmas, William G. Fahrenholtz, Inna G. Talmy and Stephen G. Dipietro. Microstructure and mechanical characterization of ZrC-Mo cermets produced by hot isostatiic pressing,. Materials Science and Engineering A(2008).

DOI: 10.1016/j.msea.2008.07.017