SUPERPLASTICITY OF A MO-9SI-8B-3HF MULTIPHASE REFRACTORY ALLOY PREPARED BY MECHANICAL ALLOYING AND HOT PRESSING SINTERING

Acta Metall Sin

2011, Vol. 47

Issue (3): 317-320 DOI:

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SUPERPLASTICITY OF A MO-9SI-8B-3HF MULTIPHASE REFRACTORY ALLOY PREPARED BY MECHANICAL ALLOYING AND HOT PRESSING SINTERING

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No Author. SUPERPLASTICITY OF A MO-9SI-8B-3HF MULTIPHASE REFRACTORY ALLOY PREPARED BY MECHANICAL ALLOYING AND HOT PRESSING SINTERING. Acta Metall Sin, 2011, 47(3): 317-320.

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Abstract The demand for materials suitable for elevated temperature applications in the aircraft and aerospace industry beyond the realm of Ni-base superalloys has generated significant research interest in refractory metals and alloys, intermetallics and ceramics. The lack of damage tolerance in many intermetallics and most ceramics has guided research in the direction of multiphase refractory alloys which contained a matrix phase that is capable of providing damage tolerance, and a significant volume fraction of second phase that enhances the creep resistance of the alloy. Mutiphase Mo-Si-B alloys comprised of a α-Mo (Mo solid solution) and the intermetallic phases Mo3Si and Mo5SiB2 appear to offer favorable combinations of mechanical properties and oxidation resistance. It is widely accepted that the ideal microstructure of Mo-Si-B alloys would possess a continuous α-Mo matrix with embedded, homogeneously distributed intermetallic particles. For optimum toughening, microstructures containing a continuous matrix of the toughening phase are preferred over those in which the toughening phase occurs in the form of discrete particles. One purpose of this paper is to show that mechanical alloying (MA) in the solid state may be used to fabricate Mo-Si-B alloys with a continuous α-Mo matrix. One of the major drawbacks for hindering applications of Mo-Si-B alloys is poor formability even at elevated temperauture. Superplasticity which has the advantages of precision forming to the final net shape is a viable method to overcome this problem. The main purpose of this paper is to report the extensive plasticity or superplasticity of Mo-9Si-8B-3Hf alloy. A Mo-9Si-8B-3Hf multiphase refractory alloy was prepared by mechanical alloying (MA)and hot pressing sintering. Influence of milling time on density was studied. The tensile properties of this alloy at elevated temperature were evaluated by tensile tests in vacuum. Analysis of XRD reveals that this alloy consists of α-Mo (Mo solid solution), intermetallics Mo3Si and Mo5SiB2. The average grain sizes of each phase are all about 3μm and the grains shapes are nearly equiaxed. This alloy displayed extensive plasticity or superplasticity at temperatures ranging from 1400 ℃to 1560 ℃with strain rate of 3×10-4 s-1.

Key words: Mo–Si–alloy intermetallc mechnical alloying superplasticity grain boundary sliding

Received: 27 September 2010

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	YU Ji-Liang
	LI Zhong-Kui
	ZHENG Xin
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	YU Hui
	YU Wen-Sheng

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2011/V47/I3/317

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