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Mechanical behavior of molybdenum disilicide-based alloys.

DE2001772831

Publication Date	2000
Personal Author	Misra, A.; Sharif, A.
Page Count	7
Abstract	We have investigated the mechanical behavior of the following single-phase polycrystalline alloys with the MoSi(sub 2) body-center tetragonal structure: MoSi(sub 2) alloyed with (approximately)2.5 at.% Re, MoSi(sub 2) alloyed with 2 at.% Al, MoSi(sub 2) alloyed with 1 at.% Nb, and MoSi(sub 2) alloyed with 1 at.% Re and 2 at.% Al. Several anomalies in the mechanical behavior of alloyed materials were observed. For example, (1) addition of only (approximately)2.5 at. % Re results in an order of magnitude increase in compressive strength at 1600 C, (2) additions of Nb and Al cause solution softening at near-ambient temperatures, and (3) quaternary MoSi(sub 2)-Re-Al alloys show strengthening at elevated temperatures and reduction in flow stress with enhanced plasticity at near-ambient temperatures in compression. The mechanisms of anomalous solution hardening and softening are discussed.
Keywords	Alloys Mechanical properties Compression Flow stress Hardening Molybdenum Plasticity
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Los Alamos National Lab., NM.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	W-7405-ENG-36

Mechanical behavior of molybdenum disilicide-based alloys.

Mechanical behavior of molybdenum disilicide-based alloys.
DE2001772831

Publication Date	2000
Personal Author	Misra, A.; Sharif, A.
Page Count	7
Abstract	We have investigated the mechanical behavior of the following single-phase polycrystalline alloys with the MoSi(sub 2) body-center tetragonal structure: MoSi(sub 2) alloyed with (approximately)2.5 at.% Re, MoSi(sub 2) alloyed with 2 at.% Al, MoSi(sub 2) alloyed with 1 at.% Nb, and MoSi(sub 2) alloyed with 1 at.% Re and 2 at.% Al. Several anomalies in the mechanical behavior of alloyed materials were observed. For example, (1) addition of only (approximately)2.5 at. % Re results in an order of magnitude increase in compressive strength at 1600 C, (2) additions of Nb and Al cause solution softening at near-ambient temperatures, and (3) quaternary MoSi(sub 2)-Re-Al alloys show strengthening at elevated temperatures and reduction in flow stress with enhanced plasticity at near-ambient temperatures in compression. The mechanisms of anomalous solution hardening and softening are discussed.
Keywords	Alloys Mechanical properties Compression Flow stress Hardening Molybdenum Plasticity
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Los Alamos National Lab., NM.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	W-7405-ENG-36