Affiliation of Author(s):

冶金工程学院

Journal:

Materials Characterization

Key Words:

La-TZM alloy Strengthening mechanism Second phase Microstructure Powder metallurgy

Abstract:

The strength of alloys can be significantly enhanced by the incorporation of second phase. In this work, a novel high-strength La-TZM alloy was designed and prepared via multicomponent second phase. It is reported herein that the strengthening mechanism of La-TZM alloy is mainly regulated by the Orowan mechanism, where the critical phase transformation size (dC) of the second phase is inversely proportional to the interfacial energy (γ) between the matrix and the second phase. Microstructure characterization has revealed that most of the second phase particles in La-TZM alloy exceed the critical size, indicating that La-TZM alloy is mainly strengthened through the Orowan mechanism. The yield strength (YSP) exhibits a positive correlation with the volume fraction of second phase, and it initially increases and subsequently decreases as the size of second phase particles in creases. As a result, compared with the conventional TZM alloy, the La-TZM alloy prepared in this study exhibits an 85.3 % enhancement in tensile strength. This research not only furnishes a theoretical foundation but also offers technical support for the extensive application of high-strength molybdenum (Mo) alloys in major engi neering fields, thereby holding significant theoretical and practical implications.

Co-author:

储祁佳,杨子鑫,wanghua,徐刘杰,Eric Wang,冯锐,Kuaishe Wang

Indexed by:

Journal paper

Correspondence Author:

xinghairui,房永强,huping

Volume:

228（2025）115433

ISSN No.:

1044-5803

Translation or Not:

no

Date of Publication:

2025-01-01