Improved deformation behavior in Ti-Zr-Fe-Mn alloys comprising the C14 type Laves and β phases. (15th December 2018)

• Record Type: Journal Article
• Authors: Rabadia, C.D.; Liu, Y.J.; Jawed, S.F.; Wang, L.; Li, Y.H.; Zhang, X.H.; Sercombe, T.B.; Sun, H.; Zhang, L.C.
• Is Part Of: Materials & design. Volume 160(2018)
• Page Start: 1059
• Page End: 1070
• Publication Date: 2018-12-15
• Subjects: Laves phase -- Titanium alloy -- Deformation -- Mechanical strength -- Fracture analysis -- Shear band; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2018.10.049
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Laves phase alloys are promising materials for several structural applications, but the extreme brittleness is the predominant shortcoming of a Laves matrix. One potential solution to overcome this shortcoming is to alloy Laves matrix with some soft matrix. A group of Ti-35Zr-5Fe-xMn (x = 0, 2, 4, 6, 8 wt%) alloys was cast with an aim to improve deformation in Laves alloy compositions. The phase and microstructure analyses reveal dual phase matrices, including a β phase and a C14 type Laves phase in the investigated alloys. The mechanical properties such as yield strength, hardness and plastic strain for the investigated alloys are found to be significantly sensitive to volume fraction of the Laves phase. Ti-35Zr-5Fe shows impressive ultimate compressive strength (~1.7 GPa), yield strength (1138 MPa) and large plastic strain (23.2 %). The fracture mechanisms are dependent on the microstructure of the alloys. Additionally, the work-hardening ability of the investigated alloys have also been evaluated based on the analyses of slip band patterns formed around the micro-hardness indentations. Notably, the extreme brittleness is not encountered in all the Ti-35Zr-5Fe-xMn alloys and all exhibit very good compressive elongation including the maximum (32.5 %) in Ti-35Zr-5Fe. Graphical abstract: Highlights: The C14 type Laves phase is formed in all the Ti-35Zr-5Fe-xMn alloys. Yield strength, hardness and plastic strain are affected by the content of Mn. Plastic strain correlates inversely with the size of dimples formed on fractured surfaces. Ti-35Zr-5Fe displays impressive elongation (32.5%), ultimate strength (~1.7 GPa) and yield strength (~1.1 GPa).