Effect of Cold Rolling and Heat Treatment on Microstructure and Mechanical Properties of Pt-0.7Ti Microalloy

Abstract:

The effects of cold rolling, solid solution, aging and annealing treatment on Pt-0.7Ti microalloy were investigated in this study. The microstructures of Pt-0.7Ti microalloy and the precipitated ordered phase Pt₈Ti were observed and analyzed by OM, TEM, XRD. The mechanical properties of the alloy were evaluated Vicker micro-hardness. The results showed that micro amount of Ti was an effective element for solid-solution strengthening of Pt, the micro-hardness of 97% deformation for ST and ST+AG samples increased to 214HVand 224HV, respectively, which almost are double that of pure Pt. Micro-amount of long range ordered phase Pt₈Ti was precipitated during the heat treatment, but the effect of order hardening in Pt-0.7Ti microalloy was not obvious. The microhardness by large rolling deformation for quenched samples almost unchanged after an annealing below 500°C for 1h, but decreased significantly at 700°C, and the recrystallization temperature was risen by 200°C than that of pure Pt.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 645-650
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.645
• Online since: April 2015
• Authors: Qiong Zhao, Xiao Ge Zhang, Ye Fan, Guo Yi Qin*, Si Yong Xu, Jin Xin Gu
• Keywords: Cold Rolling, Heat Treatment, Microhardness, Microstructure, Pt-Ti Microalloy

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