@misc{liu_effect_of_2014, 
author={Liu, J., Ventzke, V., Staron, P., Schell, N., Kashaev, N., Huber, N.},
title={Effect of Post-weld Heat Treatment on Microstructure and Mechanical Properties of Laser Beam Welded TiAl-based Alloy},
year={2014},
howpublished = {journal article},
doi = {https://doi.org/10.1007/s11661-013-1886-5},
abstract = {Post-weld heat treatment is carried out on the laser beam welded γ-TiAl-based alloy Ti-48Al-1Cr-1.5Nb-1Mn-0.2Si-0.5B (at. pct). The macro/microstructure and mechanical properties of both as-welded and heat-treated specimens are investigated by radiography, SEM, and tensile tests. Moreover, high energy synchrotron X-ray diffraction is performed to measure the residual stresses and evaluate the microstructure evolution. It is found that the residual stresses are distributed in a three-peak shape in the region of the weld zone and heat-affected zone of the as-welded specimen due to the microstructural transformation and heat softening. The residual stresses are largely relieved after the heat treatment. The heat-treated specimens have a near fully lamellar microstructure and show balanced mechanical properties of strength and ductility. The diffraction shows that the phase transformation from α2 to γ takes place under tensile load at 1023 K (750 °C), and the grain size and lamellar spacing are refined in the weld zone. Finally, the fracture mechanisms are found to be controlled by the local stress concentration-induced strain misfit between α2 and γ phases in the near γ grains and delamination and debonding in the lamellae. Boride ribbons of 5 μm in the near fully lamellar microstructure are found not to be detrimental to the tensile properties.},
note = {Online available at: \url{https://doi.org/10.1007/s11661-013-1886-5} (DOI). Liu, J.; Ventzke, V.; Staron, P.; Schell, N.; Kashaev, N.; Huber, N.: Effect of Post-weld Heat Treatment on Microstructure and Mechanical Properties of Laser Beam Welded TiAl-based Alloy. Metallurgical and Materials Transactions  A. 2014. vol. 45, no. 1, 16-28. DOI: 10.1007/s11661-013-1886-5}}