Effect of Pore Size on Mechanical Properties of Ti-6Al-4V Metal Foams Muhammad Hamza Ali Haider 1,2 and Muhammad Omer Farooq 3,4, 1 Ghulam Ishaq Khan Institute, Pakistan 2 Technische Universität Darmstadt, Germany , 3 Silesian University of Technology, Poland, 4 University of Granada, Spain