A detailed model of the role of asperities in crack closure has been initiated in Part 1 of this article. Crack opening stress is defined as the far-field stress required to overcome the asperity-induced contact stresses along the crack. In this Part 2, the magnitude of crack opening stress is established as a function of roughness (s0); asperity density (N); maximum stress level (Smax/Sy); sha...

Ti-4Al-5Mo-5V-5Cr-1Nb (wt.%) is a new type of high-strength (~1300 MPa) titanium (Ti) alloy developed for aerospace applications. Until now, the research on its welding and subsequent heat treatment barren. Herein, we employed electron beam (EBW) to solutionized with phase constituent α + β investigated microstructure mechanical properties in both as-welded (AW) post-weld aging treated (PWAT) c...

The paper studies the influence of 0.5–1.8 wt.% Ni alloying on superplasticity, microstructural evolution, and dynamic grain growth effect in a temperature range 625–775 °C room mechanical properties two-phase Ti-Al-Mo-V alloys. Due to decrease β transus an enhancement alloy diffusivity, increase content significantly improved superplasticity. Ni-modified alloys exhibited 1.5–3-fold lower flow ...