Strain ageing in γ(TiAl)-based and α2(Ti3Al) titanium aluminides

The effect of microstructure and strain rate on the 25 °C and 700 °C compression deformation behavior of powder metallurgy processed Ti-45Al-2Nb-2Mn (at.%)-0.8 TiB2 (vol%) alloy

“…The true stress-strain values obtained from the compression tests were used to calculate the strain rate sensitivity (m). To determine this parameter, several methods can be used, such as determining the slope of the log (𝜎)-log (𝜀) from instantaneous values, changing the deformation rate, or by performing stress-relaxation tests [11][12][13][34][35][36][37][38].…”

“…γ-TiAl alloys exhibit a superplastic behaviour at temperatures higher than 1000ºC and low deformations [10]. This behavior can be separated into three sections as a function of temperature, as shown by U. Fröbel and Appel [11][12]. While these works were focused on the high-temperature deformation behavior, few studies have systematically investigated the mechanical behavior of TiAl alloys over a wide range of strain rates at room temperature (RT).…”

Research on strain aging behavior of ultra-high strength dual-phase steel

“…Except for some materials, such as interstitial free steel, in which interstitial carbon and nitrogen atoms were scavenged by titanium or niobium to achieve non-aging and no yield point phenomenon [ 4 ], the static strain aging phenomenon could be found in a variety of materials, including low carbon steel [ 5 , 6 ], low-alloy steel [ 7 ], dual phase steel [ 8 ], duplex stainless steel [ 9 ]. This phenomenon even exists in -titanium [ 10 ], titanium aluminum alloys [ 11 ], NiAl-based alloys [ 12 ], and many metal materials. The topic discussed in this paper mainly focuses on static strain aging.…”