Microstructural evolution of nanostructure 7075 aluminum alloy during isothermal annealing

The microstructural evolution of a pre-alloyed AZ91 magnesium alloy powder through high-energy milling and subsequent isothermal annealing

“…A high lattice strain implies that the AZ91 powder particles went through severe plastic deformation during the HEM process and, as a result, contained a high density of microstructural defects. The values obtained for crystallite size and lattice strain are in good agreement with those previously reported for high-energy milled Al-based powders [10,16]. Various models have been proposed to describe the mechanism of formation of nanostructures by HEM [9].…”

Modelling of the Precipitated Phases and Properties of Al-Zn-Mg-Cu Alloys

“…2(a) it can be seen that a number of precipitated phases exist at the equilibrium state, among which the g phase and the S phase are the major phases, whilst the T phase only occurs when temperature is below 200°C. Other phases, such as Al 6 Mn, Al 7 Cu 2 Fe, Al 3 Fe and Al 2 Si, also form in the precipitation processes due to additions of minor alloying elements into the alloys as irremovable impurities. The major alloying elements, i.e.…”

“…[4] Some other minor additive elements and impurities such as Ti, Zr, Fe and Si will also influence the microstructure by forming intermetallic phases. [5][6][7] Thus, the balance of properties of 7xxx alloys can be optimized by microstructural modifications via alloy compositional variations and heat treatment changes. [8] In resent years, the use of thermodynamic modelling via the multi-platform software has been extensively applied to complex alloys of many types, including Al-based alloys.…”

Effects of Solution Atoms and Precipitates on Isochronal Annealing Behavior of Cold-Rolled Squeeze-Cast SiCw/Al Composites

“…AMCs containing discontinuous reinforcement, such as particulate, whisker or short fiber, are especially attractive because they can be readily shaped with conventional secondary metal-working techniques [1][2][3][4][5][6][7][8][9][10]. During such forming operations, AMCs may experience an appreciable amount of cold working, which may both influence their further forming operations and degrade mechanical properties, such as elongation to failure and fatigue resistance.…”

“…During such forming operations, AMCs may experience an appreciable amount of cold working, which may both influence their further forming operations and degrade mechanical properties, such as elongation to failure and fatigue resistance. Therefore, after forming operations it may be necessary to anneal the composites to recover their deformation ability and mechanical properties [7,[11][12][13][14][15][16][17][18]. To optimize forming operations and mechanical properties of AMCs, understanding the annealing behavior of plastically deformed AMCs is essential.…”