Spinodal strain glass in Mn-Cu alloys

The Mechanical and Functional Behaviors of Mn–15 wt%Cu Alloy Produced by Selective Laser Melting

“…The wavelength of the compositional modulation was ≈20 nm, which was consistent with 5–20 nm of nanoscale composition modulations in its early stage of spinodal decomposition for Mn 60 Cu 40 (at%). [ 19 ] Therefore, the nanoscale enrichment of the two elements can be set apart from each other based on the composition modulation curves (Figure 6d), providing direct evidence for spinodal decomposition that occurred during the SLM process in the alloy. The Mn‐rich zone produced by spinodal decomposition can increase the Mn concentration in the localized area to increase the M S and induce martensite transformation in the alloys.…”

“…The Mn‐rich zone produced by spinodal decomposition can increase the Mn concentration in the localized area to increase the M S and induce martensite transformation in the alloys. As is well known, spinodal decomposition is the basis of the strain glass transition, [ 19 ] damping capacity, and shape memory effect of the alloy. [ 32 ]…”

“…The Mn-rich zone produced by spinodal decomposition can increase the Mn concentration in the localized area to increase the M S and induce martensite transformation in the alloys. As is well known, spinodal decomposition is the basis of the strain glass transition, [19] damping capacity, and shape memory effect of the alloy. [32] In Figure 7a, the ultimate tensile strength, yield strength, microhardness, and elongation (El) of the as-SLMed alloys were 359, 268 MPa, 149 HV, and 3.6%, respectively.…”

“…Thus, highmanganese Mn-Cu alloys have low plasticity and poor machinability. So, the Mn-Cu alloys having a concentration of Mn within 40-80 at% [4,9,10,[18][19][20][21] are the mainstay during the development of the alloy, taking the trade-off between the mechanical and functional properties into consideration. Only a few research studies have explored the manufacture of high-manganese Mn-Cu alloys [22,23] by conventional casting, forging, and machining methods, as well as their mechanical and functional properties.…”

Multifunctional High Entropy Alloys Enabled by Severe Lattice Distortion

“…Further studies demonstrated that a reduced lattice distortion, which is revealed through alloying Fe into the Elinvar alloy (CoNi) 50 (TiZrHf) 50 , indeed induces a decline in the Elinvar effect (Figure 8b). In addition, the temperature range of the lattice distortion‐induced Elinvar effect is wider than that for the Gum metal (Ti 73.2 Nb 23 Ta 0.7 Zr 2 O 1.2 ), [ 111 ] Fe 63.4 Mn 30.62 Si 5.31 C 0.67 , [ 37 ] and the strain glass alloys (i.e., Ti 49.2 Ni 50.8 [ 122 ] and Mn 60 Cu 40 [ 123 ] ), as shown in Figure 8c.…”