Images of Figure 3a via e to b by means of f, it can be observed that there is tiny change the grain size after annealing. The submicron m in the surface from the SMGTed samtistic on the grain size at a distance of 50 to 450 grains indicated by the Bergamottin manufacturer arrows in Figure 3 within the grain size just after annealing. The submicron grains indicated by the arrows in Figure show that grains did not coarsen shown in Figure four. The typical C for two h. The SMGT ples and A-SMGTed samples are inside the procedure of annealing at 400grain size of thestatistic three show that grains did not coarsen in the course of action of annealing at 400 for 2 h. The staof the grain size at a distance of 161 450 from 50 m depth in the surface, reand A-SMGT Zr-4 alloy is about 50 toand 164 nm atthe surface with the SMGTed samples tistic from the grain size at a distance of 50 to 450 m in the surface of the SMGTed samand A-SMGTed samples are four. The grain size The Imeglimin Purity & Documentation average grain increasing depth disspectively, as seen in Figureshown in Figure four. increases with the size from the SMGT and ples and A-SMGTed samples are shown in Figure 4. The average grain size with the SMGT A-SMGT Zr-4 alloy is about 161 SMGTednm at 50 depth in the surface,as outlined by tance in the surface for both and 164 samples and A-SMGTed samples, respectively, and A-SMGT Zr-4 alloy is about 161 and 164 nm at 50 m depth from the surface, reas noticed in Figure four. Figure 4. The grain size increases with all the escalating depth distance in the spectively, as observed in Figure four. The grain size increases together with the growing depth dissurface for each SMGTed samples and A-SMGTed samples, in accordance with Figure 4. tance in the surface for each SMGTed samples and A-SMGTed samples, based on Figure four.Figure two. The microstructures (a) as-received samples (CG Zr-4); (b) (b) the section of Zr-4 Zr-4 alloy after SMGT Figure 2. The microstructures of of (a) as-received samples (CG Zr-4); the cross cross section ofalloy immediately after SMGT (SMG(SMGTed Zr-4). Ted Zr-4).Figure 2. The microstructures of (a) as-received samples (CG Zr-4); (b) the cross section of Zr-4 alloy soon after SMGT (SMGTed Zr-4).Nanomaterials 2021, 11, x FOR PEER Assessment Nanomaterials 2021, 11,5 of 13 5 ofFigure 3. Microstructures of distinctive depths from the surface of SMGTed Zr-4 samples and A-SMGTed Zr-4 samples, Figure three. Microstructures of distinct depths in the surface of SMGTed Zr-4 samples and A-SMGTed Zr-4 samples, SMGTed: (a,c,e) and A-SMGTed (b,d,f). The arrows in (a,b) indicate the ultra-fined grains. SMGTed: (a,c,e) and A-SMGTed (b,d,f). The arrows in (a) and (b) indicate the ultra-fined grains.Nanomaterials 2021, 11, x FOR PEER Evaluation six of6 of6 ofanomaterials 2021, 11, x FOR PEER Critique Nanomaterials 2021, 11,(a)(b)Figure four. Statistical grain size of (a) SMGTed sample. (b) (b) A-SMGTed sample. (For Figure 3e,f, grain (a) size is taken as size of dislocation cells, as arrow indicates). Figure 4. size of (a) SMGTed of (a) SMGTed sample. (b) A-SMGTed sample. grain size is taken as Figure four. Statistical grain Statistical grain sizesample. (b) A-SMGTed sample. (For Figure 3e,f, (For Figure 3e,f, grainsize of size is 3.2. Compressive Residual cells, as taken as size of dislocation cells, as arrow indicates). dislocation Tension arrow indicates).Figure 5 shows the 3.2. Compressive Residual Strain 3.2. Compressive Residual Tension variation of axial residual anxiety with distinctive depths in the surface in the SMGTed and A-SMGTed Zr-4 alloys. Right after annealing treatment, the reFigur.