Material Processing
Jie Yu; Maosheng Zheng
Abstract
Parameter design of material processing is quite significant to provide a safeguard to the quality of product comprehensively in condition of clean production especially. In this paper, an appropriate approach of parameter design of materials processing is proposed in term of probabilistic multi-objective ...
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Parameter design of material processing is quite significant to provide a safeguard to the quality of product comprehensively in condition of clean production especially. In this paper, an appropriate approach of parameter design of materials processing is proposed in term of probabilistic multi-objective optimization (PMOO). The approach has the characteristic of concurrent optimization of multiple objectives in spirit of probability theory inherently; furthermore the “sequential number-theoretic optimization (SNTO)” is employed to conduct the discretization of successive deep optimization. Besides, the optimal design of materials processing is completed by conducting the assessment of total preferable probability for each scheme. Subsequently, parameter design problems of grinding processes of H7007C bearing inner ring with energy saving and emission reduction, and processing optimization of aluminum alloy AA 6082 blank hot stamping, are taken as examples to illuminate the procedure of the approach, respectively. The results show the rationality of the approach. It has a bright prospect in parameter design of production optimization in the future.

Material Processing
Ajay Kumar Baranwal; D P Mondal; Rajeev Kumar
Abstract
Lightweight Ni-Ti alloy foam has received immense attention as a promising material for sensors, actuators, dampers, biomedical implants, and energy absorption applications due to their outstanding properties including low density, high surface area, corrosion resistance and excellent mechanical strength. ...
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Lightweight Ni-Ti alloy foam has received immense attention as a promising material for sensors, actuators, dampers, biomedical implants, and energy absorption applications due to their outstanding properties including low density, high surface area, corrosion resistance and excellent mechanical strength. In the present study, we developed Ni (50)-Ti (50) alloy foams with varying porosities using NaCl as a space holder. The cold compacted mixture of NiTi alloy powder, NaCl granules, and 2 wt% polyvinyl alcohol (PVA) solutions are mixed uniformly in a globe box for 8 hrs. Sintering is carried out in two stages: firstly, at 900 oC for 2 hrs and then at 1100 oC for two hrs. During sintering, NaCl gets melted and removed from the foams. The Ni-Ti alloy foams exhibit an excellent compressive strength of 48 MPa at a relative density (ρrd) of 0.45. It also provides higher plateau stress, greater strain hardening effect, and larger strain recovery. Thus, the lightweight high strength Ni-Ti alloy foam is a promising material for bone implants and energy absorption applications.

Material Analysis
Sourav Singha Roy; Sriparna Sarkar; Debashis Chakraborty
Abstract
The limited availability of fossil fuels on the Earth has led researchers to develop new materials that are derived from renewable feedstocks. The polymers produced from the ROP of cyclic esters like (LA and ɛ-CL) are biodegradable, biocompatible, and bioassimilable and thus find major applications ...
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The limited availability of fossil fuels on the Earth has led researchers to develop new materials that are derived from renewable feedstocks. The polymers produced from the ROP of cyclic esters like (LA and ɛ-CL) are biodegradable, biocompatible, and bioassimilable and thus find major applications in various field. The ROP are catalyzed by the metal-based organometallic catalyst and metal-free organocatalyst. This review exemplifies the living and immortal ROP. The advantage of such polymerization is that they produce polymers with controlled molecular weight distribution. For the immortal ROP, more than one polymer chain grows from the single catalytic site in the presence of chain transfer agents (CTAs), and thus catalyst loading is low, which make the process economically more viable. The nature of CTAs and loading of CTAs with respect to the catalyst is crucial as the catalyst should be effective in the presence of CTAs. The review also discusses functionalized CTAs employed for the polymerization in some instances where functionalized polymers are generated.
