A 4D printing method for a titanium-nickel shape memory alloy, and the titanium-nickel shape memory alloy and application thereof. Pure titanium and pure nickel are mixed and smelted, and titanium-nickel alloy bars are obtained; then alloy powder is prepared by means of a rotating electrode atomization method, the powder is sieved, and titanium-nickel alloy powder having a grain size of 15-53 μm is obtained; and the obtained titanium-nickel alloy powder is placed in a discharge plasma auxiliary ball mill to be subjected to discharge treatment, the powder is subjected to surface modification, and finally the titanium-nickel shape memory alloy is formed by means of SLM forming. The phase composition of the titanium-nickel shape memory alloy is composed of a B2 austenite phase of a CsCl type structure, a B19′ Martensite phase of a monocline structure and a Ti.sub.2Ni precipitated phase. The microstructure of the memory alloy comprises nano-sized cellular-like crystals and micron-sized dendritic crystals, and the cellular-like crystals and the dendritic crystals are alternately distributed in a layered manner. The memory alloy has the characteristics of being unique in structure, nearly fully dense and ultrahigh in performance.

The present invention belongs to the field of additive manufacturing technology, and discloses a 4D printing method capable of in-situ regulating functional properties of nickel-titanium (NiTi) alloys and the application thereof. The method comprises the following steps: subjecting NiTi alloy bars to atomization milling to obtain NiTi alloy powder with a particle size of 15-53 μm, placing the NiTi alloy powder in a discharge plasma assisted ball mill for discharge treatment to promote the activation of powder activity, then adding nano-sized Ni powder with a particle size of 100-800 nm to obtain mixed powder, then continuing the discharge treatment to realize the metallurgical bonding between the NiTi alloy powder and the nano-sized Ni powder to obtain the modified powder, and finally using the additive manufacturing technology to prepare and form the modified powder into a functionalized NiTi alloy. The present invention achieves the metallurgical bonding between the nano-sized Ni powder and the large-sized spherical NiTi alloy powder by adding the nano-sized Ni powder in the process of discharge treatment, which is conducive to preparing a bulk alloy with uniform composition, structure and properties and the parts made therewith.

The present disclosure provides a cobalt-based alloy having self-healing property. The cobalt-based alloy has composition as below: [[Co.sub.aTi.sub.bCr.sub.100-a-b].sub.1-0.01cS.sub.c].sub.1-0.01dH.sub.d (57≤a≤92.5 at. %, 6≤b≤33 at. %, a+b<100, S means strengthening solute elements, 0<c≤20 at. %, H means healing solute elements, and 0<d≤2 at. %), wherein self-healing function is implemented by the healing solute elements.

A composition includes the constituents, in approximate weight percentages: Chromium 15-17; Silicon 2.5-3.5; Cobalt 6.0-8.0; Aluminum 1.0-2.0; Tantalum 1.5-2.5; Boron 1.5-2.5; Yttrium 0.015-0.025; Nickel balance; and incidental impurities.

Boron and silicon free braze alloys are useful for structural repair of superalloy gas turbine engine components. The braze alloy compositions include nickel, chromium, titanium, and at least one of zirconium and hafnium. All of the above elements are metallic and form ductile bonds within and across the braze interface when compared to non-metallic bonds of boron and silicon.

Provided is a thermoelectric conversion element having a high Anomalous Nernst Effect at a lower cost. A thermoelectric conversion element (1) includes a magnetic alloy material containing aluminum, cobalt, and samarium, and a power generation layer (10), in which in the power generation layer (10), a content of aluminum in the magnetic alloy material is in a range of 1 atomic percent to 40 atomic percent, a content of samarium in the magnetic alloy material is in a range of 12 atomic percent to 40 atomic percent, and a content of cobalt in the magnetic alloy material is in a range of 57 atomic percent to 82 atomic percent.

A method for producing a high temperature component includes a shaping step of shaping a powder compact of a desired high temperature component shape using a specific powder shaping method, from an alloy powder of γ′ precipitation strengthening-type Ni-based alloy, and a crystal grain coarsening step of coarsening a crystal grain size of the powder compact by heat treatment, wherein the powder compact contains 0.002% or more and 0.07% or less of C, and 5.40% or more and 8.40% or less of Al+Ti by mass percentage.

Proposed is a nitinol nanofiber with an average surface roughness that is enhanced through mechanical and chemical treatments. The enhanced surface roughness improves biocompatibility and promotes tissue growing, thereby improving the bioavailability of the nitinol nanofiber. The nitinol nanofiber undergoes infrared irradiation whereby the nitinol fiber exhibits improved tensile strength, elastic modulus, and maximum restorative stress. Therefore, fatigue fraction does not easily occur in the nitinol fiber even when the nitinol nanofiber has a constant roughness. The present invention provides bio-use or medical nitinol nanofibers that are highly biocompatible.

Provided herein is a novel process for producing shaped catalyst bodies in which a mixture having aluminum contents of Al.sup.±.sup.0 in the range from 80 to 99.8% by weight, based on the mixture used, is used to form a specific intermetallic phase, shaped catalyst bodies obtainable by the process of the invention, a process for producing an active catalyst fixed bed including the shaped catalyst bodies provided herein, the active catalyst fixed beds and also the use of these active catalyst fixed beds for the hydrogenation of organic hydrogenatable compounds or for formate degradation.

Embodiments disclosed herein related to superalloy compositions and applications using the same. The superalloy compositions disclosed herein including at least one ternary intermetallic compound having a general chemical composition of A.sub.Z[B.sub.XC.sub.Y]. Base element A is selected from the group consisting of cobalt, iron, and nickel; and element B and element C are independently selected from different members of a group consisting 40 elements of the periodic table. Base element A, element B, and element C are each different elements. Z is about 2.1 to about 3.9. X and Y are about 0.1 to about 1.9. Additionally, the at least one ternary intermetallic compound of each of the superalloy compositions exhibits the face-centered cubic structure L1.sub.2. The at least one ternary intermetallic compound of each of the ternary superalloy compositions may exhibit a theoretical formation enthalpy and a decomposition energy less than Co.sub.3[Al, W].