scholarly journals Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4075 ◽  
Author(s):  
Pavel Salvetr ◽  
Jaromír Dlouhý ◽  
Andrea Školáková ◽  
Filip Průša ◽  
Pavel Novák ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Shape Memory ◽  
Spark Plasma Sintering ◽  
Scanning Calorimetry ◽  
Slow Cooling ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Heat Treated ◽  
Spark Plasma

Ni-Ti alloys are considered to be very important shape memory alloys with a wide application area including, e.g., biomaterials, actuators, couplings, and components in automotive, aerospace, and robotics industries. In this study, the NiTi46 (wt.%) alloy was prepared by a combination of self-propagating high-temperature synthesis, milling, and spark plasma sintering consolidation at three various temperatures. The compacted samples were subsequently heat-treated at temperatures between 400 °C and 900 °C with the following quenching in water or slow cooling in a closed furnace. The influence of the consolidation temperature and regime of heat treatment on the microstructure, mechanical properties, and temperatures of phase transformation was evaluated. The results demonstrate the brittle behaviour of the samples directly after spark plasma sintering at all temperatures by the compressive test and no transformation temperatures at differential scanning calorimetry curves. The biggest improvement of mechanical properties, which was mainly a ductility enhancement, was achieved by heat treatment at 700 °C. Slow cooling has to be recommended in order to obtain the shape memory properties.

Spark Plasma Sintering of Mechanically Activated Ni and Al Powders

2014 ◽  
Vol 1040 ◽  
pp. 772-777 ◽  
Author(s):  
Lilia I. Shevtsova ◽  
Michail A. Korchagin ◽  
Alexander Thömmes ◽  
Vyacheslav I. Mali ◽  
Alexander G. Anisimov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Spark Plasma Sintering ◽  
Temperature Synthesis ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Ni Powder ◽  
Spark Plasma ◽  
Paper Structure ◽  
Sintered Materials

In this paper structure and mechanical properties of Ni3Al intermetallic compound was studied. The materials was fabricated according to different schemes, which combined mechanical alloying of Ni and Al powders, self-propagating high temperature synthesis (SHS) and spark plasma sintering (SPS). Relative density of all sintered samples was ~ 97 %. Microhardness of the sintered materials ranged from 6100 to 6300 MPa. SPS of 86.71 % wt. Ni and 13.29 % wt. Ni powder at 1100 °C led to formation of material with the highest level of tensile strength equal to 400 MPa.

K-0406 Fabrication of Ti-Ni-Cu Shape Memory Alloy by Spark-Plasma Sintering and Its Thermo-Mechanical Properties

2001 ◽  
Vol I.01.1 (0) ◽  
pp. 91-92
Author(s):  
Masakazu YOKOTA ◽  
Hideki KYOGOKU ◽  
Shinichiro KOMATSU ◽  
Fusahito YOSHIDA ◽  
Toshio SAKUMA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma

Influences of Ni content on Thermo-Mechanical Properties of Ti-Ni Shape Memory Alloy by Spark-Plasma Sintering

2000 ◽  
Vol 2000.3 (0) ◽  
pp. 333-334
Author(s):  
Toyoaki TANBO ◽  
Hideki KYOGOKU ◽  
Shinichiro KOMATSU ◽  
Toru WATANABRE ◽  
Fusahito YOSHIDA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Spark Plasma Sintering ◽  
Ni Content ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Mechanical properties of phase-pure bulk Ta4AlC3 prepared by spark plasma sintering and subsequent heat treatment

2021 ◽  
Vol 15 (3) ◽  
pp. 211-218
Author(s):  
Guobing Ying ◽  
Cong Hu ◽  
Lu Liu ◽  
Cheng Sun ◽  
Dong Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Treatment Time ◽  
Raw Materials ◽  
Subsequent Heat Treatment ◽  
Plasma Sintering ◽  
Spark Plasma

High-purity and bulk Ta4AlC3 ceramics were successfully fabricated by spark plasma sintering (SPS) and subsequent heat treatment, using the raw materials including TaC and Ta2AlC powders. These raw materials were first synthesized by self-propagation high temperature synthesis from elements tantalum, aluminium and carbon black powders, followed by pressure-less sintering. The as-fabricated bulk Ta4AlC3 was relatively stable when subjected to heat treatment at elevated temperature of 1500?C. Moreover, prolonging the heat treatment time resulted in bigger grain sizes and higher densities of the Ta4AlC3. The flexural strength and the fracture toughness of the Ta4AlC3 fabricated by SPS were found to be 411MPa and 7.11MPa?m1/2, respectively. After the heat treatment at 1500?C for 8 h, the flexural strength and the fracture toughness of the Ta4AlC3 could reach 709MPa and 9.23MPa?m1/2, respectively. The special structural characteristics of the ternary ceramics and the increase of density after the heat treatment are the main reasons for the variation in mechanical properties of ternary ceramics.

Comparison of the mechanical properties of "BK6" hard alloys obtained by the traditional method and by spark plasma sintering

2019 ◽  
pp. 55-62
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Spark Plasma Sintering ◽  
Traditional Method ◽  
Thin Sheet ◽  
Hard Alloys ◽  
Power Drive ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Th 1

The existing multi-link power drives from thermally thin power elements from a TH-1 alloy with shape memory are analyzed. An effective method for assembling a unit of power elements and the use of a multi-link power drive in a laboratory press for separating thin-sheet blanks are pro¬posed.

Effect of Heat Treatment Temperature on the Mechanical Property in Cast TiNi Shape Memory Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 1493-1496
Author(s):  
Kazuhiro Kitamura ◽  
Yutaka Sawada ◽  
Toshio Kuchida ◽  
Tadashi Inaba ◽  
Masataka Tokuda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Tensile Test ◽  
Shape Memory ◽  
Treatment Temperature ◽  
Scanning Calorimetry ◽  
Temperature Synthesis ◽  
Treatment Conditions ◽  
High Temperature Synthesis

The heat treatment effect of a cast shape memory alloy (SMA) from self-propagating high temperature synthesis (SHS) ingot was investigated. The composition of SHS ingot was Ti-50.8at%Ni. DSC and Tensile test specimens were cast by lost-wax process from SHS ingot. The heat treatment conditions were 400°C-60min., 500°C-60min. and 600°C-60min. for DSC and 400°C-60min. and 500°C-60min. for tensile test. Transformation temperatures were measured by differential scanning calorimetry (DSC). Mechanical properties were measured by a tensile test at several temperatures. The effects of heat treatment temperatures were same as a general TiNi wire material.

scholarly journals Microstructure and Mechanical Properties of Ti-Nb Alloys Prepared by Mechanical Alloying and Spark Plasma Sintering

2019 ◽  
Vol 29 (3) ◽  
pp. 1445-1452 ◽  
Author(s):  
Damian Kalita ◽  
Łukasz Rogal ◽  
Tomasz Czeppe ◽  
Anna Wójcik ◽  
Aleksandra Kolano-Burian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Recoverable Strain ◽  
Α Phase ◽  
Plasma Sintering ◽  
Nb Content ◽  
Spark Plasma ◽  
Sintered Alloys

Abstract The effect of Nb content on microstructure, mechanical properties and superelasticity was studied in Ti-Nb alloys fabricated by powder metallurgy route using mechanical alloying and spark plasma sintering. In the microstructure of the as-sintered materials, undissolved Nb particles as well as precipitations of α-phase at grain boundaries of β-grains were observed. In order to improve the homogeneity of the materials, additional heat treatment at 1250 °C for 24 h was performed. As a result, Nb particles were dissolved in the matrix and the amount of α-phase was reduced to 0.5 vol.%. Yield strength of the as-sintered alloys decreased with Nb content from 949 MPa for Ti-14Nb to 656 MPa for Ti-26Nb, as a result of the decreasing amount of α-phase precipitations. Heat treatment did not have a significant effect on mechanical properties of the alloys. A maximum recoverable strain of 3% was obtained for heat-treated Ti-14Nb, for which As and Af temperatures were − 12.4 and 2.2 °C, respectively.

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