Property-Control of TiNi System Intermetallics and Their Characteristics

Matsugi, Kazuhiro; Kashiwagi, Takahiro; Choi, Yongbum; Sasaki, Gen

doi:10.2320/matertrans.f-m2011827

Cited by 5 publications

(4 citation statements)

References 40 publications

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“…Their values above 400 K were higher than ones of some TiNi intermetallic compounds, 2) which meant the achievement of initial objective. They can be called high-temperature shape memory alloys.…”

Section: Microstructures and Cclm Effectmentioning

confidence: 99%

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Compositional Optimization of β Type Titanium Alloys with Shape Memory Ability and Their Characteristics

et al. 2015

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The compositions of ¢ type Ti alloys having shape-memory ability above 400 K were proposed by alloying parameters used in the delectrons concept. They were both Ti-6Mo-2Al-1Sn and Ti-6Nb-3Mo which were designed for improvement of thermal stability in shape memory behavior of Ti-6Mo base alloy, preserving the tensile strength of 700 MPa. Their ingots without contamination from the used crucible were produced by cold crucible levitation melting. They consisted of ¢ and ¡AA phases after the cold roll and heat treatment, and their amounts were depended on values in the alloying parameters. The shape recovery rate of 40 and 25% was measured after 4 cycles in the loadingunloading tests in Ti-6Mo-2Al-1Sn and Ti-6Nb-3Mo, respectively. They showed the As temperature above 490 K and improvement of thermal stability because of a much smaller amount of ½ phase than Ti-6Mo. The alloys showed tensile strength of 682 to 718 MPa. These results were caused by exactly prediction of the phase stability, shape memory ability and tensile strength, using alloying parameters.

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Section: Microstructures and Cclm Effectmentioning

confidence: 99%

“…For alloys, the average values of Md and Bo are defined by taking the compositional average, and Mdt and Bot are denoted using eqs. (1) and (2 …”

Section: Alloy Design For the ¢ Alloys With Shape Memory Abilitymentioning

confidence: 99%

Compositional Optimization of β Type Titanium Alloys with Shape Memory Ability and Their Characteristics

et al. 2015

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“…Impurities or contaminants from the crucible and/or atmosphere would greatly affect the mechanical properties of Ti alloys [9,10]. Cold Crucible Levitation Melting (CCLM) technology offered an effective means of preventing contaminants from the crucible and efficiently managing the vacuum within the furnace [11,12]. The molten metals were raised by the eddy current of CCLM and were melted without contact with the crucible.…”

Section: Introductionmentioning

confidence: 99%

Design of Near α-Ti Alloys with Optimized Mechanical and Corrosion Properties and Their Characterizations

Ma,

Matsugi,

Liu

2024

Metals

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The designed alloy Ti-10.56%Al-2.08%Zr-0.80%Sn-0.88%Mo-0.51%Si (mol%), modified alloy Ti-10.81%Al-4.80%Zr-1.23%Sn-0.76%Cu-0.35%Si (mol%) and reference alloy Ti-10.52%Al-2.07%Zr-1.1%Sn-0.2%Mo-0.76%Si (mol%) with the same bond order (Bot) value of 3.49 and different d-orbital energy level (Mdt) values of 2.43, 2.42 and 2.42 were proposed and their mechanical and corrosion properties were compared in the present study. The ultimate tensile strength (σUTS) and fracture strain (ɛf) values of the three near α-Ti alloys at both as-cast and solution-treated conditions were 989 and 1118 MPa and 11.6% and 3.4% for the designed alloy, 993 and 1354 MPa with 13.5% and 2.3% for the modified alloy and 991 and 1238 MPa with 12.7% and 3.1% for the reference alloy, respectively. The thickness of corrosion layers of the solution-treated designed, modified and reference near α-Ti alloys after immersion in hot salts for 28.8 ks were measured at 3.06, 3.68 and 4.89 µm. The comparable mechanical properties and improved hot salt corrosion resistance ability of designed and modified alloys compared to those of the reference alloy were obtained by considering their Bot and Mdt values; this might lead to the development of alternative near α-Ti alloys to conventional materials.

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“…23,24) The d-electrons concept is easy and convenient to use in practical applications, compared with other alloy design methods such as the phase-field method and the thermodynamic modeling of ordered phases. 19,25,26) The compositional average values of Bo and Md of Ti alloys are represented by Bo t and Md t , respectively. 17) Ti alloys are classified into the ¡, ¡ + ¢, and ¢ types according to the phases existing in alloys.…”

Section: Introductionmentioning

confidence: 99%

Possibility of As-Cast Applications on β-Type Titanium Alloys Proposed in the Newly Expanded Area of Bot-Mdt Diagram

Matsugi

et al. 2020

Mater. Trans.

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Ten types ¢-type titanium alloys for as-cast applications were proposed by using mainly ubiquitous elements in the area greatly differ from conventional alloys in compositions, in the diagram consisting of bond order (Bo) and d-orbital energy level (Md). The object was to develop ¢type titanium alloys with ultimate tensile strength value of 1000 MPa and fracture strain value of 10% in as-cast condition without the posttreatments after cold crucible levitation melting, and their microstructures were controlled by adjusting its process parameters. The same microstructure and mechanical properties were also indicated on both as-cast and solution treated alloys, which mean the unnecessary of solution treatment in proposed alloys. Ti5.2Cr5.5Mn2.2Fe5.5Zr, Ti11Cr6Mn4.5Zr0.5Al and Ti13Zr6Mn6Cr5V alloys with a ¢ mono phase achieved objective values of mechanical properties in as-cast condition, which lead to development of alternative materials to the conventional ¢type titanium alloys, since they reduce energy consumption and 25% production costs by omitting complex post processing procedures. Moreover, the phase boundary between the mono ¢ phase and dual ¢ plus intermetallic compound phases were predicted for the first time in ¢type titanium alloys, according to the ten proposed alloys in newly expanded compositional area of the Bo t -Md t diagram.

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Property-Control of TiNi System Intermetallics and Their Characteristics

Cited by 5 publications

References 40 publications

Compositional Optimization of β Type Titanium Alloys with Shape Memory Ability and Their Characteristics

Compositional Optimization of β Type Titanium Alloys with Shape Memory Ability and Their Characteristics

Design of Near α-Ti Alloys with Optimized Mechanical and Corrosion Properties and Their Characterizations

Possibility of As-Cast Applications on β-Type Titanium Alloys Proposed in the Newly Expanded Area of <i>Bo<sub>t</sub>-Md<sub>t</sub></i> Diagram

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Property-Control of TiNi System Intermetallics and Their Characteristics

Cited by 5 publications

References 40 publications

Compositional Optimization of &beta; Type Titanium Alloys with Shape Memory Ability and Their Characteristics

Compositional Optimization of &beta; Type Titanium Alloys with Shape Memory Ability and Their Characteristics

Design of Near α-Ti Alloys with Optimized Mechanical and Corrosion Properties and Their Characterizations

Possibility of As-Cast Applications on β-Type Titanium Alloys Proposed in the Newly Expanded Area of <i>Bo<sub>t</sub>-Md<sub>t</sub></i> Diagram

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Compositional Optimization of β Type Titanium Alloys with Shape Memory Ability and Their Characteristics

Compositional Optimization of β Type Titanium Alloys with Shape Memory Ability and Their Characteristics