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

被引：31
作者：
Kalita, Damian [1 ]
Rogal, Lukasz [1 ]
Czeppe, Tomasz [1 ]
Wojcik, Anna [1 ]
Kolano-Burian, Aleksandra [2 ]
Zackiewicz, Przemyslaw [2 ]
Kania, Bogusz [1 ]
Dutkiewicz, Jan [1 ]
机构：
[1] Polish Acad Sci, Inst Met & Mat Sci, Reymonta 25 St, PL-30059 Krakow, Poland
[2] Inst Nonferrous Met, Sowinskiego 5 St, PL-44100 Gliwice, Poland
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2020年 / 29卷 / 03期
关键词：
martensitic transformation; mechanical alloying; sintered alloy; superelasticity; titanium alloys; SHAPE-MEMORY BEHAVIOR; MARTENSITIC-TRANSFORMATION; DEFORMATION-BEHAVIOR; TITANIUM-ALLOYS; HEAT-TREATMENT; BETA; SUPERELASTICITY; ZR; OMEGA; STABILITY;
D O I：
10.1007/s11665-019-04417-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 alpha-phase at grain boundaries of beta-grains were observed. In order to improve the homogeneity of the materials, additional heat treatment at 1250 degrees C for 24 h was performed. As a result, Nb particles were dissolved in the matrix and the amount of alpha-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 alpha-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 A(s) and A(f) temperatures were - 12.4 and 2.2 degrees C, respectively.
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收藏
页码：1445 / 1452
页数：8
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