Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 30    No. 2    February 2020

[PDF Download]        

    

Effects of laser surface melting on crystallographic texture, microstructure, elastic modulus and hardness of Ti-30Nb-4Sn alloy
Leonardo FANTON1, Nelson Batista de LIMA2, Emilio Rayón ENCINAS3, Vicente Amigó BORRáS3, Conrado Ramos Moreira AFONSO4, Jo?o Batista FOGAGNOLO1

1. School of Mechanical Engineering, University of Campinas, Rua Mendeleyev, 200, CEP 13083-860, Campinas, SP, Brazil;
2. Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242, CEP 05508-000, S?o Paulo, SP, Brazil;
3. Institut de Tecnologia de Materials, Universitat Politècnica de València, Camino de Vera, s/n, Código Postal 46022, Valencia, Spain;
4. Department of Materials Engineering, Federal University of S?o Carlos, Rodovia Washington Luís, Km 235, CEP 13565-905, S?o Carlos, SP, Brazil

Abstract:The biocompatibility of orthopedic implants is closely related to their elastic modulus and surface properties. The objective of this study was to determine the effects of cold rolling, recrystallization and laser surface melting (LSM) on the microstructure and mechanical properties of a biphase (α″+β) Ti-30Nb-4Sn alloy. X-ray diffraction (XRD) texture analysis of the cold-rolled substrate revealed the [302]α//ND texture component, while analysis of the recrystallized substrate showed the [302]α//ND and [110]α//ND components. The β-phase texture could not be directly measured by XRD, but the presence of the [111]β//ND texture component was successfully predicted by considering the orientation relationship between the α″ and β phases. Nanoindentation measurements showed that the elastic modulus of the cold-rolled substrate (63 GPa) was lower than that of the recrystallized substrate (74 GPa). Based on the available literature and the results presented here, it is suggested that this difference is caused by the introduction of crystal defects during cold deformation. The combined nanoindentation/EBSD analysis showed that the nanoindentation results are not affected by crystal orientation. LSM of the deformed alloy produced changes in hardness, elastic modulus and crystallographic texture similar to those produced by recrystallization heat treatment, creating a stiffness gradient between surface and substrate.

 

Key words: titanium alloy; cold rolling; laser surface melting; recrystallization; crystallographic texture; stiffness- graded material

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com