The properties and performance of lead-free solder alloys such as fluidity and wettability are defined by the alloy composition and solidification microstructure. Rapid solidification of metallic alloys is known to result in refined microstructures with reduced microsegregation and improved mechanical properties of the final products as compared to normal castings. The rapidly solidified Sn-based solders by melt spinning were shown to be suitable for soldering with low temperature and short soldering duration. In the present study, rapidly solidified Sn-0.7 wt.%Cu droplets generated by impulse atomization (IA) were achieved as well as directional solidification under transient conditions at lower cooling rate. This paper reports on a comparative study of the rapidly solidified and the directionally solidified samples. Different but complementary characterization techniques were used to fully analyze the solidification microstructures of the samples obtained under the two cooling regimes. These include X-ray diffractometry (XRD) and scanning electron microscopy (SEM). In order to compare the tensile strength and elongation to fracture of the directionally solidified ingot and strip castings with the atomized droplet, compaction and extrusion of the latter were carried out. It was shown that more balanced and superior tensile mechanical properties are available for the hot extruded samples from compacted as-atomized Sn-0.7 wt.%Cu droplets. Further, elongation-to-fracture was 2-3x higher than that obtained for the directionally solidified samples. (C) 2014 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. All rights reserved.
机构:
Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sclo Paulo, BrazilUniv Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, Brazil
Spinelli, Jose E.
;
Garcia, Amauri
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Univ Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, BrazilUniv Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, Brazil
机构:
Fed Inst Educ Sci & Technol Rio Grande Norte IFRN, BR-59015000 Natal, RN, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Moura, Itamazeo T. L.
;
Silva, Celina L. M.
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Fed Inst Educ Sci & Technol Rio Grande Norte IFRN, BR-59015000 Natal, RN, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Silva, Celina L. M.
;
Cheung, Noe
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Fed Inst Educ Sci & Technol Sao Paulo IFSP, BR-13872550 Sao Joao Da Boa Vista, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Cheung, Noe
;
Goulart, Pedro R.
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Fed Inst Educ Sci & Technol Sao Paulo IFSP, BR-18202000 Itapetininga, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Goulart, Pedro R.
;
Garcia, Amauri
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Univ Campinas UNICAMP, Dept Mat Engn, BR-13083970 Campinas, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Garcia, Amauri
;
Spinelli, Jose E.
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h-index: 0
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Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
机构:
Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sclo Paulo, BrazilUniv Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, Brazil
Spinelli, Jose E.
;
Garcia, Amauri
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h-index: 0
机构:
Univ Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, BrazilUniv Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, Brazil
机构:
Fed Inst Educ Sci & Technol Rio Grande Norte IFRN, BR-59015000 Natal, RN, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Moura, Itamazeo T. L.
;
Silva, Celina L. M.
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h-index: 0
机构:
Fed Inst Educ Sci & Technol Rio Grande Norte IFRN, BR-59015000 Natal, RN, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Silva, Celina L. M.
;
Cheung, Noe
论文数: 0引用数: 0
h-index: 0
机构:
Fed Inst Educ Sci & Technol Sao Paulo IFSP, BR-13872550 Sao Joao Da Boa Vista, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Cheung, Noe
;
Goulart, Pedro R.
论文数: 0引用数: 0
h-index: 0
机构:
Fed Inst Educ Sci & Technol Sao Paulo IFSP, BR-18202000 Itapetininga, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Goulart, Pedro R.
;
Garcia, Amauri
论文数: 0引用数: 0
h-index: 0
机构:
Univ Campinas UNICAMP, Dept Mat Engn, BR-13083970 Campinas, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
Garcia, Amauri
;
Spinelli, Jose E.
论文数: 0引用数: 0
h-index: 0
机构:
Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, BrazilFed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil