Microstructural development of brass alloys with various Bi and Pb additions

Hsieh, Chih-Chun; Wang, Jia-Siang; Wu, Paxon Ti-Yuan; Wu, Weite

doi:10.1007/s12540-013-6002-2

Cited by 19 publications

(19 citation statements)

References 13 publications

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“…6(b). In addition, Chih-Chun et al and Martinez-Hernandez et al 27,28) showed that bismuth additions to CuZnAl alloys precipitated as bismuth particles at the phase boundaries, as shown in Fig. 6(c), which resulted in cracks on the surface of castings and promoted embrittlement during machining.…”

Section: Microstructures and Chemical Analysismentioning

confidence: 97%

“…25) Jang et al 26) found that bismuth could form globules of a bismuth intermetallic compound with Ce, La, Nd and other rare earth elements and were present at the phase boundaries. In addition, Chih-Chun et al and Martinez-Hernandez et al 27,28) suggested that bismuth in CuZnAl alloys precipitated as bismuth particles at the phase boundaries, which resulted in cracks on the surface of castings and promoted embrittlement during machining process.…”

Section: Introductionmentioning

confidence: 99%

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Bismuth Formation in Lead-Free Cu–Zn–Si Yellow Brass with Various Bismuth–Tin Alloy Additions

Suksongkarm

Rojananan

2018

Mater. Trans.

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Typically, bismuth added in traditional CuZn brass segregates as films or particles along the alpha-beta phase boundary and induces cracks after casting. The present work investigated the bismuth formation in lead-free CuZnSi yellow brass with various amounts of recycled bismuthtin (BiSn) solder. The results showed that no bismuth film segregated at the phase boundaries. In contrast, round particles of bismuth formed in the beta phase and at the alpha-beta phase boundaries when added 1 mass% BiSn alloy and the bismuth particles embedded only in the alpha phase when added 2 to 4 mass% BiSn alloy, respectively. The morphology of the fracture surfaces was significantly modified when BiSn alloy content was increased. More importantly, there was no crack observed in as-cast samples and samples did not subject to any heat treatment process unlike the bismuth formation in other work. Thus, this work suggests that the addition of recycled BiSn solder in lead-free CuZnSi yellow brass is beneficial to avoid cracks in castings and offer an original lead-free brass alloy with superior properties.

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Section: Microstructures and Chemical Analysismentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Bismuth Formation in Lead-Free Cu–Zn–Si Yellow Brass with Various Bismuth–Tin Alloy Additions

Suksongkarm

Rojananan

2018

Mater. Trans.

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“…Although there are other etchants to reveal the brass microstructure (i.e. FeCl 3 into HCl solution 5,10,22 , and a HNO 3 solution 23 ), the ammonium persulfate has produced satisfactory micrographs.…”

Section: Microstructural Observation and Hardnessmentioning

confidence: 99%

“…Zinc content effect 12 and gas pressure in mold during casting, which also affect the quality of the casting produced have also been reported by Ott et al 12,13 . A number of other important contributions concerning to Cu alloys (in particular brasses) involving thermodynamic aspects and some properties has been reported [5][6][7][8][13][14][15][16][17][18]22,23 . Recently, it has been published a paper 18 discussing a new shell casting for investment casting for distinctive materials and applications.…”

Section: Introductionmentioning

confidence: 99%

Designing a Microstructural Array Associated with Hardness of Dual-phase Cu-Zn Alloy Using Investment Casting

et al. 2018

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A comparative investigation on the microstructural morphologies and hardness values of Cu-35 wt.% Zn and Cu-30 wt.% Zn with 1.5 wt.% Al content is provided. Distinctive specimens by using traditional investment casting were produced. Specimens withdrawn from distinct locations along the castings were thermally and microstructural analyzed. Thermally and chemically induced microstructural modifications affecting the microstructure and hardness are discussed. It is found that components (specimens) located at different positions along of the pattern tree casting have distinctive hardness values. This is associated with Cu segregation and cooling rate. It is also found that solidified piece under a cooling rate ~0.12 K/s has hardness 20% higher than the specimen solidified under 0.07 K/s. Duplex brass with Widmanstätten structure constitutes the resulting microstructure array. This seems to be associated with Al content, while both Zn and Al contents are associated with cooling rate as responsible parameter to induce Widmanstätten structure formation.

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“…In recent developments of machinable brasses, Bi and Si have been used as alternatives to lead in free-cutting-brass [1,8]. The addition of small amounts of Bi made the microstructure of Widmanstätten structures [12]. However, the effect of Si on the microstructure of brass is not well known.…”

Section: Introductionmentioning

confidence: 99%

Effects of Si on the microstructure, ordering transformation and properties of the Cu60Zn40 alloy

Doostmohammadi

Moridshahi

2015

Journal of Alloys and Compounds

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Microstructural development of brass alloys with various Bi and Pb additions

Cited by 19 publications

References 13 publications

Bismuth Formation in Lead-Free Cu–Zn–Si Yellow Brass with Various Bismuth–Tin Alloy Additions

Bismuth Formation in Lead-Free Cu–Zn–Si Yellow Brass with Various Bismuth–Tin Alloy Additions

Designing a Microstructural Array Associated with Hardness of Dual-phase Cu-Zn Alloy Using Investment Casting

Effects of Si on the microstructure, ordering transformation and properties of the Cu60Zn40 alloy

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