[ { "id": "authors:w91q1-08270", "collection": "authors", "collection_id": "w91q1-08270", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131112-074551312", "type": "article", "title": "Fatigue and corrosion of a Pd-based bulk metallic glass in\n various environments", "author": [ { "family_name": "Watanabe", "given_name": "L. Y.", "clpid": "Watanabe-L-Y" }, { "family_name": "Roberts", "given_name": "S. N.", "clpid": "Roberts-S-N" }, { "family_name": "Baca", "given_name": "N.", "clpid": "Baca-N" }, { "family_name": "Wiest", "given_name": "A.", "clpid": "Wiest-A" }, { "family_name": "Garrett", "given_name": "S. J.", "clpid": "Garrett-S-J" }, { "family_name": "Conner", "given_name": "R. D.", "clpid": "Conner-R-D" } ], "abstract": "Bulk metallic glasses (BMGs) possess attractive properties for biomedical applications, including high strength, hardness and corrosion resistance, and low elastic modulus. In this study, we conduct rotating beam fatigue tests on Pd_(43)Ni_(10)Cu_(27)P_(20) bulk metallic glass in air and Eagle's medium (EM) and measure the corrosive resistance of the alloy by submersion in acidic and basic electrolytes. Fatigue results are compared to those of commonly used biometals in EM. Rotating beam fatigue tests conducted in air and in Eagle's medium show no deterioration in fatigue properties in this potentially corrosive environment out to 10^7 cycles. A specimen size effect is revealed when comparing fatigue results to those of a similar alloy of larger minimum dimensions. Corrosion tests show that the alloy is not affected by highly basic (NaOH) or saline (NaCl) solutions, nor in EM, and is affected by chlorinated acidic solutions (HCl) to a lesser extent than other commonly used biometals. Corrosion in HCl initiates with selective leaching of late transition metals, followed by dissolution of Pd.", "doi": "10.1016/j.msec.2013.05.044", "issn": "0928-4931", "publisher": "Elsevier", "publication": "Materials Science and Engineering C", "publication_date": "2013-10-01", "series_number": "7", "volume": "33", "issue": "7", "pages": "4021-4025" }, { "id": "authors:zem8t-hjm65", "collection": "authors", "collection_id": "zem8t-hjm65", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100628-074939842", "type": "article", "title": "Deformation and crystallization of Zr-based amorphous alloys in homogeneous flow regime", "author": [ { "family_name": "Tao", "given_name": "Min", "clpid": "Tao-Min" }, { "family_name": "Chokshi", "given_name": "Atul H.", "clpid": "Chokshi-A-H" }, { "family_name": "Conner", "given_name": "Robert D.", "clpid": "Conner-R-D" }, { "family_name": "Ravichandran", "given_name": "Guruswami", "orcid": "0000-0002-2912-0001", "clpid": "Ravichandran-G" }, { "family_name": "Johnson", "given_name": "William L.", "clpid": "Johnson-W-L" } ], "abstract": "The purpose of this study is to experimentally investigate the interaction of inelastic deformation and microstructural changes of two Zr-based bulk metallic glasses (BMGs): Zr_(41.25)Ti_(13.75)Cu_(12.5)Ni_(10)Be_(22.5) (commercially designated as Vitreloy 1 or Vit1) and Zr_(46.75)Ti_(8.25)Cu_(7.5)Ni_(10)Be_(27.5) (Vitreloy 4, Vit4). High-temperature uniaxial compression tests were performed on the two Zr alloys at various strain rates, followed by structural characterization using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two distinct modes of mechanically induced atomic disordering in the two alloys were observed, with Vit1 featuring clear phase separation and crystallization after deformation as observed with TEM, while Vit4 showing only structural relaxation with no crystallization. The influence of the structural changes on the mechanical behaviors of the two materials was further investigated by jump-in-strain-rate tests, and flow softening was observed in Vit4. A free volume theory was applied to explain the deformation behaviors, and the activation volumes were calculated for both alloys.", "doi": "10.1557/JMR.2010.0134", "issn": "0884-2914", "publisher": "Materials Research Society", "publication": "Journal of Materials Research", "publication_date": "2010-06", "series_number": "6", "volume": "25", "issue": "6", "pages": "1137-1148" }, { "id": "authors:1t777-ty265", "collection": "authors", "collection_id": "1t777-ty265", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100526-111224370", "type": "article", "title": "Correlation between fracture surface morphology and toughness in Zr-based bulk metallic glasses", "author": [ { "family_name": "Suh", "given_name": "Jin-Yoo", "clpid": "Suh-Jin-Yoo" }, { "family_name": "Conner", "given_name": "R. Dale", "clpid": "Conner-R-D" }, { "family_name": "Kim", "given_name": "C. Paul", "clpid": "Kim-C-P" }, { "family_name": "Demetriou", "given_name": "Marios D.", "clpid": "Demetriou-M-D" }, { "family_name": "Johnson", "given_name": "William L.", "clpid": "Johnson-W-L" } ], "abstract": "Fracture surfaces of Zr-based bulk metallic glasses of various compositions tested in the as-cast and annealed conditions were analyzed using scanning electron microscopy. The tougher samples have shown highly jagged patterns at the beginning stage of crack propagation, and the length and roughness of this jagged pattern correlate well with the measured fracture toughness values. These jagged patterns, the main source of energy dissipation in the sample, are attributed to the formation of shear bands inside the sample. This observation provides strong evidence of significant \"plastic zone\" screening at the crack tip.", "doi": "10.1557/JMR.2010.0112", "issn": "0884-2914", "publisher": "Materials Research Society", "publication": "Journal of Materials Research", "publication_date": "2010-05", "series_number": "5", "volume": "25", "issue": "5", "pages": "982-990" }, { "id": "authors:s2dfr-qhj06", "collection": "authors", "collection_id": "s2dfr-qhj06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090918-114020129", "type": "article", "title": "Injection molding metallic glass", "author": [ { "family_name": "Wiest", "given_name": "Aaron", "clpid": "Wiest-A" }, { "family_name": "Harmon", "given_name": "John S.", "clpid": "Harmon-J-S" }, { "family_name": "Demetriou", "given_name": "Marios D.", "clpid": "Demetriou-M-D" }, { "family_name": "Conner", "given_name": "R. Dale", "clpid": "Conner-R-D" }, { "family_name": "Johnson", "given_name": "William L.", "clpid": "Johnson-W-L" } ], "abstract": "Advances in alloy development have produced the Zr_(35)Ti_(30)Be_(27.5)Cu_(7.5) alloy with a crystallization\u2013glass transition temperature, \u0394T, of 165 \u00b0C. This alloy's large supercooled liquid region provides the longest processing times and lowest processing viscosities of any metallic glass and was injection molded using tooling based on plastic injection molding technology. Injection-molded beams and die-cast beams were tested in three-point bending. The average modulus of rupture (MOR) was found to be similar, while injection-molded beams had a smaller standard deviation in MOR.", "doi": "10.1016/j.scriptamat.2008.09.021", "issn": "1359-6462", "publisher": "Elsevier", "publication": "Scripta Materialia", "publication_date": "2009-02", "series_number": "3", "volume": "60", "issue": "3", "pages": "160-163" }, { "id": "authors:nyqap-vcp68", "collection": "authors", "collection_id": "nyqap-vcp68", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090914-091033623", "type": "article", "title": "Fracture toughness study of new Zr-based Be-bearing bulk metallic glasses", "author": [ { "family_name": "Kim", "given_name": "C. Paul", "clpid": "Kim-C-P" }, { "family_name": "Suh", "given_name": "Jin-Yoo", "clpid": "Suh-Jin-Yoo" }, { "family_name": "Wiest", "given_name": "Aaron", "clpid": "Wiest-A" }, { "family_name": "Lind", "given_name": "Mary Laura", "clpid": "Lind-M-L" }, { "family_name": "Conner", "given_name": "R. Dale", "clpid": "Conner-R-D" }, { "family_name": "Johnson", "given_name": "William L.", "clpid": "Johnson-W-L" } ], "abstract": "Three new compositional variants of the Zr\u2013Ti\u2013Be\u2013LTM (late transition metal) family of metallic glasses are discussed. Thermal stability, \u0394T = T_x\u2212T_g, was increased from 82 \u00b0C for Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) (Viterloy 1) to 141 \u00b0C for Zr_(44)Ti_(11)Cu_(20)Be_(25). It is found that fracture toughness is the most distinguishing parameter characterizing the alloys in contrast to other mechanical properties. Quaternary alloys consistently had fracture toughness values exceeding 80 MPa m^(1/2), while for Vitreloy 1 K_Q = 48.5 MPa m^(1/2) with a large amount of scatter. Adding iron reduced the fracture toughness to 25 MPa m^(1/2).", "doi": "10.1016/j.scriptamat.2008.09.001", "issn": "1359-6462", "publisher": "Elsevier", "publication": "Scripta Materialia", "publication_date": "2009-01", "series_number": "2", "volume": "60", "issue": "2", "pages": "80-83" }, { "id": "authors:3hk5q-5yx77", "collection": "authors", "collection_id": "3hk5q-5yx77", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:SUHsm08", "type": "article", "title": "Novel thermoplastic bonding using a bulk metallic glass solder", "author": [ { "family_name": "Suh", "given_name": "Jin-Yoo", "clpid": "Suh-Jin-Yoo" }, { "family_name": "Lohwongwatana", "given_name": "Boonrat", "clpid": "Lohwongwatana-B" }, { "family_name": "Garland", "given_name": "Carol M.", "clpid": "Garland-C-M" }, { "family_name": "Conner", "given_name": "R. Dale", "clpid": "Conner-R-D" }, { "family_name": "Johnson", "given_name": "William L.", "clpid": "Johnson-W-L" }, { "family_name": "Suh", "given_name": "Daewoong", "clpid": "Suh-Daewoong" } ], "abstract": "A novel thermoplastic bonding concept is demonstrated based on the unique rheological behavior and pattern-replicating ability of bulk metallic glass (BMG)-forming liquids. In this approach, the BMG is heated above Tg to the \"supercooled liquid\" region while a small normal force is applied to the joint. This results in liquid reflow, wetting and a strong bond. Complete wetting between copper substrates and a layer of platinum-based BMG leads to an atomistically intimate void-free interface.", "doi": "10.1016/j.scriptamat.2008.06.055", "issn": "1359-6462", "publisher": "Elsevier", "publication": "Scripta Materialia", "publication_date": "2008-10", "series_number": "8", "volume": "59", "issue": "8", "pages": "905-908" }, { "id": "authors:0yp0n-f4s64", "collection": "authors", "collection_id": "0yp0n-f4s64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:CONjap03", "type": "article", "title": "Shear bands and cracking of metallic glass plates in bending", "author": [ { "family_name": "Conner", "given_name": "R. D.", "clpid": "Conner-R-D" }, { "family_name": "Johnson", "given_name": "W. L.", "clpid": "Johnson-W-L" }, { "family_name": "Paton", "given_name": "N. E.", "clpid": "Paton-N-E" }, { "family_name": "Nix", "given_name": "W. D.", "clpid": "Nix-W-D" } ], "abstract": "The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the shear band processes responsible for these properties. We argue that the shear band spacing (and length) scales with the thickness of the plate because of strain relaxation in the vicinity of the shear band at the surface. This is consistent with recent measurements of shear band spacing versus sample size. We also argue that the shear displacements in the shear band scale with the shear band length and plate thickness, thus causing cracks to be initiated in thicker plates at smaller bending strains. This leads to fracture bending strains that decrease markedly with increasing plate thickness, consistent with recent experiments. These results suggest that amorphous metals in the form of foams might have superior ductility and toughness.", "doi": "10.1063/1.1582555", "issn": "0021-8979", "publisher": "Journal of Applied Physics", "publication": "Journal of Applied Physics", "publication_date": "2003-07-15", "series_number": "2", "volume": "94", "issue": "2", "pages": "904-911" }, { "id": "authors:nb9ch-rf950", "collection": "authors", "collection_id": "nb9ch-rf950", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120111-074245517", "type": "article", "title": "Mechanical properties of Zr_(57)Nb_5Al_(10)Cu_(15.4)Ni_(12.6) metallic glass matrix particulate composites", "author": [ { "family_name": "Conner", "given_name": "R. D.", "clpid": "Conner-R-D" }, { "family_name": "Choi-Yim", "given_name": "H.", "clpid": "Choi-Yim-H" }, { "family_name": "Johnson", "given_name": "W. L.", "clpid": "Johnson-W-L" } ], "abstract": "To increase the toughness of a metallic glass with the nominal composition Zr_(57)Nb_5Al_(10)Cu_(15.4)Ni_(12.6), it was used as the matrix in particulate composites reinforced with W, WC, Ta, and SiC. The composites were tested in compression and tension experiments. Compressive strain to failure increased by more than 300% compared with the unreinforced Zr_(57)Nb_5Al_(10)Cu_(15.4)Ni_(12.6), and energy to break of the tensile samples increased by more than 50%. The increase in toughness came from the particles restricting shear band propagation, promoting the generation of multiple shear bands and additional fracture surface area. There was direct evidence of viscous flow of the metallic glass matrix within the confines of the shear bands.", "doi": "10.1557/JMR.1999.0445", "issn": "0884-2914", "publisher": "Materials Research Society", "publication": "Journal of Materials Research", "publication_date": "1999-08", "series_number": "8", "volume": "14", "issue": "8", "pages": "3292-3297" }, { "id": "authors:jqas4-tpd26", "collection": "authors", "collection_id": "jqas4-tpd26", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:DANjmr98", "type": "article", "title": "Melt infiltration casting of bulk metallic-glass matrix composites", "author": [ { "family_name": "Dandliker", "given_name": "R. B.", "clpid": "Dandliker-R-B" }, { "family_name": "Conner", "given_name": "R. D.", "clpid": "Conner-R-D" }, { "family_name": "Johnson", "given_name": "W. L.", "clpid": "Johnson-W-L" } ], "abstract": "The authors describe a technique for melt infiltration casting of composites with a metallic-glass matrix. We made rods 5 cm in length and 7 mm in diameter. The samples were reinforced by continuous metal wires, tungsten powder, or silicon carbide particulate preforms. The most easily processed composites were those reinforced with tungsten and carbon steel continuous wire reinforcement. The Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 matrix was quenched to a glass after infiltrating the reinforcement. We analyzed the microstructure of the composites by x-ray diffraction and scanning electron microscopy. The measured porosity was less than 3% and the matrix was about 97% amorphous material.", "doi": "10.1557/JMR.1998.0396", "issn": "0884-2914", "publisher": "Materials Research Society", "publication": "Journal of Materials Research", "publication_date": "1998-10", "series_number": "10", "volume": "13", "issue": "10", "pages": "2896-2901" } ]