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Abstract

Bulk metallic glass (BMG) has good mechanical strength, high hardness, wear resistance, and corrosion resistance with promising application in various industries. However, for the industrial production of BMG, the main issue is how to overcome limitations of joining with other materials. The present study focuses on solder processing at low operating temperature to avoid exceeding the recrystallization temperature. A feasible joining process for BMG was developed using lead-free solders. The BMG surface is pre-plated with copper, nickel, or titanium as a wetting layer. The reaction temperature is set between the glass transition temperature of BMG and the melting point of the solder. After a reflowing and aging process, the joint sample was examined using SEM, EDS, EPMA, and XRD. The Cu–Zr based BMG can be successfully joined with Sn-58Bi solder after plating Cu on the BMG surface. A diffusion layer was observed and the thickness increased with longer aging time. The main components of the diffusion layer are ZrO2 and Cu10Zr7.

Bahasa Abstract

Kajian Numerik Penjepit yang Ditahan Menekuk (BRB) pada Struktur-struktur Baja dan Perbandingan dengan Penjepit Biasa yang Konvergen (OCB) dengan Pembebanan Statis dan Dinamis. Filosofi rancangan gedung-gedung tahan gempa bumi telah mengalami banyak perubahan dalam tahun-tahun belakangan ini. Banyak sruktur yang dirancang dengan metode-metode tradisional, dan juga pengembangan metode-metode analisis serta kemajuan kinerja kompuer yang signifikan, merupakan faktor-faktor yang memberi kontribusi pada perubahan-perubahan tersebut. Di dalam kajian ini, ketahanan sruktur baja yang dijepit diinvestigasi dengan menggunakan penjepit yang ditahan menekuk (buckling restrained braces (BRB)) dan dibandingkan dengan suatu penjepit biasa yang konvergen (a convergent ordinary brace (OCB)). Gedung-gedung dengan 5, 8, 10, dan 12 lantai yang rancangannya buruk diperkokoh dengan BRB dan kinerjanya diinvestigasi dengan menggunakan analisis statis dan dinamis non linier. Di dalam kajian ini, penguatan bagian-bagian struktur lainnya pada penjepit tersebut diinvestigasi. Hasil-hasilnya menunjukkan bahwa pengurangan sambungan plastis pada perpindahan ruang antara BRB k arah rangka-rangka pada pnjepit konvnsional lbih kcil karena menurunnya prilaku plastis sambungan dan distribusi prpindahan rlatif pada ruang antara.

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