Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

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In Situ Observation of the Zr Poisoning Effect in Al Alloys Inoculated by Al-Ti-B
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 49 - Trang 4771-4784 - 2018
Yiwang Jia, Shubin Wang, Haijun Huang, Donghong Wang, Yanan Fu, Guoliang Zhu, Anping Dong, Dafan Du, Da Shu, Baode Sun
In situ synchrotron X-ray radiography observations of the Zr-poisoning phenomenon of an Al-20 wt pct Zn alloy inoculated by Al-5Ti-1B were carried out. The effects of Zr addition on heterogeneous nucleation, grain growth, and final grain size were quantitatively studied and further analyzed using the interdependence model. The experimental results show that the undercooling needed for nucleation i...... hiện toàn bộ
Considering particle morphology in a constitutive model for metal powders compaction
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - - 1999
T. Calvin Tszeng
Determination of thermophysical properties and boundary conditions of direct chill-cast aluminum alloys using inverse methods
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 31 - Trang 1627-1634 - 2000
J. -M. Drezet, M. Rappaz, G. -U. Grün, M. Gremaud
In order to quantify the cooling conditions undergone by an ingot during direct-chill (DC) casting, thermocouples were immersed in the liquid pool and consequently entrapped in the solid, thus monitoring the temperature of the metal during its descent. Assuming steady-state thermal conditions, the time-dependent temperatures measured by these thermocouples were then converted into spacedependent t...... hiện toàn bộ
Creep deformation characteristics of tin and tin-based electronic solder alloys
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 36 - Trang 99-105 - 2005
M. D. Mathew, H. Yang, S. Movva, K. L. Murty
Creep deformation characteristics of pure tin, and Sn-3.5Ag and Sn-5Sb electronic solder alloys, have been studied at various temperatures between ambient and 473 K (homologous temperature 0.58 to 0.85). Power-law relationships between strain rate and stress were observed at most of the temperatures. The stress exponent (n=7.6, 5.0, and 5.0) and activation energy (Q ...... hiện toàn bộ
Effect of Stress Level on the High Temperature Deformation and Fracture Mechanisms of Ti-45Al-2Nb-2Mn-0.8 vol. pct TiB2: An In Situ Experimental Study
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 44 - Trang 1887-1896 - 2012
Rocío Muñoz-Moreno, M. Teresa Pérez-Prado, Javier Llorca, Elisa María Ruiz-Navas, Carl J. Boehlert
The effect of the applied stress on the deformation and crack nucleation and propagation mechanisms of a γ-TiAl intermetallic alloy (Ti-45Al-2Nb-2Mn (at. pct)-0.8 vol. pct TiB2) was examined by means of in situ tensile (constant strain rate) and tensile-creep (constant load) experiments performed at 973 K (700 °C) using a scanning electron microscope. Colony boundary cracking developed during the ...... hiện toàn bộ
Đặc trưng Hành Vi Lão Hóa Trong Thép Maraging Cấp M250 Sử Dụng Đo Đạc Siêu Âm Dịch bởi AI
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 38 Số 2 - Trang 236-243 - 2007
Rajkumar, K.V., Kumar, Anish, Jayakumar, T., Raj, Baldev, Ray, K.K.
Các phép đo siêu âm đã được thực hiện trên các mẫu thép maraging cấp M250 trải qua quá trình ủ dung dịch ở nhiệt độ 1093 K trong 1 giờ, sau đó là lão hóa ở 755 K trong khoảng thời gian từ 0.25 đến 100 giờ. Ảnh hưởng của quá trình lão hóa đến cấu trúc vi mô, độ cứng ở nhiệt độ phòng và các tham số siêu âm (tốc độ sóng dọc và sóng cắt, và tỷ số Poisson) đã được nghiên cứu nhằm phát triển các mối tươ...... hiện toàn bộ
#Thép maraging #lão hóa #đo đạc siêu âm #tỷ số Poisson #tốc độ sóng dọc #tốc độ sóng cắt
Grain growth of nanocrystalline cryomilled Fe-Al powders
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 29 - Trang 2469-2475 - 1998
R. J. Perez, H. G. Jiang, E. J. Lavernia, C. P. Dogan
Nanocrystalline Fe-xAl (x=0, 2.6, or 10 wt pct) powders have been prepared using cryogenic mechanical alloying (cryomilling). The extremely low rate of diffusion of Al in Fe at the process temperature (−196 °C) effectively limits dissolution of Al in the nanocrystalline αFe grains. Thermal stability against grain growth in the cryomilled Fe-Al mixtures is found to be much greater than that of iden...... hiện toàn bộ
Experimental Verification of a Critical Condition for the Formation of As-Cast Coarse Columnar Austenite Grain Structure in a Hyperperitectic Carbon Steel
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 46 - Trang 5240-5247 - 2015
Munekazu Ohno, Masato Maruyama, Kiyotaka Matsuura
Experimental verification of a critical condition for the formation of coarse columnar γ grain (CCG) structure in as-cast hyperperitectic carbon steels, which was put forward based on theories of grain growth and phase-field simulations in early studies, is carried out by means of a Bridgman-type directional solidification experiment. The occurrence of the discontinuous and continuous grain growth...... hiện toàn bộ
Incremental Feeding High-Pressure Sliding for Grain Refinement of Large-Scale Sheets: Application to Inconel 718
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 49 - Trang 1830-1840 - 2018
Yoichi Takizawa, Kosei Sumikawa, Kyohei Watanabe, Takahiro Masuda, Manabu Yumoto, Yuta Kanai, Yoshiharu Otagiri, Zenji Horita
This study updates a process of high-pressure sliding (HPS) recently developed as a severe plastic deformation process under high pressure for grain refinement of sheet samples. The updated version, which we call the incremental feeding HPS (IF-HPS), consists of sliding for SPD and feeding for upsizing the SPD-processed area so that, without increasing the capacity of processing facility, it is po...... hiện toàn bộ
The Role of Ni-P Coating Structure on Fly Ash Cenospheres in the Formation of Magnesium Matrix Composites
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 48 - Trang 5649-5657 - 2017
Katarzyna N. Braszczyńska-Malik, Jacek Kamieniak
The role of the Ni-P coating structure on fly ash cenospheres in the fabrication of magnesium matrix composites has been investigated. Two composites based on AZ91 commercial magnesium alloys with hollow aluminosilicate cenospheres were fabricated by the negative pressure infiltration technique. Two kinds of cenospheres (i.e., as Ni-P coated and after heat treatment) were used in order to determin...... hiện toàn bộ
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