Zobrazeno 1 - 10
of 51
pro vyhledávání: '"William D. Griffiths"'
Enhancement of Mechanical Properties of Pure Aluminium through Contactless Melt Sonicating Treatment
Autor:
Agnieszka Dybalska, Adrian Caden, William D. Griffiths, Zakareya Nashwan, Valdis Bojarevics, Georgi Djambazov, Catherine E. H. Tonry, Koulis A. Pericleous
Publikováno v:
Materials, Vol 14, Iss 16, p 4479 (2021)
A new contactless ultrasonic sonotrode method was previously designed to provide cavitation conditions inside liquid metal. The oscillation of entrapped gas bubbles followed by their final collapse causes extreme pressure changes leading to de-agglom
Externí odkaz:
https://doaj.org/article/5c4ba7e5f6ad4650b789030c826d4ec2
Autor:
Koulis Pericleous, Valdis Bojarevics, Georgi Djambazov, Agnieszka Dybalska, William D. Griffiths, Catherine Tonry
Publikováno v:
Materials, Vol 12, Iss 21, p 3610 (2019)
A high frequency tuned electromagnetic induction coil is used to induce ultrasonic pressure waves leading to cavitation in alloy melts. This presents an alternative ‘contactless’ approach to conventional immersed probe techniques. The method can
Externí odkaz:
https://doaj.org/article/784a625841034d48ad619cb44e6643d1
Autor:
William D. Griffiths, Qi Chen
Publikováno v:
Metallurgical and Materials Transactions B. 52:502-516
In this work, Mo was added into Al melt to reduce the detrimental effect of double-oxide film defect. An air bubble was trapped in a liquid metal (2L99), served as an analogy for double-oxide film defect in aluminum alloy castings. It was found that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdd207cf0f99901713a61f7ea2e6d88d
https://doi.org/10.1007/s11663-020-02038-w
https://doi.org/10.1007/s11663-020-02038-w
Publikováno v:
Metallurgical and Materials Transactions B. 51:1912-1917
To improve the properties of castings, a new technique to observe the fluid flow and study the motion of oxygen-bearing inclusions has been developed. This new technique, Positron Emission Particle Tracking (PEPT), enabled a single radioactive tracer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ca7a27d38a98dde5e48151b28c61ee6
https://doi.org/10.1007/s11663-020-01897-7
https://doi.org/10.1007/s11663-020-01897-7
Enhancement of Mechanical Properties of Pure Aluminium through Contactless Melt Sonicating Treatment
Autor:
C. Tonry, Zakareya Nashwan, Agnieszka Dybalska, William D. Griffiths, A.J. Caden, Valdis Bojarevics, Georgi Djambazov, Koulis Pericleous
Publikováno v:
Materials
Volume 14
Issue 16
Materials, Vol 14, Iss 4479, p 4479 (2021)
Volume 14
Issue 16
Materials, Vol 14, Iss 4479, p 4479 (2021)
A new contactless ultrasonic sonotrode method was previously designed to provide cavitation conditions inside liquid metal. The oscillation of entrapped gas bubbles followed by their final collapse causes extreme pressure changes leading to de-agglom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e96085ed3dfd356c6f8bb50d8b2d0072
https://pubmed.ncbi.nlm.nih.gov/34443002
https://pubmed.ncbi.nlm.nih.gov/34443002
Autor:
Qi Chen, William D. Griffiths
Publikováno v:
International Journal of Cast Metals Research. 32:221-228
A mould was designed to produce considerable splashing during filling, resulting in the entrainment of freshly produced double oxide film defects. Two moulds were cast to produce 60 testbars in tot...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64c9f00067d5cea762be8e67a3363ddb
https://doi.org/10.1080/13640461.2019.1635348
https://doi.org/10.1080/13640461.2019.1635348
Autor:
Georgi Djambazov, C. Tonry, Christopher Beckwith, Valdis Bojarevics, Koulis Pericleous, Agnieszka Dybalska, William D. Griffiths
Contactless ultrasound is a novel, easily implemented, technique for the Ultrasonic Treatment (UST) of liquid metals. Instead of using a vibrating sonotrode probe inside the melt, which leads to contamination, we consider a high AC frequency electrom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::81803d88cc9fc9e051199ba3b771580d
Autor:
Qi Chen, William D. Griffiths
Publikováno v:
Metallurgical and Materials Transactions A. 48:5688-5698
In this paper, Sr modifier (300 ppm) was added to 2L99 alloy sand castings to investigate its effect on bifilm defects in the castings. Two different sand molds were used in this study, with good and bad running system designs, to introduce different
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f658e63cf035978d92ab40ed504702f9
https://doi.org/10.1007/s11661-017-4310-8
https://doi.org/10.1007/s11661-017-4310-8
Publikováno v:
Metallurgical and Materials Transactions A. 48:5516-5528
The Maximum Likelihood method and the Linear Least Squares (LLS) method have been widely used to estimate Weibull parameters for reliability of brittle and metal materials. In the last 30 years, many researchers focused on the bias of Weibull modulus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c44297c9d6408c6dc137d664c2fd2bd0
https://doi.org/10.1007/s11661-017-4294-4
https://doi.org/10.1007/s11661-017-4294-4
Publikováno v:
Materials Science and Technology. 33:2212-2222
Double oxide film defects have been associated with reduced mechanical properties and increased variability in properties in cast Al alloys. This paper explores the effects of the addition of around 0.4–0.5 wt-% of the transition metals Mo or W to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00a050d003b0a0c265cd24c313e0bc4f
https://doi.org/10.1080/02670836.2017.1346911
https://doi.org/10.1080/02670836.2017.1346911