The Formation Mechanism of Equiaxed Crystals in Pure Aluminum Solidification Structure under the Al-Ti-C Master Alloy

2013 ◽  
Vol 668 ◽  
pp. 865-869
Author(s):  
Wan Wu Ding ◽  
Wen Jun Zhao ◽  
Tian Dong Xia
Keyword(s):  
Transition Zone ◽  
Formation Mechanism ◽  
Master Alloy ◽  
Heterogeneous Nucleation ◽  
Pure Aluminum ◽  
Solidification Structure ◽  
Impact Mechanism ◽  
Tic Particle ◽  
The Impact

The influence of different solidified velocities on the structure of pure aluminum during the process of refinement by Al-5Ti-0.6C master alloy was studied and the impact mechanism was discussed. The results show that at the same solidified velocity, with the increase of the amount of Al-5Ti-0.6C master alloy, in the solidified structure of pure aluminum, columnar crystals will gradually decrease, while equiaxed crystals will gradually increase. But in the case when the level of addition is the same, the faster the solidified velocity, the greater the number of equiaxed crystals will be in the ingot microstructure. The formation of equiaxed crystals is the result of the dual role of dissociation of crystal particles and heterogeneous nucleation of “TiC particle---Ti transition zone”.

The Behavior of AlTiC Master Alloys in Grain Refining of Commercial and High Pure Aluminum

2005 ◽  
Vol 475-479 ◽  
pp. 313-316
Author(s):  
Jian Guo Li ◽  
Min Huang ◽  
Zimu Shi ◽  
Dong Yu Liu
Keyword(s):  
Master Alloy ◽  
Heterogeneous Nucleation ◽  
Pure Aluminum ◽  
Grain Refining ◽  
Refining Efficiency ◽  
Master Alloys

The AlTiC master alloy has been prepared in different components to refine 99.8%Al and 99.98％Al, then compared to two typical Al5Ti1B in refining efficiency and the grain nuclear. The result showed that the refining efficiency seemed better if the nucleation of high pure aluminum revealed complexity and variety. It may due to that the latency heterogeneous nucleation was efficient on the whole, consequently accelerated refining efficiency.

scholarly journals Green technology innovation, media attention and enterprise performance

2021 ◽  
Vol 267 ◽  
pp. 01049
Author(s):  
Mingming Liu ◽  
Hongjie Zhang
Keyword(s):  
Empirical Analysis ◽  
Technology Innovation ◽  
Green Technology ◽  
Enterprise Performance ◽  
Promoting Effect ◽  
Impact Mechanism ◽  
Media Attention ◽  
Intermediary Role ◽  
The Impact

This paper selects domestic A-share listed companies from 2010 to 2019 as the research sample, and makes an empirical analysis on the impact mechanism of green technology innovation and enterprise performance, as well as the intermediary role of media attention. It is found that green technology innovation has a significant promoting effect on enterprise performance, and green technology innovation also has a significant promoting effect on media attention, which plays a significant intermediary role between green technology innovation and enterprise performance.

scholarly journals Team Mindfulness and Employee Moral Efficacy: The Moderating Effect of Team Bottom-Line Mentality

2021 ◽  
Vol 257 ◽  
pp. 02088
Author(s):  
Yang Li ◽  
Han Ren
Keyword(s):  
Positive Relationship ◽  
Bottom Line ◽  
Impact Mechanism ◽  
Individual Level ◽  
The Individual ◽  
The Impact ◽  
Moderating Role ◽  
Practical Implications ◽  
Moral Efficacy

Different from the previous studies that mainly focused on the mindfulness at the individual level, this research explores the effect of team mindfulness on employee moral efficacy, and considers the influence of the interaction between team bottom-line mentality (BLM) and team mindfulness on employees’ moral efficacy. Results from three-wave surveys of 275 employees indicated that: the team BLM will weaken the positive relationship between team mindfulness and employees’ moral effectiveness. This research advances the current understandings of the influencing process between team mindfulness and employees’ moral efficacy by identifying the moderating role of team BLM, and casts the spotlight on the impact mechanism among team mindfulness, team BLM, and employees’ moral efficacy at the team level. Theoretical and practical implications are also discussed.

An Investigation on Grain Refinement Mechanism of Master Alloys Al-Ti, Al-TiC and Al-Ti-C Toward Pure Aluminum

2013 ◽  
Vol 652-654 ◽  
pp. 1072-1075 ◽  
Author(s):  
Wan Wu Ding ◽  
Jiang Tao Zhu ◽  
Wen Jun Zhao ◽  
Tian Dong Xia
Keyword(s):  
Grain Refinement ◽  
Heterogeneous Nucleation ◽  
Pure Aluminum ◽  
Grain Refining ◽  
Nucleation Effect ◽  
Commercially Pure ◽  
Master Alloys ◽  
Refinement Mechanism ◽  
Heat Preservation

The grain refining effects of Al-Ti, Al-TiC and Al-Ti-C master alloys on commercially pure aluminum were compared, and the grain refinement mechanism of TiAl3 and TiC among master alloys was discussed. The results show that: the grain refinement of the master alloys Al-TiC and Al-Ti toward pure aluminum mainly stems from the heterogeneous nucleation role of TiC and TiAl3 particles, but with the extension of heat preservation time of fused mass, its role of heterogeneous nucleation will decline due to dissolution of TiAl3 and aggregation and precipitation of TiC. The preferable grain refinement effects of Al-Ti-C master alloys toward pure aluminum are mainly due to the fact that when TiAl3 and TiC particles are acted commonly as heterogeneous nucleation particles, the heterogeneous nucleation effect of TiC particles will be enhanced because of the presence of TiAl3.

The Role of Lattice Misfit on Heterogeneous Nucleation of Pure Aluminum

2016 ◽  
Vol 47 (10) ◽  
pp. 5012-5022 ◽  
Author(s):  
L. Wang ◽  
L. Yang ◽  
D. Zhang ◽  
M. Xia ◽  
Y. Wang ◽  
...  
Keyword(s):  
Heterogeneous Nucleation ◽  
Pure Aluminum ◽  
Lattice Misfit

Intergroup Threat and Outgroup Attitudes

2013 ◽  
Vol 44 (5) ◽  
pp. 311-319 ◽  
Author(s):  
Marco Brambilla ◽  
David A. Butz
Keyword(s):  
Gay Men ◽  
Social Group ◽  
Welfare Recipients ◽  
Intergroup Attitudes ◽  
Social Policies ◽  
Intergroup Threat ◽  
Economic Threat ◽  
The Impact ◽  
General Climate

Two studies examined the impact of macrolevel symbolic threat on intergroup attitudes. In Study 1 (N = 71), participants exposed to a macrosymbolic threat (vs. nonsymbolic threat and neutral topic) reported less support toward social policies concerning gay men, an outgroup whose stereotypes implies a threat to values, but not toward welfare recipients, a social group whose stereotypes do not imply a threat to values. Study 2 (N = 78) showed that, whereas macrolevel symbolic threat led to less favorable attitudes toward gay men, macroeconomic threat led to less favorable attitudes toward Asians, an outgroup whose stereotypes imply an economic threat. These findings are discussed in terms of their implications for understanding the role of a general climate of threat in shaping intergroup attitudes.

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