Firstly, I would like to gratitude sincerely to our group, including Lizheng Yao, Jixiong Chen, Zining Dong, Yihao Fan, Wenhao He, Tianyu Li, Jinyang Zhou and Yicheng Zhu. Without the effort from them, the website would not be accomplished in such a short time. Thanks for everyone’s patience and hardworking.

Then I would like to thank all the teachers who giving help and advice for our webpages. It was our first time to get touch in this kind of task, so there are many incomplete places. However, with their criticism and guidance, we improved our work to a better one.

Finally, I would like to give my thank to Shenzhen Ruihua Titanium Metal Technology co. LTD. The materials sent to us help us not only have a close observation of the material, but have a more thorough study of the mechanism.

Generally speaking, although there is still something not so perfect, we all tried our best to complete. Hope you enjoy it!