24小时热门版块排行榜

返回列表

784214630

金虫 (小有名气)

应助: 0 (幼儿园)
金币: 1007.1
散金: 77
红花: 17
帖子: 255
在线: 193.4小时
虫号: 3446533
注册: 2014-09-28
专业: 金属材料的合金相、相变及

[交流] The processing of ultrafine-grained Mg tubes for biodegradable stents

An investigation was carried out on equal-channel angular pressing (ECAP) and extrusion processing of a
ZM21 Mg alloy to obtain an improved candidate material for the manufacturing of biodegradable Mg
stents. Ultrafine-grain size billets of the ZM21 alloy were obtained by two-stage ECAP aimed at achieving
an initial refining of the structure at 200 C and then reaching the submicrometer grain size range by lowering the processing temperature down to 150 C. The investigation revealed a significant improvement
in the properties of the ECAP-treated samples compared with the starting coarse-grained ZM21 alloy. The
0.2% yield strength rose from 180 to 340 MPa after 150 C ECAP processing, while maintaining a fairly
high tensile ductility. The ultrafine ZM21 alloy billets were then used for the extrusion of stent precursors
having the form of small-size tubes. The grain size after extrusion remained in the submicrometer range
while the hardness was revealed to be significantly higher than that of the coarse-grained ZM21 Mg alloy.
It was demonstrated that processing of biodegradable Mg stent having an ultrafine-grained microstructure by ECAP and low-temperature extrusion is feasible and that the obtained products feature promising
properties.

回复此楼

» 本帖附件资源列表

欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com
附件 1 : The_processing_of_ultrafine-grained_Mg_tubes_for_biodegradable_stents_(2).pdf

2015-09-29 12:38:30, 2.52 M

» 猜你喜欢

真水无香

1楼 2015-09-29 12:38:34

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

相关版块跳转我要订阅楼主 784214630 的主题更新

返回列表