La_(2)O_(3)掺杂方式对MR14板材性能的影响

Effect of La_(2)O_(3) doping methods on the properties of MR14 plates

La_(2)O_(3)在钼中可以细化晶粒尺寸,钉扎位错,提高钼的强度。铼可以降低钼的塑脆转变温度,提高强度和延伸性能。为了充分发挥La_(2)O_(3)的细晶强化作用,进一步提升MR14板材的性能,通过固固掺杂、固液还原掺杂和液液掺杂三种混粉工艺,研究了La_(2)O_(3)掺杂方式对MR14合金的性能影响。研究表明,固液还原掺杂和液液掺杂两种混粉方式,均可以细化晶粒,提高显微硬度和室温力学性能,且性能差异较小,伸长率比固固掺杂的板坯高50%。

La_(2)O_(3)can refine grain size,pin dislocations,and improve the strength of molybdenum.Rhenium can re-duce the ductile brittle transition temperature of molybdenum,improve its strength and elongation performance.In order to fully utilize the fine grain strengthening effect of La_(2)O_(3)and further improve the mechanical properties of MR14 sheet,this article studied the effect of La_(2)O_(3)doping methods on the properties of MR14 alloy through three powder mixing processes:solid solid doping,solid liquid reduction doping,and liquid liquid doping.Research has shown that both solid-liquid reduction doping and liquid-liquid doping can refine grain size,improve microhard-ness and room temperature mechanical properties,with small performance differences and a 50%higher elongation than solid-liquid doped plates.