Ukusetyenzwa kwePlastiki, okwakwaziwa ngokuba yinkqubo yokucofa, yindlela yokucubungula apho isinyithi okanye i-alloy material is plastically deformed phantsi kwesenzo samandla angaphandle ukufumana ubungakanani obufunwayo bemilo kunye nokusebenza.

Inkqubo yokulungisa iplastiki yahlulwe ibe yi-deformation ephambili kunye ne-deformation yesibini, kwaye i-deformation yokuqala yinto engenanto.

I-tungsten, i-molybdenum kunye ne-alloy strips yokudweba iveliswa nge-powder metallurgy method, eyisakhiwo esine-fine-grained, esingafuneki ukuba sipakishwe kwaye sifakwe, kwaye sinokuxhomekeke ngokuthe ngqo kwicandelo elikhethiweyo kunye nohlobo lomngxuma. Ukunyibilika kwe-arc kunye ne-electron beam yokunyibilika kwee-ingots ezinokwakheka okuziinkozo ezirhabaxa, kuyafuneka ukuba uqale ukhuphe okanye wenze into engenanto ukuze umelane nemeko yoxinzelelo lweendlela ezintathu ukuphepha ukwenzeka kweentanda zomda wengqolowa ukuze kuqhutyekwe phambili.

Iplastiki yezinto eziphathekayo yinqanaba lokuguqulwa kwezinto ngaphambi kokuphuka. Amandla kukukwazi kwezinto eziphathekayo ukuxhathisa i-deformation kunye nokuphuka. Ukuqina kubuchule bezinto eziphathekayo ukufunxa amandla ukusuka kwi-deformation yeplastiki ukuya kwi-fracture. I-Tungsten-molybdenum kunye ne-alloys yayo ithande ukuba namandla aphezulu, kodwa inamandla okuguqula iplastiki, okanye ayinakumelana nokuguqulwa kweplastiki phantsi kweemeko eziqhelekileyo, kwaye ibonise ubulukhuni kunye nokuqina.

1,iplastiki-brittle utshintsho lobushushu

I-brittleness kunye nokuziphatha kokuqina kwezinto eziphathekayo zitshintsha ngobushushu. Icocekile kwiqondo lokushisa leplastiki-brittle transition (DBTT), oko kukuthi, inokuthi ikhubazeke ngokweplastiki phantsi koxinzelelo oluphezulu ngaphezu kolu luhlu lweqondo lokushisa, ebonisa ubunzima obuhle. Iintlobo ezahlukeneyo zokuqhekeka kwe-brittle zivame ukwenzeka ngexesha lokuguqulwa kokulungiswa ngaphantsi kolu luhlu lobushushu. Iintsimbi ezahlukeneyo zinamaqondo obushushu ahlukeneyo eplastikhi-brittle, itungsten iqhelekile malunga ne-400 ° C, kwaye imolybdenum ikufuphi nobushushu begumbi. Iqondo lokushisa eliphezulu leplastiki-brittle utshintsho luphawu olubalulekileyo lwezinto eziphathekayo. Izinto ezichaphazela i-DBTT zizinto ezichaphazela i-brittle fracture. Naziphi na izinto ezikhuthaza ukonakala kwezinto ziya kwandisa i-DBTT. Amanyathelo okunciphisa i-DBTT kukoyisa i-brittleness kunye nokwanda. Amanyathelo okuqina.

Izinto ezichaphazela i-plastiki-brittle transition ubushushu bezinto bubunyulu, ubungakanani beenkozo, iqondo le-deformation, i-stress state kunye ne-alloying elements of the material.

I-2, iqondo lobushushu eliphantsi (okanye ubushushu begumbi) i-recrystallization brittleness

Izixhobo ze-tungsten kunye ne-molybdenum kwilizwe elihlaziyiweyo zibonisa iindlela zokuziphatha ezahlukileyo ngokupheleleyo ukusuka kwimizi-mveliso ecocekileyo ye-cubic yobhedu kunye nezixhobo ze-aluminiyam kwindawo yobushushu begumbi. Izinto zobhedu ezihlaziyiweyo kunye ne-annealed kunye ne-aluminiyam zenza i-equiaxed recrystallized grain structure, ene-equiaxed recrystallized structure, ene-plasticity yobushushu begumbi kwaye inokucutshungulwa ngokungacwangciswanga ibe yimathiriyeli kwiqondo lobushushu begumbi, kwaye i-tungsten kunye ne-molybdenum zibonisa ukuqaqadeka okunzima kubushushu begumbi emva kokwenziwa kwakhona kwekristale. Iintlobo ezahlukeneyo zokuqhekeka kwe-brittle ziveliswa ngokulula ngexesha lokucubungula kunye nokusetyenziswa.